Based on expounding the importance of carrying out the crop straw overlaying technique in the arid areas and semiarid areas,this paper makes analysis and discussion on the structure and working principle of the maize straw half-overlaying machine,and looks forward to the developing prospect of the maize straw half-overlaying machine.

Effects of straw mulch on the growth of maize under insufficient irrigation;

Requirements of water and nitrogenous fertilizer to increase winter wheat yield under straw mulch;

Simulation study on influence of straw mulch on soil moisture and heat of summer corn farmland;

Straw cover not only has the obvious effect of water storage and moisture preservation,but also can improve the physical and chemical properties of soil,fertilization of arable land fertility,and reduce soil erosion,which is a measure that has very significant effect in dry farming production technology.

Therefore,the controlled traffic tillage with straw cover was adopted based on the ridge culture techniques,by changing flood irrigation to furrow irrigation to study the effect of soil water under controlled traffic tillage irrigation.

The influence of permanent no-tillage with straw cover in long term on the change of soil total organic nitrogen had been studied in Dingxi county,one of the typical semi-arid areas in Gansu Province.