Effects of nitrogen fertilization strategies on nitrogen use efficiency in physiology,recovery, and agronomy and redistribution of dry matter accumulation and nitrogen accumulation in two typical rice cultivars in Zhejiang,China |
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| Authors: | Xie Wen-xia Wang Guang-huo Zhang Qi-chun Guo Hai-chao |
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| Institution: | (1) Institute for Soil and Water Resources and Environment, Zhejiang University, Hangzhou, 310029, China |
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| Abstract: | Field experiments were conducted in farmers’ rice fields in 2001 and 2002 to study the effects of nitrogen (N) management
strategies on N use efficiency in recovery (RE), agronomy (AE) and physiology (PE) and redistribution of dry matter accumulation
(DMA) and nitrogen accumulation (NA) in two typical rice cultivars in Jinhua, Zhejiang Province. This study aimed mainly at
identifying the possible causes of poor fertilizer N use efficiency (NUE) of rice in Zhejiang by comparing farmers’ fertilizer
practice (FFP) with advanced site-specific nutrient management (SSNM) and real-time N management (RTNM). The results showed
that compared to FFP, SSNM and RTNM reduced DMA and NA before panicle initiation and increased DMA and NA at post-flowering.
There is no significant difference between SSNM and FFP in post-flowering dry matter redistribution (post-DMR) and post-flowering
nitrogen redistribution (post-NR). These results suggest that high input rate of fertilizer N and improper fertilizer N timing
are the main factors causing low NUE of irrigated rice in the farmer’s routine practice of Zhejiang. With SSNM, about 15%
of the current total N input in direct-seeding early rice and 45% in single rice could be reduced without yield loss in Zhejiang,
China.
Project supported by the International Rice Research Institute (IRRI), Swiss Agency for Development and Cooperation (SDC),
the Potash & Phosphate Institute and the Potash & Phosphate Institute of Canada (PPI-PPIC), the International Fertilizer Industry
Association (IFA), the International Potash Institute (IPI), and 948 Project of the Ministry of Agriculture of China (No.
2003-Z53) |
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| Keywords: | Recovery N use efficiency (RE) Agronomic N use efficiency (AE) Physiological N use efficiency (PE) Nitrogen management Rice Accumulation and redistribution |
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