Drip-line samples

For the study of the degradation of carbaryl, 25 leaves were picked from each of the 3 apple trees in each plot as follows starting near the crown of the tree, 8 leaves were picked randomly down to the drip line and this procedure was repeated at 2 other positions approximately 1/3 of the way around the tree. At the 3rd position, 9 leaves were picked. The leaves from each tree were then composited into one sample, so there were 3 replicate samples from each plot, and taken to the laboratory where they were immediately prepared for the extraction. Leaf samples were taken at intervals of 0, 1, 3, 7, 17, 24, 31, 38, and 52 days after the trees were sprayed with a carbaryl. 

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