Effect of N fertilizer and N use efficiency under different N levels of application in high-fertility paddy field
In this paper the effect of N fertilizer and N use efficiency under different levels of N application in high-fertility paddy field in Northern Zhejiang Province was studied. The results showed that rice yield and N content of leakage water and paddy soil were greatly influenced by the amount of N f...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2006-01-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/1008-9209.2006.01.0060 |
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| Summary: | In this paper the effect of N fertilizer and N use efficiency under different levels of N application in high-fertility paddy field in Northern Zhejiang Province was studied. The results showed that rice yield and N content of leakage water and paddy soil were greatly influenced by the amount of N fertilizer. The yield showed no significant variation when the applied nitrogen were within the range of 150-225 kg·hm<sup>-2</sup>. N content of leakage water and soil increased quickly with the N application up to 225 kg·hm-<sup>2</sup>, it would lead to severe non-pointing source pollution of N. The result indicated that N use efficiency was so low that uptake of N by rice efficiency was only 21.55% in average. Agronomic and physiological efficiency of N were only 7 kg·kg<sup>-1</sup> and 20 kg·kg<sup>-1</sup>, which were far below the average level of the whole nation. Considering the N use efficiency and theory of marginal profit analysis, the 140-200 kg·hm<sup>-2</sup> could be a reasonable range of nitrogen application for the high-yielding paddy field in northern Zhejiang Province. |
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| ISSN: | 1008-9209 2097-5155 |