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| Effect of Different Cultivation Techniques on Rice Yield and NPK Runoff Losses |
| Received:March 13, 2015 |
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| KeyWord:cultivation techniques;rice yield;surface runoff;NPK loss;NPK loss rate |
| Author Name | Affiliation | E-mail | | LIU Hong-jiang | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agriculture Sciences, Nangjing 210014, China | | | GUO Zhi | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agriculture Sciences, Nangjing 210014, China | | | ZHENG Jian-chu | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agriculture Sciences, Nangjing 210014, China | zjc@jaas.ac.cn | | CHEN Liu-gen | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agriculture Sciences, Nangjing 210014, China | | | ZHOU Wei | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agriculture Sciences, Nangjing 210014, China | |
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| Abstract: |
| Cultivation techniques greatly influence crop yield and nutrient dynamics. A field experiment was conducted to investigate the effects of different cultivation techniques on rice yield and the amounts and rates of total nitrogen(N), total phosphorus(P), and potassium(K) runoff losses. The rice cultivar Su 101 was chosen. Three treatments including super high production technique(SP), conventional production technique(CP), and reduced fertilization production techniques(RP) were employed. Compared to CP, SP increased rice yield by 11.1%,but RP did not show obvious difference in rice yield. Total runoff depth was 3.9×102 mm during rice growth season. Amounts of total N, total P, and total K losses were significantly different among treatments, and were in order of SP> CP> RP. The rates of NPK losses did not show significant difference between RP and CP, but they were significantly higher than that of SP. The partial factor productivity of nitrogen was RP> CP> SP. Although SP significantly increased the rice yield, it caused significant increases in total N, total P, and K losses. While CP significantly decreased the NPK loss rates, the partial factor productivity of nitrogen was low. The RP produced rice yield equivalent to that of CP, whereas it significantly decreased the total N, total P, and K losses with increased partial factor productivity of nitrogen. |
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