A Knowledge-Based Model for Nitrogen Management in Rice and Wheat

作者：Cao Jing^*; Jing Qi; Zhu Yan; Liu Xiaojun; Zhuang Sen; Chen Qingchun; Cao Weixing

来源：Plant Production Science, 2009, 12(1): 100-108.

DOI：10.1626/pps.12.100

• Grain yield
• Nitrogen fertilization model
• Nitrogen strategy
• Rice
• Wheat

Excessive nitrogen fertilization results in low nitrogen-use efficiency. TO improve nitrogen management for high yield and high nitrogen efficiency in rice and wheat, we developed a knowledge-based nitrogen fertilization model by integrating the quantitative relationship between N fertilization and yield target with respect to N supply mid demand balance. The total amount of nitrogen and ratio of haul to top dressing nitrogen could be determined by this nitrogen fertilization model, and the desirable nitrogen fertilizer strategies could be made under the Conditions of, different climates, Soil types and managements. Furthermore, the function of dynamic regulation of pre-designed N dressing rate could he determined by using the nitrogen fertilization model on the basis of actual growth status under a specific production system. The nitrogen fertilization model is evaluated using We dam from field experiments of rice and wheat m Nanjing, and the results Oil Crop growth pattern mid N use showed Mat Me grain yield and N recovery, were markedly improved by the N fertilization plan given by the model. The nitrogen fertilization model call be used as guidance for quantifying N fertilization strategy in cereal crop production.

• 出版日期2009-1
• 单位南京农业大学