There is a linear relationship between acoustic amplitude value of the reservoir interval and fluid pressure coefficient of the reservoir (or reservoir productivity).
Sowing seeds about April 20, the coefficient of leaf area assort with the productivity of single plant, the yield of maize is tallest, and can resist and avoid the drought;
谷雨节前后播种，叶面积系数与单株生产力协调一致达最佳，玉米产量最高，既能抗夏旱又能避伏旱；
3
To measure the leaf area coefficient and productivity more conveniently, this paper draws up an useful leaf area table.