Response of Rice and Maize Yield to Inherent Soil Productivity of Paddies and Fertilization in Chongqing China

Abstract

Abstract. Through research on basic soil fertility, nutrient supply capacity and the effect of fertilization on Chongqing paddy fields and dry farms, we evaluated the impact of basic soil fertility and fertilization on the output of rice, clarifying the relationship between basic soil fertility and the utilization efficiency of nutritional absorptions of Nitrogen, Phosphorus and Potassium. Our goal was to provide a scientific reference on fertilizer for the enhancement of soil fertility and a reasonably high output of crops at low cost. This paper determines grain and straw output and the nutrient absorption of rice and maize according to the selection of five treatments: CK, PK, NK, NP and NPK5. Data were collected from 703 rice plots and maize pilots in Chongqing under the stated project of soil testing and formulated fertilization during 2006-2010. We analyzed the current condition of basic soil fertility, nutrient supply capacity and effect of fertilization, as well as the interrelation of paddy fields and dry farms in Chongqing, and estimated the fertilization effect, the output stability and sustainability across different basic soil fertilities on the basis of rice production.