Preliminary study on effects of rotational tillage on soil physical properties and rice yield;

Effects of perennial grass on soil physical properties;

With the method of representative field sampling investigation and laboratory analysis,the study on the effects of different sand-fixing forests on soil physical properties in Maowusu sandland was carried out.

But in contrast, serious soil genesis horizon regressive development and soil physical property deterioration including: soil texture abruption or skeletonization, soil structure deterioration, soil porosity and moisture holding ability deg.

According to the mensuration and analysis of soil permit heaviness,soil moisture,soil maximum moisture and the yield,the effects of subsoiling and fewer-tillage on soil physical characters,water use efficiency,soil conservation storage competence and maize yield were studied.

Relationship between nicotine content and physical property in flue-cured tobacco leaves;

122 samples of cutters in flue-cured tobacco leaves from south tobacco-growing areas of China were used as materials to analyze the relationship between potassium content,chlorine content,ratio of potassium to chlorine and physical property.

Aphid resistant characteristics and the relations with physical characteristics of sorghum;

In order to investigate the relationship between the effect of adjuvants on herbicide solution and their effect on herbicide bioactivity, the physical characteristics of four herbicide adjuvants including Yaoxiaobao, 885, Oil emulsion (N32), Synertrol were measured indoors.