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N K Patni - One of the best experts on this subject based on the ideXlab platform.

  • dissipation of cyanazine and metolachlor on a Clay Loam soil ontario canada 1987 1990
    Archives of Environmental Contamination and Toxicology, 1991
    Co-Authors: R Frank, B S Clegg, N K Patni
    Abstract:

    Dissipation of cyanazine and metolachlor was determined following two and three applications, respectively, to a Clay Loam soil at the Animal Research Centre Farm, Ottawa between 1987 and 1990. Residue decline, leachability into the soil profile, movement into tile drainage water, and contamination of the groundwater of the two herbicides were measured. The amount of each herbicide applied to the soil surface was accounted for in the upper layer during the first week following treatment.

  • Dissipation of cyanazine and metolachlor on a Clay Loam soil, Ontario, Canada, 1987–1990
    Archives of Environmental Contamination and Toxicology, 1991
    Co-Authors: R Frank, B S Clegg, N K Patni
    Abstract:

    Dissipation of cyanazine and metolachlor was determined following two and three applications, respectively, to a Clay Loam soil at the Animal Research Centre Farm, Ottawa between 1987 and 1990. Residue decline, leachability into the soil profile, movement into tile drainage water, and contamination of the groundwater of the two herbicides were measured. The amount of each herbicide applied to the soil surface was accounted for in the upper layer during the first week following treatment.

R Frank - One of the best experts on this subject based on the ideXlab platform.

  • dissipation of cyanazine and metolachlor on a Clay Loam soil ontario canada 1987 1990
    Archives of Environmental Contamination and Toxicology, 1991
    Co-Authors: R Frank, B S Clegg, N K Patni
    Abstract:

    Dissipation of cyanazine and metolachlor was determined following two and three applications, respectively, to a Clay Loam soil at the Animal Research Centre Farm, Ottawa between 1987 and 1990. Residue decline, leachability into the soil profile, movement into tile drainage water, and contamination of the groundwater of the two herbicides were measured. The amount of each herbicide applied to the soil surface was accounted for in the upper layer during the first week following treatment.

  • Dissipation of cyanazine and metolachlor on a Clay Loam soil, Ontario, Canada, 1987–1990
    Archives of Environmental Contamination and Toxicology, 1991
    Co-Authors: R Frank, B S Clegg, N K Patni
    Abstract:

    Dissipation of cyanazine and metolachlor was determined following two and three applications, respectively, to a Clay Loam soil at the Animal Research Centre Farm, Ottawa between 1987 and 1990. Residue decline, leachability into the soil profile, movement into tile drainage water, and contamination of the groundwater of the two herbicides were measured. The amount of each herbicide applied to the soil surface was accounted for in the upper layer during the first week following treatment.

D S Chanasyk - One of the best experts on this subject based on the ideXlab platform.

  • influence of long term application of feedlot manure amendments on water repellency of a Clay Loam soil
    Journal of Environmental Quality, 2017
    Co-Authors: J J Miller, C F Drury, B W Beasley, Paul Hazendonk, D S Chanasyk
    Abstract:

    Long-term application of feedlot manure to cropland may increase the quantity of soil organic carbon (C) and change its quality, which may influence soil water repellency. The objective was to determine the influence of feedlot manure type (stockpiled vs. composted), bedding material (straw [ST] vs. woodchips [WD]), and application rate (13, 39, or 77 Mg ha) on repellency of a Clay Loam soil after 17 annual applications. The repellency was determined on all 14 treatments using the water repellency index ( index), the water drop penetration time (WDPT) method, and molarity of ethanol (MED) test. The C composition of particulate organic matter in soil of five selected treatments after 16 annual applications was also determined using C nuclear magnetic resonance-direct polarization with magic-angle spinning (NMR-DPMAS). Manure type had no significant ( > 0.05) effect on index and WDPT, and MED classification was similar. Mean index and WDPT values were significantly greater and MED classification more hydrophobic for WD than ST. Application rate had no effect on the index, but WDPT was significantly greater and MED classification more hydrophobic with increasing application rate. Strong ( > 0.7) but nonsignificant positive correlations were found between index and WDPT versus hydrophobic (alkyl + aromatic) C, lignin at 74 ppm (O-alkyl), and unspecified aromatic compounds at 144 ppm. Specific aromatic compounds also contributed more to repellency than alkyl, O-alkyl, and carbonyl compounds. Overall, all three methods consistently showed that repellency was greater for WD- than ST-amended Clay Loam soil, but manure type had no effect.

C F Drury - One of the best experts on this subject based on the ideXlab platform.

  • influence of long term application of feedlot manure amendments on water repellency of a Clay Loam soil
    Journal of Environmental Quality, 2017
    Co-Authors: J J Miller, C F Drury, B W Beasley, Paul Hazendonk, D S Chanasyk
    Abstract:

    Long-term application of feedlot manure to cropland may increase the quantity of soil organic carbon (C) and change its quality, which may influence soil water repellency. The objective was to determine the influence of feedlot manure type (stockpiled vs. composted), bedding material (straw [ST] vs. woodchips [WD]), and application rate (13, 39, or 77 Mg ha) on repellency of a Clay Loam soil after 17 annual applications. The repellency was determined on all 14 treatments using the water repellency index ( index), the water drop penetration time (WDPT) method, and molarity of ethanol (MED) test. The C composition of particulate organic matter in soil of five selected treatments after 16 annual applications was also determined using C nuclear magnetic resonance-direct polarization with magic-angle spinning (NMR-DPMAS). Manure type had no significant ( > 0.05) effect on index and WDPT, and MED classification was similar. Mean index and WDPT values were significantly greater and MED classification more hydrophobic for WD than ST. Application rate had no effect on the index, but WDPT was significantly greater and MED classification more hydrophobic with increasing application rate. Strong ( > 0.7) but nonsignificant positive correlations were found between index and WDPT versus hydrophobic (alkyl + aromatic) C, lignin at 74 ppm (O-alkyl), and unspecified aromatic compounds at 144 ppm. Specific aromatic compounds also contributed more to repellency than alkyl, O-alkyl, and carbonyl compounds. Overall, all three methods consistently showed that repellency was greater for WD- than ST-amended Clay Loam soil, but manure type had no effect.

  • predicting soil organic carbon and total nitrogen using mid and near infrared spectra for brookston Clay Loam soil in southwestern ontario canada
    Canadian Journal of Soil Science, 2011
    Co-Authors: Xueming Yang, J.y. Yang, C F Drury, Xudong Zhang
    Abstract:

    Xie, H. T., Yang, X. M., Drury, C. F., Yang, J. Y. and Zhang, X. D. 2011. Predicting soil organic carbon and total nitrogen using mid- and near-infrared spectra for Brookston Clay Loam soil in Southwestern Ontario, Canada. Can. J. Soil Sci. 91: 53–63. Mid-infrared (MIR) and near-infrared (NIR) spectroscopy of soils have been tested to estimate soil organic carbon (SOC) and total N (TN) concentrations at local, regional and national scales. However, these methods have rarely been used to assess SOC and TN concentrations of the same soil under different management practices. The objective of this study was to determine if models developed from infrared spectra of Brookston Clay Loam soils under different management practices could be used to estimate SOC, and TN concentrations and the C:N ratio. Soils used for model calibration included 217 samples from a long-term fertilization and crop rotation study and a long-term compost study, whereas 78 soil samples from a long-term tillage study on the same soil typ...

  • energy inputs for conservation and conventional primary tillage implements in a Clay Loam soil
    Transactions of the ASABE, 2008
    Co-Authors: Neil B Mclaughlin, X. M. Yang, W. D. Reynolds, C F Drury, Y X Li, T W Welacky, G Stewart
    Abstract:

    An instrumented research tractor was used to determine the energy inputs for eight primary tillage implements applied to a Brookston Clay Loam soil in southwestern Ontario, Canada. The energy measurements included draft, fuel consumption (L ha-1), and specific fuel consumption (L GJ-1), which is an indicator of tractor-implement match. Implements included moldboard plow, chisel plow, disk ripper, combination chisel sweep, disk harrow, fluted coulter, deep zone till, and shallow zone till. The study was conducted over four years (2002-2005) using a randomized complete block design with fall primary tillage occurring in the wheat phase of a corn-soybean-winter wheat rotation. The disk harrow and fluted coulter were not effective primary tillage implements due to penetration of only 50 to 60 mm into the Clay Loam soil. Operating depth for the other six implements was 170 to 190 mm, except for deep zone till which was designed to operate at about 340 mm depth to loosen compacted subsoil and break up plow pans. The mean drafts for these implements ranged from 16.3 kN m-1 for the deep zone till to 5.0 kN m-1 for the shallow zone till. Fuel consumption ranged from 21.6 L ha-1 for the moldboard plow to 6.5 L ha-1 for the shallow zone till. Specific fuel consumption ranged from 110 L GJ-1 for the deep zone till to 204 L GJ-1 for the disk harrow. The large ranges in implement draft, fuel consumption, and tractor efficiency indicate that substantial energy savings can be readily obtained by selecting energy-efficient tillage implements and by proper matching of the tractor size and operating parameters to the tillage implement.

B S Clegg - One of the best experts on this subject based on the ideXlab platform.

  • dissipation of cyanazine and metolachlor on a Clay Loam soil ontario canada 1987 1990
    Archives of Environmental Contamination and Toxicology, 1991
    Co-Authors: R Frank, B S Clegg, N K Patni
    Abstract:

    Dissipation of cyanazine and metolachlor was determined following two and three applications, respectively, to a Clay Loam soil at the Animal Research Centre Farm, Ottawa between 1987 and 1990. Residue decline, leachability into the soil profile, movement into tile drainage water, and contamination of the groundwater of the two herbicides were measured. The amount of each herbicide applied to the soil surface was accounted for in the upper layer during the first week following treatment.

  • Dissipation of cyanazine and metolachlor on a Clay Loam soil, Ontario, Canada, 1987–1990
    Archives of Environmental Contamination and Toxicology, 1991
    Co-Authors: R Frank, B S Clegg, N K Patni
    Abstract:

    Dissipation of cyanazine and metolachlor was determined following two and three applications, respectively, to a Clay Loam soil at the Animal Research Centre Farm, Ottawa between 1987 and 1990. Residue decline, leachability into the soil profile, movement into tile drainage water, and contamination of the groundwater of the two herbicides were measured. The amount of each herbicide applied to the soil surface was accounted for in the upper layer during the first week following treatment.