Results 111 to 120 of about 54,835 (162)

Identification of pentachlorobenzonitrile residues in field crops

Bulletin of Environmental Contamination and Toxicology, 1977
We recently received several carrot extracts from another FDA district laboratory for identification of a material present in each of the extracts which had a GLC retention time inconsistent with that of any known pesticide. The material, which was eluted from Florisil with 15% ether in petroleum ether (AOAC, par.
T L, Barry, F M, Gretch, J D, Rosen
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Parathion residues on leafy crops

1963
In Germany, during World War II, G. SchraDer developed the compound E-605 (O,O-diethyl-O-p-nitrophenyl thiophosphate) which is commonly known as parathion. It was soon discovered that this organophosphate was an extremely effective insecticide against a number of insect species.
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The determination of residues of dichlorvos in crops and tissues

The Analyst, 1970
An analytical method for determining residues of dichlorvos with a limit of determination of 0·01 p.p.m. is described. It is intended for use by those laboratories which carry out residue analysis for regulatory purposes, with an emphasis on speed, specificity and sensitivity.Residues of dichlorvos are extracted with either dichloromethane or ethyl ...
K E, Elgar, R G, Marlow, B L, Mathews
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INSECTICIDE RESIDUES IN COTTON CROP SOIL

Journal of Environmental Science and Health, Part B, 2001
Dimethoate, monocrotophos, triazophos, deltamethrin, cypermethrin and endosulfan were applied to a cotton crop soil located at Nurpur village, Punjab, India. The insecticides were applied sequentially at recommended dosages in cotton fields by foliar application in 1995, 1996 and 1998.
K, Vig, D K, Singh, H C, Agarwal, A K, Dhawan, P, Dureja   +4 more
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Effects of prior crop residue management on microbial properties and crop residue decomposition

Applied Soil Ecology, 1998
A litterbag decomposition experiment was conducted to test the hypothesis that differences in crop residue management practices influence the size and activity of the microbial community that regulates residue decomposition. Residues of wheat (Triticum aestivum), barley (Hordeum uulgare) and lupin (Lupinus albus) were incorporated into soils in which ...
W.R. Cookson, M.H. Beare, P.E. Wilson
openaire   +1 more source

Managing Crop Residues for the Retention of Carbon

Water, Air, & Soil Pollution, 1993
Soil organic matter, a major sink for carbon, is controlled by many factors that have complex interactions. The management of crop residues is of primary importance. Reduced tillage and no-tillage practices result in a significant build-up of soil organic matter because they greatly reduce the rates of decomposition of both the native soil organic ...
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RECYCLING CROP RESIDUES FOR USE IN RECIRCULATING HYDROPONIC CROP PRODUCTION

Acta Horticulturae, 1996
As part of bioregenerative life support feasibility testing by NASA, crop residues are being used to resupply elemental nutrients to recirculating hydroponic crop production systems. Methods for recovering nutrients from crop residues have evolved from water soaking (leaching) to rapid aerobic bioreactor processing.
C L, Mackowiak, J L, Garland, J C, Sager
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Wind Erosion Control with Crop Residues in the Sahel

Soil Science Society of America Journal, 1997
Abstract Mulching for wind erosion control in Sahelian farming systems is limited by low biomass production and use of crop residues for other purposes. The aim of this study was to test the effectiveness in soil protection created by two low amounts of crop residues.
Sterk, G., Spaan, W.P.
openaire   +3 more sources

Crop Residue Management

2016
In developing countries, the key in promoting physical, chemical, and biological attributes of soil health in agricultural systems is mainly through the retention of crop residue in fields in view of scarcity of alternative source of organic amendments.
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Parathion Residues as a Cause of Poisoning in Crop Workers

Journal of Occupational and Environmental Medicine, 1958
The application of parathion as a pesticidal spray in fields and orchards leaves a residue that declines rapidly on most crops for the first few days and more gradually during a period of weeks. Persons not actually engaged in spraying but working among trees and vines thereafter run a risk of poisoning that depends on a number of factors.
G E, QUINBY, A B, LEMMON
openaire   +2 more sources