Run-off Performance of Drained Water and Agricultural Chemicals in Test-Turf Green.

概要

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Experiments were conducted to obtain some basic informations on the quantities of underdrained water and the agricultural chemicals under various intensities of precipitation and overhead irrigation by using test turf-green (Pencross bentgrass) set up in sand dunes of suburban Niigata during 1990. The chemicals used were acephate, iprodione, flutoluanil, oxine-copper, fenitrothion and diazinon. The results obtained were as follows:<BR>1. There were two draining patterns in the rate of underdrainage. When the soil was wet condition, the drained water ran off quickly in large amount after one hour of sprinkler irrigation, then decreased gradually. While under dried soil condition the water drained slowly and the initial drainage was less than those of wet soil.<BR>2. The amount of drained water was determined absolutely by the amount of precipitation in each month than those of sprinkler irrigation.<BR>3. Higher recovery of applied chemicals were found with acephate, followed by iprodione, flutoluanil, oxine-copper and fenitrothion. Oxine-copper and fenitrothion were detected in least. Diazinon was not detected in the drained water.<BR>4. Most chemicals were detected in the drained water within a few weeks of application, especially in three days in case of acephate. Flutoluanil seems to appear in slower rate.
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