Status of soil organic matter and available phosphorus of maize cropping land and the relationship between the two nutrients and yield levels of maize in Shenyang city;

Effect of long-term K application on corn yield and potassium forms in plough layer of black soil and meadow soil in northeast of China;

Effect of combination of thiourea and inhibitors on soil urea-Ntransformation and corn yield;

Effect of deep loosening cultivation on soil nutrients and corn yield in semiarid region of Western Liaoning Province

Effects of long-term nitrogen,phosphorus and potassium fertilizer applications on maize yield and soil fertility;

Effects of water and nutrient interaction on maize yields in lower reach of Liaohe River Plain;

Experimental study on the influence of variable rate fertilization on maize yield and soil nutrients;

Relation between summer maize yield and climatic condition in Shaanxi;

Using Related analysis, Orthognal Polynomials Integral regression and other statistical methods are adopted to analyze the correlation between the summer maize yield and many meteorological element of 1971～2003.