This paper study on the effects of PAM on improving water stable aggregate and reducing nutrients loss from sandy soil,methods of Laboratory incubation and leaching were adopted.

The dynamic of crop yield, soil water stable aggregate, soil oxidizable organic carbon, organic carbon and phosphorous w.

The new kind of CSD diamond abrasive with the crumb structure which consists of many fine crystals has the character of coarsen and scraggy surfaces, it can avoid that single cystals early fall off because of the fast- ness in the bonder; CSD abrasive keeps tiny blade fragmentations and several cutting blades and thus the self-sharp- ening of CSD abrasives is very good.

The formation of the aggregate structure with the diameter of 0.

Fractal features of soil aggregate structure under natural evergreen broadleaved forest and regeneration of artificial systems is rarely s.

This paper contrasted and researched the soil quality of different vegetation zone with plant restoration and farmland,including soil bulk density,soil porosity,and soil water stable aggregate structure in Wuqi county of Shanxi province.

Using the fractal theory,elasticity analysis and marginal yield analysis,the regressive model on the fractal dimension of soil granular structure to soil aggregate content and structure damage percentage was figured out to study the effect on the soil granular structure in different mixed proportion stand C.