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Hanspeter Piepho - One of the best experts on this subject based on the ideXlab platform.
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trends in mean performance and stability of winter wheat and winter rye yields in a long term series of Variety Trials
Field Crops Research, 2020Co-Authors: S Hadasch, F Laidig, Janna Macholdt, E Bonecke, Hanspeter PiephoAbstract:Abstract There is considerable interest in assessing genetic gain from breeding efforts, as well as trends from non-genetic sources such as climate change. Long-term data from official Variety Trials provide an ideal opportunity to do so. Whereas past work on the subject was mainly focussed on trends in mean performance, little attention has been paid to yield stability. The purpose of the present paper therefore is to provide a framework for assessing trends in stability and to exemplify this using long-term data from German Variety Trials. Specifically, trends in the mean and variance of winter wheat and winter rye yields associated with genotypic, spatial, and climatic covariates were investigated based on a long-term series of multi-environment Trials from 1983/1985 to 2016. Yield stability is assessed based on the variance of yield. For climatic covariates, trends were investigated using growth stage-specific covariates which were obtained by dividing the total growth period into five or ten growth stages within which covariates were aggregated. The analysis was done by linear mixed models and forward selection served to identify trends in mean and variance. Specifically, trends in the mean were selected based on a coefficient of determination, R 2 , while variance trends associated with a covariate were selected based on the change in variance attributable to the covariate. For spatial covariates, mean yield increased with the field capacity in up to one meter soil depth in case of rye. For both crops, mean yield was negatively affected by a deficit in available water during the development of vegetative parts while water deficit towards the end of the growth period was positively associated with mean yield. Trends were also selected accounting for interactions of climatic covariates and genotypic groups (wheat: quality type; rye: breeding type), revealing that R 2 generally increased when interactions were taken into account. The responses to covariates were similar for the different groups, meaning the increase in R 2 is mainly attributable to the main effects of the genotypic groups. Variance trends associated with the calendar year were identified for both crops, revealing yield variance slightly increased with time. Based on the selected model, a coefficient of variation was obtained for each year to assess relative yield stability, showing a decrease for wheat and an increase for rye.
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breeding progress environmental variation and correlation of winter wheat yield and quality traits in german official Variety Trials and on farm during 1983 2014
Theoretical and Applied Genetics, 2017Co-Authors: Friedrich Laidig, Thomas Drobek, Uwe Meyer, Hanspeter Piepho, Dirk Rentel, Alexandra HueskenAbstract:Key message Over the last 32 years, a large gain in grain yield (24 %) was achieved in official German Variety Trials, and despite considerable loss in protein concentration (−7.9 %), winter wheat baking quality was partially improved over the last 32 years. On-farm gain in grain yield (32 %) exceeded gain in Trials, but at yield level about 25 dt ha −1 lower. Breeding progress was very successfully transferred into both progress in grain yield and on-farm baking quality.
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analysis of series of Variety Trials with perennial crops
Grass and Forage Science, 2014Co-Authors: Hanspeter Piepho, T EcklAbstract:Field Trials with perennial crops give rise to repeated measurements taken on the same plot on several occasions. It is important to account for serial correlation among repeated measurements in such Trials. This study illustrates the use of mixed models for this purpose. We consider the analysis of Trials conducted at several locations and the combination of Trials with different starting years. A key issue in the analysis is the distinction between effects of calendar years, which are associated with external environmental variation, and harvest years, which represent internal yield formation processes of the perennial crop. Two methods of two-stage analysis are compared with single-stage analysis. It is shown that results of two-stage analysis are very similar to those of single-stage analysis, if serial correlation is properly taken into account. Program code for the MIXED procedure of the SAS system is given in an Appendix S1 for all considered cases.
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Dissecting genetic and non-genetic sources of long-term yield trend in German official Variety Trials
Theoretical and Applied Genetics, 2014Co-Authors: Hanspeter Piepho, Friedrich Laidig, Thomas Drobek, Uwe MeyerAbstract:Key message Long-term yield trends have genetic and non-genetic components which may be dissected by a linear mixed model with regression terms. Disease-resistance breakdown must be accounted for in the interpretation. Abstract Long-term yield trends of crop varieties may be studied to identify a genetic trend component due to breeding efforts and a non-genetic trend component due to advances in agronomic practices. Many such studies have been undertaken, and most of these inspect trends either by plotting means against years and/or by some kind of regression analysis based on such plots. Dissection of genetic and non-genetic trend components is a key challenge in such analyses. In the present paper, we consider mixed models with regression components for identifying different sources of trend. We pay particular attention to the effect of disease breakdown, which is shown to be confounded with long-term genetic and non-genetic trends, causing an over-estimation of genetic trends based on long-term yield trial data. The models are illustrated using German multi-environment trial data on yield, mildew and Septoria leaf blotch susceptibility for winter wheat and yield, mildew and net blotch susceptibility for spring barley.
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dissecting genetic and non genetic sources of long term yield trend in german official Variety Trials
Theoretical and Applied Genetics, 2014Co-Authors: Hanspeter Piepho, Friedrich Laidig, Thomas Drobek, Uwe MeyerAbstract:Key message Long-term yield trends have genetic and non-genetic components which may be dissected by a linear mixed model with regression terms. Disease-resistance breakdown must be accounted for in the interpretation.
Antonin Dreiseitl - One of the best experts on this subject based on the ideXlab platform.
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frequency of powdery mildew resistances in spring barley cultivars in czech Variety Trials
Plant protection science, 2018Co-Authors: Antonin DreiseitlAbstract:Dreiseitl A. (2012): Frequency of powdery mildew resistances in spring barley cultivars in Czech Variety Trials. Plant Protect. Sci., 48: 17–20. In 2006–2010, resistance to the powdery mildew pathogen was studied in 277 spring barley cultivars. They were represented by 54 cultivars in Czech official Variety Trials, of which 42 were foreign, and 223 cultivars in Variety Trials conducted by domestic breeding companies in that period. Sixty-eight domestic cultivars (28.8%) exhib ited heterogeneity in the examined trait, i.e. they were composed of lines with different resistances to powdery mildew. Thirteen known resistances were identified (Ab, Ar, HH, La, Ly, Mlo, Ri, Ro, Ru, Sp, St, Tu2 and We). The most frequent resistance was Mlo detected in 160 homogeneous cultivars (= 76.6%). The newly described resistance Ro was found in 13 cultivars. Frequency of other resistances was low (maximally 2.4%). Unknown resistances were found in 16 cultivars, in five of which they were effective to all used pathotypes of the patho gen. Research on cultivars possessing unknown resistances and registered heterogeneous cultivars continues.
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powdery mildew resistance of czech and slovak spring barley breeding lines in Variety Trials
Czech Journal of Genetics and Plant Breeding, 2018Co-Authors: Antonin DreiseitlAbstract:In 2001–2005, resistance to powdery mildew was studied in 227 Czech and Slovak breeding lines of spring barley included in the breeding station Trials or official Trials. Seventeen known resistances were identified (Al, Ar, At, HH, Kr, La, Ly, Mlo, N81, Ri, Ru, Sp, St, Tu, We, Mla21, and Mlp1). Unknown resistances were found in 11 breeding lines, in five of which resistance was effective against all used pathotypes of the pathogen. Besides the identified resistances, unknown resistances were detected in another three breeding lines. Sixty-five breeding lines (= 29%) exhibited heterogeneity in the examined trait, i.e. they are composed of components with different resistances to powdery mildew. Comparison of current results with the previous ones shows a considerable increase in the proportion of breeding lines carrying the resistance Mlo (72%), on the account of the resistances located at the Mla locus, particularly Ru. The examined set is characterised by a high proportion of breeding lines resistant to all used Czech pathotypes of the given pathogen (78%), however of low diversity in the resistance.
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Frequency of powdery mildew resistances in spring barley cultivars in Czech Variety Trials
Plant Protection Science, 2012Co-Authors: Antonin DreiseitlAbstract:In 2006–2010, resistance to the powdery mildew pathogen was studied in 277 spring barley cultivars. They were represented by 54 cultivars in Czech official Variety Trials, of which 42 were foreign, and 223 cultivars in Variety Trials conducted by domestic breeding companies in that period. Sixty-eight domestic cultivars (28.8%) exhibited heterogeneity in the examined trait, i.e. they were composed of lines with different resistances to powdery mildew. Thirteen known resistances were identified (Ab, Ar, HH, La, Ly, Mlo, Ri, Ro, Ru, Sp, St, Tu2 and We). The most frequent resistance was Mlo detected in 160 homogeneous cultivars (= 76.6%). The newly described resistance Ro was found in 13 cultivars. Frequency of other resistances was low (maximally 2.4%). Unknown resistances were found in 16 cultivars, in five of which they were effective to all used pathotypes of the pathogen. Research on cultivars possessing unknown resistances and registered heterogeneous cultivars continues.
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differences in powdery mildew epidemics in spring and winter barley based on 30 year Variety Trials
Annals of Applied Biology, 2011Co-Authors: Antonin DreiseitlAbstract:Information on disease severity assists greatly with making decisions about crop protection systems. However, there are no published long-term field Trials in different locations to determine the severity of individual diseases. National Trials that relate to the agronomic traits of varieties, including disease responses, are available. The current article describes the use of such data to determine disease severity based on official Czech Variety Trials. In total, 838 and 334 field Trials of spring and winter barley, respectively, conducted from 1976 to 2005, were analysed. To compare year to year powdery mildew severity, five parameters were used. Annual disease severity in both crops differed substantially, whereas similarity of the disease severity was rare. During the last 15 years, disease severity in spring barley was stable despite a rapid increase in the area of fully resistant spring barley varieties, particularly those with the gene mlo. During the period 1976-2005, the mean disease severity in winter barley accounted for 64.1% of the mean disease severity in spring barley. The effect of deployment of the resistance genes and growing areas of winter barley on the determined disease severity was analysed. The method described here allows easy comparisons to be made of disease severity among years, locations and different crops and diseases if similar scoring scales for disease infection evaluation are used.
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frequency of powdery mildew resistances in winter barley cultivars tested in domestic Variety Trials
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2011Co-Authors: Antonin DreiseitlAbstract:DREISEITL, A.: Frequency of powdery mildew resistances in winter barley cultivars tested in domestic Variety Trials. Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 3, pp. 23–28 In 2006–2010, resistance to the powdery mildew pathogen was studied in 225 winter barley cultivars of which 86 two-rowed and 139 six-rowed. The examined set included 59 cultivars tested in the offi cial Variety Trials and 166 cultivars in Variety Trials conducted by domestic breeding stations in that period. Thirteen known resistances were identifi ed (Ar, Bw, Dr2, Ha, HH, IM9, La, Ly, Ra, Ru, Sp, St and We). No resistance was found in one cultivar only. The most frequent resistance was Ra detected in 114 cultivars (= 50.7%). The resistance Bw was found in 54 cultivars (24.0%). Resistances typical for spring barley cultivars (Ly, Sp, Ru and We) were also frequent (4.0% to 23.6%). Unknown resistances were found in 20 cultivars, in nine of which they were eff ective to all used pathotypes of the pathogen. Thirty-six cultivars (16.0%) exhibited heterogeneity in the examined trait, i.e. they were mostly composed of lines with diff erent resistances. Research on cultivars possessing unknown resistances continues. Blumeria graminis f.sp. hordei, Hordeum vulgare, postulation of resistances, powdery mildew, winter barley
Lee J. Clark - One of the best experts on this subject based on the ideXlab platform.
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short staple Variety Trials in cochise county 1998
Cotton: A College of Agriculture Report, 1999Co-Authors: Lee J. ClarkAbstract:Variety Trials were grown at two locations and with two different sets of short staple varieties. One trial on the Robbs farm, north of Kansas Settlement, tested two acala varieties and the most promising advanced strain from New Mexico, two short seasoned varieties from SureGrow and one Australia Variety. The other trial on the Glenn Schmidt farm, in Kansas Settlement, tested seventeen upland varieties as part of the statewide testing program. The highest yielding Variety in the Robbs trial was SG 404 with SG 125 coming in second. In the Schmidt trial, FM 989, an Australian Variety that has performed well in Safford, had the highest yield, just over 2 bales per acre.
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short staple Variety Trials graham county 1998
Cotton: A College of Agriculture Report, 1999Co-Authors: Lee J. Clark, E W Carpenter, R WalserAbstract:Two replicated on-farm short staple Variety Trials were planted in 1998. Fifteen varieties were evaluated on both the Carpenter farm in Thatcher and the Colvin farm near Ft. Thomas. Several new varieties were planted in both studies, including 4 transgenic varieties: DP 90B, BXN 47, DP 90RR and Paymaster 1560BG, 2 varieties from Australia: FiberMax 989 and FiberMax 832, and seven other varieties seen for the first time. Two of the new varieties produced the highest yields; AgriPro 6101 and Phytogen 952 on the Carpenter and Colvin farms, respectively. Other agronomic data from the varieties and HVI values from the lint are also included in this report.
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Short Staple Variety Trials in Cochise County, 1993
1994Co-Authors: Lee J. ClarkAbstract:Variety Trials were grown at two locations and with two different sets of short staple varieties. One trial, north of Kansas Settlement, tested nine acalas and one rust resistant Variety from Mexico. The other trial, south of Kansas Settlement and east of Pearce, tested three acalas and nine upland varieties. Top yielding varieties were Maxxa, in the acala trial and DPL 2056 in the upland trial. Yields were lower than expected due to adverse weather conditions, including hail.
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grain sorghum Variety Trials in greenlee county 1991
Forage and Grain: A College of Agriculture Report, 1992Co-Authors: Lee J. ClarkAbstract:Nine grain sorghum hybrids were compared in replicated tests in two locations in the Duncan Virden valley. Four full season, four mid full season and one non specified experimental hybrids were included in the Trials. A new mid -full season hybrid, DeKalb 66, was the top yielding cultivar in the test with a yield of 9830 pounds per acre. It yielded about 700 pounds per acre more than the top yielding hybrid in the previous trial. The devastating effect of hail was seen as one of the tests was hailed on in mid season. Introduction These Trials were a continuation of the Trials held in 1990 (1) where the new mid -full season hybrids were compared against the traditional full season hybrids. Across the country the full season hybrids are being replaced with high yielding faster maturing cultivars. The three highest yielding hybrids were joined with six other hybrids in the test. Of particular interest were the three new mid -full season hybrids by DeKalb, Northrup King and Asgrow. Methods and Materials The nine grain sorghum hybrids were compared in two locations picked at extreme ends of the DuncanVirden valley. One was located at the head of the valley, in Virden and the otherwas at the lower end of the valley in York. Both tests were full sized field tests with four replications. The farmer-cooperator's equipment was used for planting and all the cultural practices. Both fields were harvested by the same custom harvester. Plots were weighed in the field using an electronic weighwagon and percent moisture and bushel weights determined at the site. Plant heights and populations were measured just prior to harvest. Crop histories of the two sites are shown below: Crop History (field 1) Cooperator: Stan Jones, Virden Soil type: Pima silty loam Elevation: 3650 above sea level Planting date: 3 May 1991 Rate: 8.75 lbs per acre Fertilizer: 150 lb /ac 11 -52 -0 preplant 200 lbs of NH3 applied later Herbicide: Banvel Insecticide: Parathion once for greenbugs Irrigation: By furrow every other row Harvest: 27 November
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short and long staple Variety Trials greenlee county 1989
Cotton: A College of Agriculture Report, 1990Co-Authors: Lee J. ClarkAbstract:Two short staple and one long staple Variety Trials were implemented in Greenlee County in 1989, with new varieties topping each trial. The most exciting new discovery was HS 46, which topped the competition in the shortstaple trial by nearly 200 pounds of lint per acre. In the acala trial, the top four entries were composed of three New Mexico experimentals and Prema from the San Joaquin Valley. Any one of these acalas could become the new standard for the valley. P -69 in the long staple cotton trial yielded over 850 pounds of lintper acre and topped the S -6 yield by 25%. The testing program in Greenlee County is not only of benefit to the cotton producers and related agribusinesses in southeastern Arizona, but also to southwestern New Mexico. INTRODUCTION These Variety Trials are a continuation of the Variety testing that has taken place over the past several years. One trial is reserved for cotton varieties that produce a quality equivalent to or exceeding that of the New Mexico acalas, in fact the majority of the varieties tested are from New Mexico. At a second location, low micronaire is the problem to be dealt with, hence varieties that will produce well and have an acceptable micronaire value are tested there. The long staple Variety test is very dependent on the seed available from Ed Turcotte's, Pima development program. MATERIALS AND METHODS The three Variety Trials were grown in three different areas in the Duncan valley, with the acalas grown at the top of the valley in Virden, the Pimas grown in the center of the valley near Duncan and the short -staple varieties in York Valley at the northwest end of the farming valley. Each plot was planted using the cooperating farmers' equipment and their management practices. With the exception of the Pima trial, varieties were planted in tworow plots and were replicated, two to four times. Plots were weighed individually on trailer scales or with a basket scale. Subsamples were taken for lint analysis. For ease of reading, the three locations will be treated separately in this report with their own crop histories and results and discussions. Crop History Location 1 (acala varieties) Location 1: Stan Jones Farm, Virden, NM Soil type: Pima clay loam Elevation: 3750 feet Previous crop: Cotton Planting date: 19 April 1989 Rate: 18 pounds per acre Herbicide: Treflan, preplant Fertilizer: 150 pounds of 11 -53 -0 per acre, preplant Irrigation: furrow irrigated, approximately 3 acre -feet Insecticide: None PIX: 1/2 pint Defoliation: None
Uwe Meyer - One of the best experts on this subject based on the ideXlab platform.
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breeding progress environmental variation and correlation of winter wheat yield and quality traits in german official Variety Trials and on farm during 1983 2014
Theoretical and Applied Genetics, 2017Co-Authors: Friedrich Laidig, Thomas Drobek, Uwe Meyer, Hanspeter Piepho, Dirk Rentel, Alexandra HueskenAbstract:Key message Over the last 32 years, a large gain in grain yield (24 %) was achieved in official German Variety Trials, and despite considerable loss in protein concentration (−7.9 %), winter wheat baking quality was partially improved over the last 32 years. On-farm gain in grain yield (32 %) exceeded gain in Trials, but at yield level about 25 dt ha −1 lower. Breeding progress was very successfully transferred into both progress in grain yield and on-farm baking quality.
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Dissecting genetic and non-genetic sources of long-term yield trend in German official Variety Trials
Theoretical and Applied Genetics, 2014Co-Authors: Hanspeter Piepho, Friedrich Laidig, Thomas Drobek, Uwe MeyerAbstract:Key message Long-term yield trends have genetic and non-genetic components which may be dissected by a linear mixed model with regression terms. Disease-resistance breakdown must be accounted for in the interpretation. Abstract Long-term yield trends of crop varieties may be studied to identify a genetic trend component due to breeding efforts and a non-genetic trend component due to advances in agronomic practices. Many such studies have been undertaken, and most of these inspect trends either by plotting means against years and/or by some kind of regression analysis based on such plots. Dissection of genetic and non-genetic trend components is a key challenge in such analyses. In the present paper, we consider mixed models with regression components for identifying different sources of trend. We pay particular attention to the effect of disease breakdown, which is shown to be confounded with long-term genetic and non-genetic trends, causing an over-estimation of genetic trends based on long-term yield trial data. The models are illustrated using German multi-environment trial data on yield, mildew and Septoria leaf blotch susceptibility for winter wheat and yield, mildew and net blotch susceptibility for spring barley.
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dissecting genetic and non genetic sources of long term yield trend in german official Variety Trials
Theoretical and Applied Genetics, 2014Co-Authors: Hanspeter Piepho, Friedrich Laidig, Thomas Drobek, Uwe MeyerAbstract:Key message Long-term yield trends have genetic and non-genetic components which may be dissected by a linear mixed model with regression terms. Disease-resistance breakdown must be accounted for in the interpretation.
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genotypic and environmental variability of yield for cultivars from 30 different crops in german official Variety Trials
Plant Breeding, 2008Co-Authors: Friedrich Laidig, Thomas Drobek, Uwe MeyerAbstract:Genotypic, environmental and genotype by environmental variability of 30 different crops was evaluated by estimating variance components from trial series in 16 years. Yield data from official German Variety Trials for cultivation and use (VCU) were analysed over the period from 1991 to 2006. The natural dominant part was pure environmental variation. Genotype, genotype by environment and plot error are smaller and of the same magnitude. Interaction of genotypes with locations is larger than with years. Compared with variance component estimates of crops from a study involving 16 crops from former West German VCU Trials between 1975 and 1986 overall variability of yielding performance was lower in the recent study for all components except for location. Precision of Variety comparisons over locations and years is higher in recent VCU trial systems when assuming equal dimensioning of testing resources. Lower values for genotype by environmental variances, especially for the genotype by year component lead to lower standard errors for Variety comparisons.
L. J. Clark - One of the best experts on this subject based on the ideXlab platform.
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Short Staple Variety Trials, Graham County, 1997
2020Co-Authors: L. J. ClarkAbstract:Two on farm, replicated short staple Variety demonstrations were planted in 1997. Twelve varieties were evaluated on the Carpenter farm in Central and on the Colvin farm in Eden. Several new varieties were planted in both studies, including 2 transgenic varieties, DP 35B and BXN 47, 2 varieties from Australia and four other varieties seen for the first time. DP 35B and Stoneville 474 were the highest yielding varieties in Central and the Australian Variety, IF 1003, had the highest yield in Eden with yields over 2 bales per acre. Other agronomic data from the varieties and 11111 values from the lint are also included in this report. Introduction This cotton Variety trial, similar to the previous year's studies, is part of state -wide Variety evaluation done in conjunction with Dr. Jeff Silvertooth and six seed companies. But, even more important, it is part of the ongoing Variety Trials conducted in the county for the benefit of local cotton growers. Materials and Methods The demonstrations were grown with the cooperation of Darin Carpenter in Central, at an elevation of 2900 feet, and Colvin Farms in Eden, at an elevation of 2800 feet, using their equipment and normal cultural practices. The two sites differ in elevation by about 100 feet with the Carpenter field being higher and generally warmer. The varieties were planted in 2 -row plots in four replications at the Carpenter site and 4 -row plots with three replicates on the Colvin site. Plots were mechanically picked using the cooperator's machines, with each plot being weighed separately using electronic weigh scales under cotton trailers. Sub -samples were taken to determine lint turnout and fiber quality. Crop History Carpenter farm Previous crop: -Soil type: Pima clay loam / Grabe clay loam Planting date: 17 April 1997 Rate: 26 pounds per acre Fertilizer: 30 gallons of 20 -10-0 side dressed late May Herbicide: None Insecticide: Irrigation: Furrow, 7 times Defoliation: Sodium chlorate Harvest dates: 1st Pick: 29 October 2nd Pick: Not taken Heat units (86/55) to 1st pick: 3786 Crop History Colvin farm Previous crop: Cotton
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short staple Variety Trials in cochise county 1997
Cotton: A College of Agriculture Report, 1998Co-Authors: L. J. ClarkAbstract:Variety Trials were grown at two locations and with two different sets of short staple varieties. One trial on the Robbs farm, north of Kansas Settlement, tested one acata Variety from New Mexico two varieties from Australia and SureGrow 125, the highest yielding Variety in Curry trial in 1996. The other trial on the Ed Curry farm, near Sunsites, tested twelve upland varieties as part of the statewide testing program. The highest yielding Variety in the Robbs trial was SG 125 with a yield approaching 1.7 bales per acre. In the Curry trial, SureGrow 404, the highest yielding Variety in the 1995 trial, had the highest yield approaching 2.5 bales per acre. Introduction Two Variety Trials were conducted in Cochise county this year, one made up primarily to compare the predominant acata Variety with other potential varieties in the area, to bea sister trial to the one in Greenlee county (reference 1), the other made up of varieties from six seed companies as a part of the statewide Variety testing program. Five of the varieties tested in the two Trials were new to the area. Materials and Methods The upland Variety trial was planted on a drip irrigated field on the Ed Curry farm north of Sunsites and the acala trial was planted on the Robbs farm north and east of Kansas Settlement. Both Trials were planted using the cooperators equipment and managed according to their cultural practices. The varieties were planted in two row, 38 inch row spacing plots on the Robbs farm with a 4X1 slip pattern and four tow 30 inchrow spacing plots on the Curry farm. There were four replicates on the Robbs farm and two replications on the Curry farm. The following crop histories provide details on how the fields were managedy -Robbs farm Previous crop: Lettuce Soil type: Karro-Elfrida sandy loam Planting date: 21 April 1997 Rate: 17 lbs /ac Fertilizer; 30 gal/ac 14-34 at planting + 20 gal/ac of UN32 in July Herbicide: Treflan pre: plant Insecticide: Thimet applied in the seed bed Fungicide: NOW Pix /Prep: Nom Defoliation: None Irrigation: Furrow irrigated, watered up + 4 -5 irrigations Harvest date: 7 November Heat units (86/55°F) to harvest: 3203 as calculated from data at the Bonita AZMET station. Crop History -Curry farm Previous crop: Chile pepper
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Short Staple Variety Trials in Cochise County, 1996
1997Co-Authors: L. J. ClarkAbstract:Variety Trials were grown at two locations and with two different sets of short staple varieties. One trial on the Robbs farm, north of Kansas Settlement, tested seven acalas varieties from New Mexico and California and one Variety from Australia. The other trial on the Noel Curry farm, near the town of Cochise, tested nine upland varieties as part of the statewide testing program and three acalas from NM and CA. The highest yielding Variety in our tests was SG 125 with a yield over 3 bales per acre. In the acala study, the Australian Variety and an experimental from NM were the highest yielding varieties with yields just over 2 bales per acre. Lint quality of each Variety and an estimated crop value are also given in this paper. Introduction Two Variety Trials were conducted in Cochise county this year, one made up primarily of acala varieties, to be a sister trial to the one in Greenlee county (reference 1), the other made up of varieties from five seed companies and New Mexico State University as a part of the statewide Variety testing program. Nearly half of the varieties tested in the two Trials were new to the area. Materials and Methods The upland Variety trial was planted on a furrow irrigated field on the Noel Curry farm southwest of Cochise and the acala trial was planted on the Robbs farm north and east of Kansas Settlement. Both Trials were planted using the cooperators equipment and managed according to their cultural practices. The varieties were planted in two row, 38 inch row spacing plots on the Robbs farm with a 4X1 skip pattern and four -row 30 inch row spacing plots on the Curry farm. There were four replicates on the Robbs farm and one replication on the Curry farm. The following crop histories provide details on how the fields were managed: Crop History Robbs farm Previous crop: Onions Soil type: Karro-Elfrida sandy loam Planting date: 12 April 1996 Rate: 21 lbs /ac Fertilizer: 80 lbs /ac of N sidedressed Herbicide: Treflan pre -plant Insecticide: Thimet applied in the seed bed Fungicide: None Pix/Prep: None Defoliation: None Irrigation: Furrow irrigated, watered up + 4 -5 irrigations Harvest date: 11 November Heat units (86/55 °F) to harvest: 3331 as calculated from data at the Bonita AZMET station. Crop History Curry farm Previous crop: Chile pepper Soil type: McAllister loam Planting date: 16 April 1996 Fertilizer: 150 lbs /ac 11 -53 -0 preplant Herbicide: Treflan pre -plant Insecticide: None Rate: 20 lbs /ac
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Short Staple Variety Trials in Cochise County, 1995
1996Co-Authors: L. J. ClarkAbstract:Variety Trials were grown at two locations and with two different sets of short staple varieties. One trial on the Robbs farm, north of Kansas Settlement, tested eight acalas varieties from New Mexico and California. The other trial on the Curry farm, southwest of Kansas Settlement and north of Sunsites, tested twelve upland varieties as part of the statewide testing program. The latter trial was grown under drip irrigation.
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Short Staple Variety Trials in Cochise County, 1994
1995Co-Authors: L. J. Clark, E W CarpenterAbstract:Variety Trials were grown at two locations and with two different sets of short staple varieties. One dial on the Robbs farm, north of Kansas Settlement, tested eight acolas varieties from New Mexico and California. The other trial on the Curry farm, southwest of Kansas Settlement and north of Sunsites, tested twelve upland varieties as part of the statewide testing program. The latter trial was grown under drip irrigation. Yields were exceptionally high at these high elevation Trials due to the record breaking heat experienced during the summer. Top yielding varieties were Prema in the acala trial and DP 5409 in the upland trial with lint yields of 892 and 1791 pounds per acre, respectively. Introduction Two Variety Trials were conducted in Cochise county this year, one made up primarily of acala varieties, to be a sister trial to the one in Greenlee county (reference 1), the other made up of varieties from the six seed companies that sponsored Variety testing across the state. All of the varieties in the acala trial had been tested in previous Trials, whereas in the upland trial, most of the varieties were new to the area. Materials and Methods The upland Variety trial was planted on a drip irrigation field on the Ed Curry farm just north of Sunsites and the acala trial was planted on the Robbs farm north and east of Kansas Settlement. Both Trials were planted using the cooperators equipment and managed according to their cultural practices. The Robbs field was planted using a 2:1 skip pattern. The varieties were planted in two row plots the full length of the respective fields, with two replications being harvested. The following crop histories provide details on how the fields were managed: Crop History Curry farm Previous crop: Fallow Soil type: Tubac sandy clay loam Planting date: 22 April 1994 Rate: 26 lbs /ac Fertilizer: 30 gal /ac of UN32 applied through the drip (equally divided into 3 applications) [ 106 lbs of N /ac] Herbicide: Treflan pre-plant Insecticide: None Fungicide: None Pix /Prep: None Defoliation: None Irrigation: Drip tape every other furrow (60" centers), ca. 20 acre inches of water Harvest date: 2 December
