Approaches and practices for cultivating nitrogen-saving and high-yielding super hybrid rice

摘要

This paper deals with the conflicts of rice production in China in the past 50 years between a continuous increase in both rice production and nitrogen consumption. Super high-yielding rice cultivation occurs with a large quantity of nitrogen and excessive nitrogen application along with low rice profits and serious environmental pollution. Researchers first put forward the new concept of nitrogen-saving and high-efficiency cultivation (NSHEC) of super hybrid rice and further discussed three approaches for NSHEC of super hybrid rice, using genetic dominance to tolerate low nitrogen or have high efficiency, and optimizing the techniques of nitrogen management and applying new fertilizer products, such as slow-release urea. Based on field experiments with super hybrid rice, research results indicated that significant differences exist in nitrogen use between super rice hybrids, types of fertilizer, along with cropping techniques. I optimized the techniques of NSHEC for super hybrid rice for yield of 12 t ha–1.