Seasonal Rainfall Effects on Pesticide Leaching in Riverside, California

摘要

The objective of the study was to investigate the extent to which precipitationaffects the mobility of pesticides in sandy loam soil which received no additional irrigation. During a four month period, 172 mm of rain fell on the experimental plots to which ordram, simazine and carbofuran had been applied at a rate of 0.001 kg active ingredient m(-2). A qualitative evaluation of soil cores taken upon conclusion of the study indicated that the bulk of the pesticide applied was not detectable below a depth of 0.76 m. The use of two sampling techniques, split barrel mobil drill auger vs bucket-auger, to collect the samples, enabled a comparison which indicated that the use of bucket-auger to collect contaminated samples in dry sandy soils, may not be the most appropriate method.