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COMPUTED REDISTRIBUTION OF PESTICIDES IN THE ROOT ZONE OF AN ARABLE CROP

M. LEISTRA
Plant and Soil
Vol. 49, No. 3 (JUNE 1978), pp. 569-580
Published by: Springer
Stable URL: http://www.jstor.org/stable/42933621
Page Count: 12
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COMPUTED REDISTRIBUTION OF PESTICIDES IN THE ROOT ZONE OF AN ARABLE CROP
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Abstract

A series of computations was made to simulate the redistribution in the soil of four model pesticides that had been incorporated to a depth of 8 cm in spring. Water flow in the soil after low, average and high rainfall, respectively, was described in some detail. Data for potato crops were used for the schematized description of root uptake activity as a function of depth in soil and time. It was found that redistribution of the pesticides in the soil occurred mainly in the first month after application, when water uptake by the root system was comparatively small. Under average rainfall conditions only the weakly adsorbed compounds were redistributed markedly. With the moderately to strongly adsorbed pesticides, and with any pesticide under low rainfall conditions, redistribution was limited to a few centimetres. The risk of weakly adsorbed pesticides being leached too deeply as a result of high rainfall was clearly demonstrated.

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