Results 291 to 300 of about 1,168,431 (343)

Pyrethroid insecticide residues on vegetable crops

Pest Management Science, 2001
Abstract Pyrethroid insecticides were applied on various vegetable crops as foliar treatments to determine dissipation rates. On Chinese broccoli (Guy Lon), Chinese mustard (Pak Choi) and Chinese cabbage (Kasumi, napa), fenvalerate was persistent with residues of 0.10, 0.14 and 0.11 mg kg −1
B D, Ripley, G M, Ritcey, C R, Harris, M A, Denommé, P D, Brown   +4 more
openaire   +2 more sources

Visualizing soil surfaces and crop residues

IEEE Computer Graphics and Applications, 1993
A test case for visualizing field and laboratory data pertaining to soil erosion and infiltration is examined. Several visualization techniques were used to derive image data from an experiment in which the effect of a sequence of five rainfalls on a laboratory-formed soil surface was measured.
Christopher J. Moran, Guy Vézina
openaire   +2 more sources

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.
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources

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

Rogor (dimethoate) residues in food crops

1965
Owing to its high insecticidal activity, systemic properties and relatively low toxicity to mammals, Rogor [O,O-dimethyl S-(N-methyl carba- moylmethyl)phosphorodithioate], also known as dimethoate in the USA and in other countries and as Fosfamide in the Soviet Union, has found a progressively increasing use for the control of several species of ...
P, De Pietri-Tonelli, B, Bazzi, R, Santi
openaire   +2 more sources

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
openaire   +2 more sources

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