1994 Volume 22 Issue 2 Pages 197-207
A test turf-green (Pencross bentgrass) was set up on the sand dunes of suburban Niigata during 1990-1991. Experiments were made to determine the relationship between the quantities of underdrainage and the released contents of agricultural chemicals by rain water or overhead irrigation. The chemicals used were; acephate, flutoluanil, chloroneb, isoxathion, chlorothalonil, isoprothiolane, trichlorofon, metalaxyl, isofenphos, thiram and tolclophosmethyl. The results were as follows ;
1. The amount of drained water in 1991 depended on the amount of precipitation in each month rather than sprinkler irrigation. The quantity of under-drained water by precipitation did not show much difference between 1990 and 1991.
2. The chronological changes of agricultural chemicals in the drained water through the Test-Green sward were tested using acephate, flutoluanil and chloroneb. The amount of flutoluanil increased in the drained water in 1991 rather than in 1990. The other chemicals, acephate and chloroneb were also detected in the drained water in 1990. Although acephate was recovered at a higher level than other chemicals and acephate and chloroneb were not detected in the drained water in 1991.
3. The additional agricultural chemicals used in 1991 were isoxation, chlorothalonil, isoprothiolane, trichlorofon, metalaxyl, isofenphos, thiram and tolclophosmethyl. The recovery was highest in trichlorfon, followed by metalaxyl and isoprothiolane. Other chemi-cals were detected in small amount or not detected.
