Effect of no-paddling culture and single application of fertilizer in the nursery box reducing surface runoff loads from paddy fields
1998
Kaneki, R. (University of Shiga Prefecture, Hikone (Japan)) | Kyuma, K. | Iwama, K. | Odani, H.
Surface runoff loads were measured in two test fields at the Agricultural field Laboratory. After plowing, one test field was paddled, while the other was not. For the paddling field, nitrogen fertilizer (containing 80% of coated urea and 20% of no-coated ammonium), P2O5 and K2O wee spread over the field and then plowed. For the no-paddling field, coated fertilizer (containing 90% of urea and 10% of K2O) was treated in the nursery box and P2O5 was applied uniformly to top soil. After paddling, the concentrations of the on-paddy field water of the paddling field was increased and its transparency was decreased more than the no-paddling field. Surface runoff loads from the paddling field were increased 19 times (SS), 5 times (BOD), 12 times (D-COD), 9 times (T-N) and 14 times (T-P) as much as the no-paddling field. It appeared that the method of cultivation without paddling useful for reducing the surface runoff loads from the paddy fields
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