Ways to raise unit production of longwall face;

Discussion on methods of increasing unit production of fully mechanized caving in relatively thinner thick coal seam;

Some Measures for Enhancing the Corn Yield in Jilin Province;

But different researches have obtained different results of correlation between genetic diversity and crop yield as indicated by COP.

The yield potential of rice in Guangdong is great with the improved varieties.

Increasing cassava yield per unit is the way of cassava fuel-alcohol about raw material problem;

The accuracy of estimating per unit area yield mainly depends on the representative quality of the sample plot.

To construct high yield and high efficiency coal mine can improve annual output,convenience disposal of drift,predigest production system.

Introdliced the producuon and management technologies of the Daxing Coal mine increasing unit yield and its digging,and building high yield and high efficiency mineral well,and introduced the experience of the mechanization apply level and basic mange.

Way of lifting the per unit area yield at mechanical mining face with single-ended machine in the middle and thick seam;

The article analyses China s grain comprehensive production capacity by using data of China s grain production from 1983 to 2005 and selecting the two major indicators of grain acreage and grain yield.