The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
C S Tan - One of the best experts on this subject based on the ideXlab platform.
-
The effect of water table management on water quality under Sandy Loam and clay Loam soils at the farm scale
2012 Dallas Texas July 29 - August 1 2012, 2012Co-Authors: C S Tan, T Q ZhangAbstract:The water table management systems on agricultural primary nutrients of NO3 -N, TP and K were investigated on three large field sites (a Sandy Loam site and two clay Loam sites, one with no tillage and the other with conventional tillage) located in Southwestern Ontario. The investigation was conducted over a period from May 8, 1995 to July 14, 1998. The purpose of this investigation was to compare tile drainage volume, nutrient mean concentration and nutrient loss between water table control treatments (i.e. controlled drainage with subirrigation-CDS or controlled drainage only-CD) and the free drainage treatment (FD). The results of this study showed that both CDS and CD treatments produced less tile drainage volume compared with FD treatment. At the Sandy Loam site, the CDS treatment produced less tile drainage volume by 5.3% compared with FD treatment. At the clay Loam sites of conventional tillage and no tillage respectively, the CD treatment produced less tile drainage volume by 12.2% and 2.9% compared with FD treatment. Both CDS and CD treatments promoted reduction of NO3 -N mean concentration, respectively by 38.6%, 13.1% and 12.8% at the Sandy Loam site and at the clay Loam sites of conventional tillage and no tillage compared with FD treatment over the study period. Contrary, both CDS and CD treatments promoted increase in K mean concentration by 40.6%, 19.2% and 11.6 % respectively, at the Sandy Loam site and clay Loam sites of conventional tillage and no tillage compared with FD treatment. The CD treatment reduced TP mean concentration marginally at conventional tillage site by 6.9% and at no tillage site by 1.3%, while at the Sandy Loam site the CDS treatment increased TP mean concentration by 21.9% compared with the FD treatment. Both CDS and CD treatments reduced NO3 -N and TP loss respectively, by 13.4% and 6.7% at the Sandy Loam site, by 13.2% and 7.1% at conventional tillage site and by 16.3% and 25% at no tillage site compared with FD treatment. In contrast, both CDS and CD treatments increased K loss at the Sandy soil site and at the clay Loam sites of conventional tillage and no tillage, respectively by 5.2%, 5.5% and 28.1% compared with FD treatment.
-
Effect of soil compaction on growth, yield and root rots of white beans in clay Loam and Sandy Loam soil
Soil Biology and Biochemistry, 1991Co-Authors: C S TanAbstract:The effect of soil compaction on plant growth, yield and root rot severity of white beans was investigated in Sandy Loam (Harrow) and clay Loam (Chatham) soils between 1983 and 1985. The root rots were mainly Rhizoctonia solani (Rs) and F. solani f. sp. phaseoli (Fs). The ratios of Rs to Fs in infected root pieces were 10:6 and 10:4 in Harrow and Chatham locations, respectively. There were significant reductions in root and shoot biomass and yield, and an increase in root rot severity as soil compaction increased. At the same degree of soil compaction, plants grew better and yielded more in clay Loam than in Sandy Loam. The relationships between soil compaction and other soil environmental factors such as water, aeration and temperature are discussed.
Changyoon Jeong - One of the best experts on this subject based on the ideXlab platform.
-
effect of biochar amendment on sorption desorption and dissipation of 17α ethinylestradiol in Sandy Loam and clay soils
Science of The Total Environment, 2019Co-Authors: Zhuo Wei, Jim J Wang, Amy B Hernandez, Andrea Warren, Jonghwan Park, Yili Meng, Syam K Dodla, Changyoon JeongAbstract:Animal manure application in agricultural land has caused the release of steroid estrogens in the soil environment and further movement to aquatic systems. The objective of this study was to investigate the effects of biochar addition on sorption-desorption and dissipation behaviors of 17α‑ethinylestradiol (EE2) in two different textured soils. A Commerce Sandy Loam and a Shakey clay were selected and subjected to sterilization. Soil samples with and without sterilization were reacted with a series of EE2 solutions of different concentrations for sorption followed by desorption and quantification using HPLC-MS/MS. Long-term dissipation of EE2 in the same soils was also evaluated over a 30-d incubation. Biochar amendment increased the maximum EE2 sorption capacity but decreased its water desorption in both Sandy Loam and clay soils. On other hand, biochar addition increased the Koc in the clay soil which had low EE2 sorption efficiency but decreased Koc in the Sandy Loam which had high EE2 sorption efficiency. Biochar did significantly increase both desorbable and non-extractable fractions of EE2, while it reduced the bioavailability of EE2 to microbial degradation. The dissipation of EE2 in non-sterilized soils fit to the first-order kinetic model, whereas it was better described by zero-order kinetic for sterilized soil. Biochar increased the half-life of EE2 dissipation in non-sterilized Commerce Sandy Loam soil by 48% (from 3.63 to 5.37 d) and in non-sterilized Sharkey clay soil by 67% (from 2.28 to 3.81 d). Overall, this study demonstrated positive impacts of biochar on the retention of estrogen hormones in soils.
-
Effect of biochar amendment on sorption-desorption and dissipation of 17α‑ethinylestradiol in Sandy Loam and clay soils.
The Science of the total environment, 2019Co-Authors: Zhuo Wei, Jim J Wang, Amy B Hernandez, Andrea Warren, Jonghwan Park, Yili Meng, Syam K Dodla, Changyoon JeongAbstract:Animal manure application in agricultural land has caused the release of steroid estrogens in the soil environment and further movement to aquatic systems. The objective of this study was to investigate the effects of biochar addition on sorption-desorption and dissipation behaviors of 17α‑ethinylestradiol (EE2) in two different textured soils. A Commerce Sandy Loam and a Shakey clay were selected and subjected to sterilization. Soil samples with and without sterilization were reacted with a series of EE2 solutions of different concentrations for sorption followed by desorption and quantification using HPLC-MS/MS. Long-term dissipation of EE2 in the same soils was also evaluated over a 30-d incubation. Biochar amendment increased the maximum EE2 sorption capacity but decreased its water desorption in both Sandy Loam and clay soils. On other hand, biochar addition increased the Koc in the clay soil which had low EE2 sorption efficiency but decreased Koc in the Sandy Loam which had high EE2 sorption efficiency. Biochar did significantly increase both desorbable and non-extractable fractions of EE2, while it reduced the bioavailability of EE2 to microbial degradation. The dissipation of EE2 in non-sterilized soils fit to the first-order kinetic model, whereas it was better described by zero-order kinetic for sterilized soil. Biochar increased the half-life of EE2 dissipation in non-sterilized Commerce Sandy Loam soil by 48% (from 3.63 to 5.37 d) and in non-sterilized Sharkey clay soil by 67% (from 2.28 to 3.81 d). Overall, this study demonstrated positive impacts of biochar on the retention of estrogen hormones in soils.
Todd A. Anderson - One of the best experts on this subject based on the ideXlab platform.
-
Sorption of estrogens, triclosan, and caffeine in a Sandy Loam and a silt Loam soil
Journal of Soils and Sediments, 2010Co-Authors: Adcharee Karnjanapiboonwong, Audra Morse, Jonathan D. Maul, Todd A. AndersonAbstract:Recently, pharmaceuticals and personal care products (PPCPs) have been identified in the environment. Concerns on the occurrence and fate of these compounds in soil and sediment have significantly increased. It is believed that these PPCPs sorb to soil and sediment; however, information on sorption of PPCPs is still limited. In this study, the sorption of estrone (E1), 17β-estradiol (E2), estriol (E3), 17α-ethynylestradiol (EE2), triclosan, and caffeine to two Loam soils and Ottawa sand was assessed. Sorption was determined using the batch equilibrium method. Freundlich and linear equations were applied to the sorption data in order to obtain sorption isotherms for each test compound and the respective sorption coefficients (K f, K d, and log K oc). The results indicated that isotherms were generally linear over the range of concentrations tested. Sorption capacity was directly related to organic carbon content such that partition coefficients for silt Loam soil > Sandy Loam soil > sand. Triclosan had the highest values of Kf (231 in the Sandy Loam and 344 in the silt Loam) and K d (256 in the Sandy Loam and 282 in the silt Loam). The log Koc values for the PPCPs tested varied from 1.85 to 4.30. Desorption tests over 24 h indicated that caffeine had the greatest desorption capacity (>15%) among the compounds in Sandy Loam soil, while triclosan had the lowest desorption capacity ( Sandy Loam soil > sand.
Astrid Volder - One of the best experts on this subject based on the ideXlab platform.
-
root growth dynamics and fruit yield of melon cucumis melo l genotypes at two locations with Sandy Loam and clay soils
Soil & Tillage Research, 2017Co-Authors: Sat Pal Sharma, Daniel I Leskovar, Kevin M Crosby, Astrid VolderAbstract:Abstract In a two year minirhizotron study (2011 and 2012), the root growth, yield and fruit quality responses of six melon genotypes to two locations with different soil types were investigated. The field experiments were conducted in south Texas at two locations viz. Uvalde with clayey (hyperthermic aridic calciustolls) and Weslaco with Sandy Loam (hyperthermic typic calciustolls) type soils, with subsurface drip irrigated using black plastic mulch. Root length intensity ( L a , cm cm −2 ), marketable (MFY), total fruit yield (TFY; t ha −1 ), fruit firmness (N) and soluble solids content (SSC; °Bx) of four TAMU inbreds and two commercial hybrids, Mission and Journey were measured. Root length intensity was lower in 2011 than in 2012, possibly due to the variations in climatic, and soil conditions, and minirhizotron tube artifacts. Sandy Loam soil produced 77% higher L a (1.6 vs. 0.9 cm cm −2 ) as compared to clay soil. Under Sandy Loam soils, root growth distribution was deeper (40–70 cm) while it was confined at the depth of drip tape ( L a to most popular commercial cultivar Mission and higher L a than Journey. These results reveal that under high input intensive production systems large root systems may not be required for high yielding potential, however under Sandy Loam soils cultivars vary in their root distribution patterns across soil depth. Further, the great rooting ability of TAMU breeding lines under different soil types and equivalent yield potential to commercial hybrids confirms their suitability as a potential parent for developing genetically improved and stable cultivars for a wide range of environments.
Zhuo Wei - One of the best experts on this subject based on the ideXlab platform.
-
effect of biochar amendment on sorption desorption and dissipation of 17α ethinylestradiol in Sandy Loam and clay soils
Science of The Total Environment, 2019Co-Authors: Zhuo Wei, Jim J Wang, Amy B Hernandez, Andrea Warren, Jonghwan Park, Yili Meng, Syam K Dodla, Changyoon JeongAbstract:Animal manure application in agricultural land has caused the release of steroid estrogens in the soil environment and further movement to aquatic systems. The objective of this study was to investigate the effects of biochar addition on sorption-desorption and dissipation behaviors of 17α‑ethinylestradiol (EE2) in two different textured soils. A Commerce Sandy Loam and a Shakey clay were selected and subjected to sterilization. Soil samples with and without sterilization were reacted with a series of EE2 solutions of different concentrations for sorption followed by desorption and quantification using HPLC-MS/MS. Long-term dissipation of EE2 in the same soils was also evaluated over a 30-d incubation. Biochar amendment increased the maximum EE2 sorption capacity but decreased its water desorption in both Sandy Loam and clay soils. On other hand, biochar addition increased the Koc in the clay soil which had low EE2 sorption efficiency but decreased Koc in the Sandy Loam which had high EE2 sorption efficiency. Biochar did significantly increase both desorbable and non-extractable fractions of EE2, while it reduced the bioavailability of EE2 to microbial degradation. The dissipation of EE2 in non-sterilized soils fit to the first-order kinetic model, whereas it was better described by zero-order kinetic for sterilized soil. Biochar increased the half-life of EE2 dissipation in non-sterilized Commerce Sandy Loam soil by 48% (from 3.63 to 5.37 d) and in non-sterilized Sharkey clay soil by 67% (from 2.28 to 3.81 d). Overall, this study demonstrated positive impacts of biochar on the retention of estrogen hormones in soils.
-
Effect of biochar amendment on sorption-desorption and dissipation of 17α‑ethinylestradiol in Sandy Loam and clay soils.
The Science of the total environment, 2019Co-Authors: Zhuo Wei, Jim J Wang, Amy B Hernandez, Andrea Warren, Jonghwan Park, Yili Meng, Syam K Dodla, Changyoon JeongAbstract:Animal manure application in agricultural land has caused the release of steroid estrogens in the soil environment and further movement to aquatic systems. The objective of this study was to investigate the effects of biochar addition on sorption-desorption and dissipation behaviors of 17α‑ethinylestradiol (EE2) in two different textured soils. A Commerce Sandy Loam and a Shakey clay were selected and subjected to sterilization. Soil samples with and without sterilization were reacted with a series of EE2 solutions of different concentrations for sorption followed by desorption and quantification using HPLC-MS/MS. Long-term dissipation of EE2 in the same soils was also evaluated over a 30-d incubation. Biochar amendment increased the maximum EE2 sorption capacity but decreased its water desorption in both Sandy Loam and clay soils. On other hand, biochar addition increased the Koc in the clay soil which had low EE2 sorption efficiency but decreased Koc in the Sandy Loam which had high EE2 sorption efficiency. Biochar did significantly increase both desorbable and non-extractable fractions of EE2, while it reduced the bioavailability of EE2 to microbial degradation. The dissipation of EE2 in non-sterilized soils fit to the first-order kinetic model, whereas it was better described by zero-order kinetic for sterilized soil. Biochar increased the half-life of EE2 dissipation in non-sterilized Commerce Sandy Loam soil by 48% (from 3.63 to 5.37 d) and in non-sterilized Sharkey clay soil by 67% (from 2.28 to 3.81 d). Overall, this study demonstrated positive impacts of biochar on the retention of estrogen hormones in soils.
