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Tomas Rydberg - One of the best experts on this subject based on the ideXlab platform.
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Crop Yield in swedish experiments with shallow tillage and no tillage 1983 2012
European Journal of Agronomy, 2014Co-Authors: Johan Arvidsson, Ararso Etana, Tomas RydbergAbstract:Abstract Crop Yield data from 918 experimental years with shallow (5–10 cm) non-inversion tillage and 226 experimental years with no-tillage conducted in the period 1983–2012 were analysed, especially regarding effects of Crop, preceding Crop, soil type and duration of tillage system. For all experiments with shallow tillage, Crop Yield was 1.8% lower than for mouldboard ploughing. Yield of spring cereals and spring oilseed rape (Brassica napus L.) was similar for the two systems, while Yield of peas (Pisum vulgare L.), sugar beet (Beta vulgaris L.), potatoes (Solanum tuberosum L.) and winter oilseed rape (Brassica napus L.) was 5–10% lower for shallow tillage. Winter wheat (Triticum aestivum L.) Yield in particular was much affected by preceding Crop, with lower relative Yield for shallow tillage with cereal as the preceding Crop. For no-tillage, relative Yield was on average 9.8% lower than for mouldboard ploughing, with the greatest Yield losses for spring-sown Crops. Plant establishment was similar for shallow tillage and mouldboard ploughing, but lower with no-tillage. There was no obvious trend in Crop Yield over time in long-term experiments with shallow tillage, indicating that in terms of Crop Yield, primary tillage systems can be chosen depending on the conditions in a specific year. The results indicate that compaction in reduced tillage under Swedish conditions was a minor problem for cereals, whereas dicots were more sensitive to compaction. The major problems in reduced tillage were caused by plant residues and, in no-tillage, by poor establishment due to the lack of a seedbed. Overall, the results show that under Swedish climate conditions, shallow tillage can give similar Yields to mouldboard ploughing. For no-tillage, the system has to be improved to secure plant establishment and Crop Yield.
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Crop Yield in Swedish experiments with shallow tillage and no-tillage 1983–2012
European Journal of Agronomy, 2014Co-Authors: Johan Arvidsson, Ararso Etana, Tomas RydbergAbstract:Abstract Crop Yield data from 918 experimental years with shallow (5–10 cm) non-inversion tillage and 226 experimental years with no-tillage conducted in the period 1983–2012 were analysed, especially regarding effects of Crop, preceding Crop, soil type and duration of tillage system. For all experiments with shallow tillage, Crop Yield was 1.8% lower than for mouldboard ploughing. Yield of spring cereals and spring oilseed rape (Brassica napus L.) was similar for the two systems, while Yield of peas (Pisum vulgare L.), sugar beet (Beta vulgaris L.), potatoes (Solanum tuberosum L.) and winter oilseed rape (Brassica napus L.) was 5–10% lower for shallow tillage. Winter wheat (Triticum aestivum L.) Yield in particular was much affected by preceding Crop, with lower relative Yield for shallow tillage with cereal as the preceding Crop. For no-tillage, relative Yield was on average 9.8% lower than for mouldboard ploughing, with the greatest Yield losses for spring-sown Crops. Plant establishment was similar for shallow tillage and mouldboard ploughing, but lower with no-tillage. There was no obvious trend in Crop Yield over time in long-term experiments with shallow tillage, indicating that in terms of Crop Yield, primary tillage systems can be chosen depending on the conditions in a specific year. The results indicate that compaction in reduced tillage under Swedish conditions was a minor problem for cereals, whereas dicots were more sensitive to compaction. The major problems in reduced tillage were caused by plant residues and, in no-tillage, by poor establishment due to the lack of a seedbed. Overall, the results show that under Swedish climate conditions, shallow tillage can give similar Yields to mouldboard ploughing. For no-tillage, the system has to be improved to secure plant establishment and Crop Yield.
Johan Arvidsson - One of the best experts on this subject based on the ideXlab platform.
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Crop Yield in swedish experiments with shallow tillage and no tillage 1983 2012
European Journal of Agronomy, 2014Co-Authors: Johan Arvidsson, Ararso Etana, Tomas RydbergAbstract:Abstract Crop Yield data from 918 experimental years with shallow (5–10 cm) non-inversion tillage and 226 experimental years with no-tillage conducted in the period 1983–2012 were analysed, especially regarding effects of Crop, preceding Crop, soil type and duration of tillage system. For all experiments with shallow tillage, Crop Yield was 1.8% lower than for mouldboard ploughing. Yield of spring cereals and spring oilseed rape (Brassica napus L.) was similar for the two systems, while Yield of peas (Pisum vulgare L.), sugar beet (Beta vulgaris L.), potatoes (Solanum tuberosum L.) and winter oilseed rape (Brassica napus L.) was 5–10% lower for shallow tillage. Winter wheat (Triticum aestivum L.) Yield in particular was much affected by preceding Crop, with lower relative Yield for shallow tillage with cereal as the preceding Crop. For no-tillage, relative Yield was on average 9.8% lower than for mouldboard ploughing, with the greatest Yield losses for spring-sown Crops. Plant establishment was similar for shallow tillage and mouldboard ploughing, but lower with no-tillage. There was no obvious trend in Crop Yield over time in long-term experiments with shallow tillage, indicating that in terms of Crop Yield, primary tillage systems can be chosen depending on the conditions in a specific year. The results indicate that compaction in reduced tillage under Swedish conditions was a minor problem for cereals, whereas dicots were more sensitive to compaction. The major problems in reduced tillage were caused by plant residues and, in no-tillage, by poor establishment due to the lack of a seedbed. Overall, the results show that under Swedish climate conditions, shallow tillage can give similar Yields to mouldboard ploughing. For no-tillage, the system has to be improved to secure plant establishment and Crop Yield.
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Crop Yield in Swedish experiments with shallow tillage and no-tillage 1983–2012
European Journal of Agronomy, 2014Co-Authors: Johan Arvidsson, Ararso Etana, Tomas RydbergAbstract:Abstract Crop Yield data from 918 experimental years with shallow (5–10 cm) non-inversion tillage and 226 experimental years with no-tillage conducted in the period 1983–2012 were analysed, especially regarding effects of Crop, preceding Crop, soil type and duration of tillage system. For all experiments with shallow tillage, Crop Yield was 1.8% lower than for mouldboard ploughing. Yield of spring cereals and spring oilseed rape (Brassica napus L.) was similar for the two systems, while Yield of peas (Pisum vulgare L.), sugar beet (Beta vulgaris L.), potatoes (Solanum tuberosum L.) and winter oilseed rape (Brassica napus L.) was 5–10% lower for shallow tillage. Winter wheat (Triticum aestivum L.) Yield in particular was much affected by preceding Crop, with lower relative Yield for shallow tillage with cereal as the preceding Crop. For no-tillage, relative Yield was on average 9.8% lower than for mouldboard ploughing, with the greatest Yield losses for spring-sown Crops. Plant establishment was similar for shallow tillage and mouldboard ploughing, but lower with no-tillage. There was no obvious trend in Crop Yield over time in long-term experiments with shallow tillage, indicating that in terms of Crop Yield, primary tillage systems can be chosen depending on the conditions in a specific year. The results indicate that compaction in reduced tillage under Swedish conditions was a minor problem for cereals, whereas dicots were more sensitive to compaction. The major problems in reduced tillage were caused by plant residues and, in no-tillage, by poor establishment due to the lack of a seedbed. Overall, the results show that under Swedish climate conditions, shallow tillage can give similar Yields to mouldboard ploughing. For no-tillage, the system has to be improved to secure plant establishment and Crop Yield.
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a model for estimating Crop Yield losses caused by soil compaction
Soil & Tillage Research, 1991Co-Authors: Johan Arvidsson, Inge HakanssonAbstract:A computerized empirical model for estimating the Crop Yield losses caused by machinery-induced soil compaction and the value of various countermeasures is presented, along with some examples of estimations made with it. The model is based mainly on results of Swedish field trials, and predicts the effects of compaction in a tillage system that includes mouldboard ploughing. It is designed for use at farm level and predicts four categories of effects: (1) Effects of recompaction after ploughing. The calculations are based on the wheel track distribution in the field and the relationship between “degree of compactness” of the plough layer and Crop Yield. (2) Effects of plough layer compaction persisting after ploughing. Crop Yield losses are estimated from traffic intensity in Mgkm ha−1 (Mgkm = the product of the weight of a machine and the distance driven), soil moisture content, tyre inflation pressure and clay content. (3) Effects of subsoil compaction. The calculations are similar to those presented under point (2), but only vehicles with high axle load are considered. These effects are the most persistent. (4) Effects of traffic in ley Crops. The estimations are based on wheel track distribution, soil moisture content and several other factors.
Ararso Etana - One of the best experts on this subject based on the ideXlab platform.
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Crop Yield in swedish experiments with shallow tillage and no tillage 1983 2012
European Journal of Agronomy, 2014Co-Authors: Johan Arvidsson, Ararso Etana, Tomas RydbergAbstract:Abstract Crop Yield data from 918 experimental years with shallow (5–10 cm) non-inversion tillage and 226 experimental years with no-tillage conducted in the period 1983–2012 were analysed, especially regarding effects of Crop, preceding Crop, soil type and duration of tillage system. For all experiments with shallow tillage, Crop Yield was 1.8% lower than for mouldboard ploughing. Yield of spring cereals and spring oilseed rape (Brassica napus L.) was similar for the two systems, while Yield of peas (Pisum vulgare L.), sugar beet (Beta vulgaris L.), potatoes (Solanum tuberosum L.) and winter oilseed rape (Brassica napus L.) was 5–10% lower for shallow tillage. Winter wheat (Triticum aestivum L.) Yield in particular was much affected by preceding Crop, with lower relative Yield for shallow tillage with cereal as the preceding Crop. For no-tillage, relative Yield was on average 9.8% lower than for mouldboard ploughing, with the greatest Yield losses for spring-sown Crops. Plant establishment was similar for shallow tillage and mouldboard ploughing, but lower with no-tillage. There was no obvious trend in Crop Yield over time in long-term experiments with shallow tillage, indicating that in terms of Crop Yield, primary tillage systems can be chosen depending on the conditions in a specific year. The results indicate that compaction in reduced tillage under Swedish conditions was a minor problem for cereals, whereas dicots were more sensitive to compaction. The major problems in reduced tillage were caused by plant residues and, in no-tillage, by poor establishment due to the lack of a seedbed. Overall, the results show that under Swedish climate conditions, shallow tillage can give similar Yields to mouldboard ploughing. For no-tillage, the system has to be improved to secure plant establishment and Crop Yield.
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Crop Yield in Swedish experiments with shallow tillage and no-tillage 1983–2012
European Journal of Agronomy, 2014Co-Authors: Johan Arvidsson, Ararso Etana, Tomas RydbergAbstract:Abstract Crop Yield data from 918 experimental years with shallow (5–10 cm) non-inversion tillage and 226 experimental years with no-tillage conducted in the period 1983–2012 were analysed, especially regarding effects of Crop, preceding Crop, soil type and duration of tillage system. For all experiments with shallow tillage, Crop Yield was 1.8% lower than for mouldboard ploughing. Yield of spring cereals and spring oilseed rape (Brassica napus L.) was similar for the two systems, while Yield of peas (Pisum vulgare L.), sugar beet (Beta vulgaris L.), potatoes (Solanum tuberosum L.) and winter oilseed rape (Brassica napus L.) was 5–10% lower for shallow tillage. Winter wheat (Triticum aestivum L.) Yield in particular was much affected by preceding Crop, with lower relative Yield for shallow tillage with cereal as the preceding Crop. For no-tillage, relative Yield was on average 9.8% lower than for mouldboard ploughing, with the greatest Yield losses for spring-sown Crops. Plant establishment was similar for shallow tillage and mouldboard ploughing, but lower with no-tillage. There was no obvious trend in Crop Yield over time in long-term experiments with shallow tillage, indicating that in terms of Crop Yield, primary tillage systems can be chosen depending on the conditions in a specific year. The results indicate that compaction in reduced tillage under Swedish conditions was a minor problem for cereals, whereas dicots were more sensitive to compaction. The major problems in reduced tillage were caused by plant residues and, in no-tillage, by poor establishment due to the lack of a seedbed. Overall, the results show that under Swedish climate conditions, shallow tillage can give similar Yields to mouldboard ploughing. For no-tillage, the system has to be improved to secure plant establishment and Crop Yield.
Chenghai Yang - One of the best experts on this subject based on the ideXlab platform.
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Hyperspectral Imagery for Mapping Crop Yield for Precision Agriculture
Food Engineering Series, 2015Co-Authors: Chenghai YangAbstract:Crop Yield is one of the most important pieces of information for Crop management in precision agriculture. It integrates the effects of various spatial variables such as soil properties, topographic attributes, tillage, plant population, fertilization, irrigation, and pest infestations. A Yield map can therefore be an indispensable input for variable rate application either by itself or in combination with other spatial information. Imagery from traditional satellite systems, such as the U.S. Landsat satellites and the French SPOT satellites, has long been used to monitor Crop growing conditions and to estimate Crop Yields over large geographic areas. However, this type of imagery has limited use for assessing within-field Yield variability because of its coarse spatial resolution, long repeat cycles, and slow data delivery. Therefore, airborne multispectral and hyperspectral imaging systems have been more widely used for assessing within-field Crop growth and Yield variation. Remote sensing imagery obtained during the growing season has potential not only for after-season management, but also for within-season management. This chapter presents a brief overview of high resolution remote sensing imagery for mapping Crop Yield variability and illustrates how airborne hyperspectral imagery can be used for Crop Yield estimation based on different methods. Research results have demonstrated that hyperspectral imagery can be useful for estimating and mapping within-field Crop Yield variability for precision agriculture.
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Unsupervised linear unmixing of hyperspectral image for Crop Yield estimation
2010Co-Authors: Bin Luo, Chenghai Yang, Jocelyn ChanussotAbstract:Multispectral and hyperspectral imagery are often used for estimating Crop Yield. This paper describes an unsupervised unmixing scheme of hyperspectral images on field in order to estimate the Crop Yield. From the hyperspectral images, the endmembers and their abundance maps are computed by unsupervised unmixing. The abundance maps are then compared with the Crop Yield data. The results show the capability for estimating Crop Yield of the unmixing scheme, thanks to the high correlations between the Crop Yield data and the abundance maps of the endmembers corresponding to Crop, even though the scheme is totally unsupervised.
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IGARSS - Unsupervised linear unmixing of hyperspectral image for Crop Yield estimation
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010Co-Authors: Bin Luo, Chenghai Yang, Jocelyn ChanussotAbstract:Multispectral and hyperspectral imagery are often used for estimating Crop Yield. This paper describes an unsupervised unmixing scheme of hyperspectral images on field in order to estimate the Crop Yield. From the hyperspectral images, the endmembers and their abundance maps are computed by unsupervised unmixing. The abundance maps are then compared with the Crop Yield data. The results show the capability for estimating Crop Yield of the unmixing scheme, thanks to the high correlations between the Crop Yield data and the abundance maps of the endmembers corresponding to Crop, even though the scheme is totally unsupervised.
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Airborne Hyperspectral Imagery for Mapping Crop Yield Variability
Geography Compass, 2009Co-Authors: Chenghai YangAbstract:Information concerning the spatial variation in Crop Yield has become necessary for site-specific Crop management. Traditional satellite imagery has long been used to monitor Crop growing conditions and to estimate Crop Yields over large geographic areas. However, this type of imagery has limited use for assessing within-field Yield variability because of its coarse spatial resolution. Therefore, high-resolution airborne multispectral and hyperspectral imagery has been used for this purpose. This study presents an overview on the use of remote sensing imagery for mapping Crop Yield variability and illustrates how airborne hyperspectral imagery can be used for Crop Yield estimation based on the work conducted at the US Department of Agriculture’s Kika de la Garza Subtropical Agricultural Research Center at Weslaco, Texas. Some of the challenges and considerations on the use of hyperspectral imagery for Yield mapping are discussed.
T. Negre - One of the best experts on this subject based on the ideXlab platform.
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Real-time agrometeorological Crop Yield monitoring in Eastern Africa
Agronomy for Sustainable Development, 2005Co-Authors: O. Rojas, F. Rembold, A. Royer, T. NegreAbstract:The Joint Research Centre (JRC), in collaboration with the Food Agriculture Organization (FAO), has developed for East Africa an operational Crop Yield monitoring and forecasting system (CYMFS). The CYMFS integrates into a Geographical Information System (GIS): the meteorological information of the European Centre for Medium-Range Weather Forecast (ECMWF), the Crop-Specific Water Balance (CSWB) model, and the Crop Production System Zones database (CPSZ). Additional and independent real-time satellite data from SPOT VEGETATION were analyzed using a specific Crop mask to concentrate the analysis only on agricultural areas. This approach gives to the food analyst a qualitative picture of Crop Yield expectation for rain-fed Crops at different stages of the growing season. The proposed methodology was applied to the first Crop season of 2001 and 2002 and demonstrated a clear potential in Crop monitoring and Yield forecasting. The results obtained during the extremely dry year of 2002 proved that the Crop monitoring system was timely and geographically precise. A new Crop cycle progress index (CCPI) was developed to take into consideration the agro-ecological heterogeneity of the region.