| Effects of upland cultivation on rice grain yield and N & P use efficiency |
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| DOI：10.16302/j.cnki.1000-7601.2015.01.030 |
| Key Words: rice upland cultivation grain yield N & P use efficiency |
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| Abstract: |
| To investigate the effects of upland cultivation on N & P use efficiency and the relationship between grain yield and N & P nutrition, a micro-zone experiment in greenhouse was conducted to study rice grain yield, yield components, N & P accumulation, N & P harvest index, N & P physiological use efficiency, and correlation between yield and N & P nutrition under conventional floodwater cultivation (CT), film mulching cultivation (FM), and uncovered cultivation (LD) treatments, respectively. The results showed that upland cultivation inhibited rice growth to some extent and lowered grain yield. However, grain weight was least affected with upland cultivation. Grain yield under FM treatment was reduced by 6.47% compared with that under CT treatment, which was not at a significant level. Also, N & P accumulation under FM treatment were not apparently affected. However, LD treatment reduced grain yield by 14.9% and decreased N & P accumulation. Additionally, N & P harvest indexes were more sensitive to upland cultivation than N & P physiological use efficiency. Though both FM and LD treatments had reduced N & P harvest indexes, LD treatment played a more predominant role. It was further found that rice grain yield showed better correlation with N nutrition than P nutrition. Therefore, it was concluded that FM treatment could efficiently alleviate the effects of upland cultivation on rice growth and nutrients use efficiency. In addition, better N & P nutrition management, especially N nutrition, was favorable for improving rice growth and grain yield. |
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