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Developing an Integrated Rice Management System for Improved Yield and Nitrogen Use Efficiency in Northeast China

G. Zhao, Y. Miao, F. Zhang, M. Fan

China Agricultural University

Site-specific nitrogen management (SSNM) strategy has been developed by scientists at International Rice Research Institute and evaluated across China for the past decade, with an average reduction of 32% of N fertilizers and 5% of grain yield increase compared with farmers’ practices. Integrated rice management systems are needed to further improve grain yield for food security and sustainable development. The objective of this research is to develop an integrated rice management (IRM) system in Northeast China and evaluate it against Farmer’s Practice. The IRM system increases planting density, decreases total N application, but splits the application into 5 doses, with in-season adjustments based on chlorophyll meter diagnosis, and uses alternative wetting and drying (AWD) irrigation systems. A randomized block experiment with 4 replications was conducted from 2009-2011 in Jiansanjiang, Heilongjiang Province to evaluate this integrated system against farmer’s practice (FP). This experiment has 5 treatments: 1) CK, with 0 kg ha^-1 of N; 2) Farmer’s Practice (FP); 3) SSNM+AWD; 4) High Yield (HY) Management; and, 5) IRM. The IRM was also evaluated in five farmers’ fields in 2010 as compared with FP and regional optimum management system (ROM), which is a simplified system with 3 splits of N application. Preliminary analysis indicated that the IRM system could increase rice yield by 7.6-13%, as compared with FP. Partial Factor Productivity (PFP) was increased 31-53%, while agronomic N use efficiency was increased 68-133%.

Keyword: Site-specific nitrogen management, Chlorophyll meter, High yield and high efficiency, Integrated rice management

G. Zhao Y. Miao F. Zhang M. Fan Food Security and Precision Agriculture Poster 2012

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