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For 360 grams per litre (0.013 lb/cu in) formulations, European regulations allow applications of up to 12 litres per hectare (1.1 imp gal/acre) for control of perennial weeds such as couch grass. More commonly, rates of 3 litres per hectare (0.27 imp gal/acre) are practiced for control of annual weeds between crops. [52]
Roundup is used most heavily on corn, soy, and cotton crops that have been genetically modified to withstand the chemical, but as of 2012 glyphosate treated approximately 5 million acres in California for crops like almond, peach, cantaloupe, onion, cherry, sweet corn, and citrus, [78] although the product is only applied directly to certain ...
The glyphosate-based herbicide RoundUp (styled: Roundup) was developed in the 1970s by Monsanto. Glyphosate was first registered for use in the U.S. in 1974. [4] Glyphosate-based herbicides were initially used in a similar way to paraquat and diquat, as non-selective herbicides. Attempts were made to apply them to row crops, but problems with ...
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Organic agriculture, which uses only non-synthetic pesticides, has grown and in 2020 represents about 1.5 per cent of the world's total agricultural land. [15] Pesticides have become more effective. Application rates fell from 1,000 to 2,500 grams of active ingredient per hectare (g/ha) in the 1950s to 40–100 g/ha in the 2000s. [15]
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The timing of application is crucial as the moisture content of the grain must be below 30% for the yield of the crop to be unaffected and to minimize uptake of glyphosate by the grain. [23] Yield may be affected and residues increased if applications are made to uneven fields in which some areas have a moisture content over 30%.
Pesticide standard values for many current and historical largely used pesticides such as DDT, aldrin, lindane, glyphosate, MCPA, chlorpyrifos, and 2,4-D often vary over seven, eight, or nine orders of magnitude and are log-normally distributed, which indicates that there is little agreement on the regulation of pesticide standard values among ...