Phorate Accumulation by Cotton Plants and Recovery from Soil1

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Abstract
Small-plot field tests were used to study phorate uptake by cotton plants following seed and in-furrow granular applications; phorate recovery from the soil was studied also. In-furrow granular treatments with phorate reduced phytotoxicity and gave aphid control similar to that with the standard carbon seed treatment. Studies with p32-labeled phorate showed similar amounts of phorate-equivalents in plants treated by both methods. Radioassay of soil cores showed 70% or more of the radioactivity in the top 1.5 inches 1 to 7 weeks after planting. The combined quantities of radioactivity extractable with chloroform and water decreased with time to a low of about 25% in each of the treatments. Generally, similar amounts of radioactivity were recovered in the chloroform and water extracts.