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Effect of Tillage Management of Paddy Field on Runoff and Nutrient Losses during Non-Cropping Season  

Yoon, Kwang-Sik (Department of Bio-Systems and Agricultural Engineering(Inst. Of Ag. Sci. and Tech), Chonnam National University)
Choi, Jin-Kyu (Department of Agricultural Engineering, (Inst. Of Ag. Sci. and Tech), Chonbuk National University)
Jun, Im-Sang (Biological Systems Engineering Department)
Publication Information
Magazine of the Korean Society of Agricultural Engineers / v.44, no.7, 2002 , pp. 53-63 More about this Journal
Abstract
Runoff, sediments and nutrient losses were studied under different patterns of paddy field management: (1) fall and spring plowing (Plowing)i (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 amount and initial abstract were significantly affected by plowing practices. Un-plowing plot showed the highest runoff amount among treatments. The concentrations of sediment from Plowing plot were much higher than those from Un-plowing plot, especially after (all 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/, 8.17kg ha$\^$-1/, and 7.76 kg ha$\^$-l/ 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 those from Plowing and Semi-plowing plots during study period.
Keywords
Tillage; Water quality; Rice paddy field; Management;
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