Jianbo Shen1, Fusuo Zhang1, Jingying Jing1, Jianchang Yang2, Yingbin Zou3, Guanghuo Wang4, Yuanying Liu5, Rengang Li6, Xuhua Zhong7, and Jianliang Huang8. (1) China Agricultural University, College of Resources and Environmental Sciences, No. 2, Yuanmingyuan West Road, Beijing, 100094, China, (2) Yangzhou University, Yangzhou, China, (3) Hunan Agricultural University, Changsha, China, (4) Zhejiang University, Hangzhou, China, (5) Northeast Agricultural University, Haerbin, China, (6) Hebei Agricultural University, Baoding, China, (7) Guangdong Academy of Agricultural Sciences, Guangzhou, China, (8) Huazhong Agricultural University, Wuhan, China
Rice is one of the most important grain
crops in China.
The lack of effective cultivation technology and fertilizer application method led
to a very low rice production before 1960s. From 1961 to 1976, the planting
area increased by 37.8% whereas total yield increased by 134.5%. Application of
N and P fertilizers significantly enhanced rice production. After 1976, despite
the decreased planting areas, rice production steadily increased till 1990,
showing a good correlation with fertilizer application rates (r = 0.966). From
1991 to 1998, the correlation coefficient between rice production and
fertilizer application rates was declined to 0.852, and even to 0.199 from 1999
to 2006, indicating a rapidly decreasing response of crop yield to
fertilization. During the past two decades, extension of some strategies of fertilizer
recommendation definitely played an important role in improving rice
production, particularly soil or plant testing, balanced fertilization,
fertilizer-yield response model development and the combined application of
organic and inorganic fertilizers. Since 1990s, highly intensive farming system
and rapid development in economy stimulated farmers to overuse chemical
fertilizers in rice ecosystem, particularly N fertilizer, resulting in a series
of problems such as rice yield decrease, low nitrogen use efficiency, low rice quality
and increasing environmental pollution. Optimizing nutrient resource management
in rice ecosystem through integrating optimal nutrient management, efficient
water and nutrient resource utilization, high-yield crop management and
environmental risk evaluation system becomes more and more important for the
development of sustainable rice production in China.