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Effect of Fall Plowing Methods on Runoff and Nutrient Losses from Paddy Plot during Non-Cropping Season

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  012121,  2001 ASAE Annual Meeting. (doi: 10.13031/2013.3833) @2001
Authors:   K. S. Yoon, J.Y. Cho, J. K. Choi, J. G. Son, S. M. Choi, K. H. Yoo
Keywords:   Tillage, water quality, rice paddy field, management

Runoff, sediments and nutrient losses were studied under different patterns of paddy field management: (1) fall and spring plowing (Plowing); (2) fall plowing for half of plot and spring plowing (Semi-plowing); (3) no-till for fall and spring plowing (Un-plowing) during the non-cropping period in the southern Korea for two years. The runoff and initial abstract were significantly affected by plowing practices. Un-plowing plot showed the highest runoff among treatments. The concentrations of sediment from Plowing plot were much higher than those f rom Un-plowing plot, especially after fall plowing. Sediment losses from Plowing plot were 25% more than those from Un-plowing plot. There was significant difference in nutrient losses via runoff water and sediment according to plowing practice. Two-year average of losses of N from paddy field during non-cropping period were 9.42 kg ha -1 , 8.17 kg ha -1 , and 7.76 kg ha -1 for Un-plowing, Semi-plowing, and Plowing plot, respectively, while losses of P were 0.64 kg ha -1 , 0.58 kg ha -1 , and 0.58 kg ha -1 for each tillage system. Losses of total-N, ammonia-N, nitrate-N, Total-P from Un-plowing plot was larger than Plowing and Semi-plowing plots during study period. Even though concentrations of nutrient constituents were higher from Plowing and Semi-plowing plots than those of Un-plowing plot, higher runoff amount from Un-plowing plot account for the observed results.

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