Abstract: Through analyzing the soil physical characteristics and maize root with different deep loosening mode, the result show that interleave row deep loosening（ T1 ） and each row deep loosening（ T2 ） can not only effec- tively break the soil plough pan,but also decrease the volume weight of soil and soil density in 10 -30 cm. T1 with the bigger effect to decrease the volume weight of soil and soil density than T2. Deep loosening can enhance soil wa- ter permeability and capacity on water depositing and holding. There is no notable difference among two deep loose- ning modes in soil water content. Due to the soil plough pan, the roots of no-deep loosening（CK） were concentrated in 0 - 20 cm depth of soil. The root dry matter,root length density and root surface in this soil layer was bigger than that of T1 and T2. But the root bleeding intensity of CK was lower than that of T1 and T2. The maize root in deep loosening treatment was not only to deep layer soil extend, but also expand the scope to plant two sides. In 20 - 50cm depth of soil,the root dry matter,root length density and root surface were bigger in T1 and T2 than in CK, and T1 was bigger than T2. Deep loosening can reduced the lodging rate and enhanced the yield to some extent. And there are no obvious yield differences between T1 and T2. The main reason for the increase of yield is deep loose- ning improved the 100-grain weight. But there are no obvious differences in kernel numbers per ear. Therefore, through interleave row deep loosening can structure well plough layer and make for maize root fasten and extend in the soil. So root could absorbed more water and nutrient. T1 decreased lodging rate and enhanced maize yield. Meanwhile,T1 decreased machine power consumption than that of T2.

Key words: Maize, Deep loosening mode, Soil physical characteristics, Root distribution

CLC Number: 

• S513.05