CORRELATION ANALYSIS BETWEEN SOIL ELECTRICAL CONDUCTIVITY AND WINTER WHEAL YIELD
Taking “Jingdong 12 winter wheat as the experimental objective, the correlation between soil electrical conductivity (EC) in a crop growth season and the yield of the winter wheat was analyzed. A 1:5 soil water extract method was used to measure soil EC during the whole winter wheat growth season. The winter wheat yield was measured by a combine harvester with a Global Position System (GPS) receiver and a yield mapping system that could record the yield data and locations of zones. Statistical analysis show that there is a linear correlation between soil EC and the winter wheat yield at different growth stages of the winter wheat. Correlation coefficients were calculated between soil EC data and the yield of the winter wheat. Estimation models of the winter wheat yield with soil EC data were established in every growth stage. The coefficients of determination for models were all greater than 0.630 and better results were obtained at the heading, watery and milk stages, respectively. The best model correlation coefficient reached 0.678 at the watery stage. Soil EC, as a comprehensive index of soil physical and chemical properties, can serve as a guideline for soil productive potentiality, and can be used to assess the variability of crop yield, determine management zones, and make a variable rate prescription for precision agriculture.
Electric conductivity Agricultural engineering Correlation methods Yield
Yong Zhao Minzan Li Junning Zhang
Key laboratory of Modern Precision Agriculture System Integration Research,Ministry of Education,China Agricultural University,Beijing 100083,China
国际会议
北京
英文
1-6
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）