数字农科院2.0

Yield production efficiencies as affected by nutrient management strategies under different rice cropping systems

文献类型： 外文期刊

作者： Xu, Zhuo;He, Ping;Yin, Xinyou;Struik, Paul C.

作者机构：

关键词： Harvest index;Radiation interception;Nitrogen application rate;Nitrogen fertiliser;Radiation use efficiency

期刊名称： FIELD CROPS RESEARCH

ISSN： 0378-4290

年卷期： 2025 年 337 卷

页码：

收录情况： SCIE（2025版）

摘要： Context: Smart nutrient management strategies enhance rice yield while conserving resources. Nutrient Expert (R) (NE) was designed to offer fertilisation decision support for smallholders to improve productivity compared with farmers' practice (FP) and commonly used soil testing-based management (ST). So far, NE-led yield increase in rice was analysed in terms of nutrient use efficiency. However, the crop physiological basis of the yield increase has not been investigated in detail, especially not in terms of the crucial parameter radiation use efficiency (RUE). Methods: We analysed data from multi-location field experiments conducted in 2019 and 2020, varying in management of the cropping system and nutrient supply. Yield formation was dissected into components, consisting of the efficiency of intercepting incident radiation by the canopy (ei), the efficiency of converting intercepted radiation into biomass (ec, or RUE), and the efficiency of partitioning biomass to grains (ep, or harvest index). Results: Overall, season-long values of epsilon i with suitable fertilisation were in the range of 0.7-0.8; ec ranged from 0.6 to 1.9 g MJ-1, depending on soil nutrients, environmental conditions, and genotype. ep values were in the range of 0.5 - 0.6. Despite higher ei of FP due to the increase in N input, NE had a slight yield advantage, mainly attributed to the improved ec and ep. Across most rice cropping systems, correlations of yield were strongest with ec, followed by the correlation with ei, among the three efficiencies. Conclusions and implications: We identified ec as the major, and ei as the second important, physiological parameter underlying the yield increase by NE-based nutrient management. This differs from the results of crop improvement during the Green Revolution when ep primarily contributed to yield gain in major cereal crops.

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