深翻耕作对连作滴灌棉田土壤含水率及含盐量影响的研究

Effect of Deep Tilling on Soil Moisture Content and Salinity Content of Drip Irrigation Cotton Continuous Cropping

探讨播前不同翻耕深度对连作滴灌棉田土壤容重、土壤含水率、土壤含盐量的影响。针对典型的连作滴灌棉田，于播前设置20、40和60cm的3个不同深度翻耕处理，于生育期测定各处理不同土壤剖面的上述内容，研究其变化。（1）土壤容重随翻耕深度增加而下降，其中表层土壤容重降幅大于深层土壤容重；（2）3种深翻处理下土壤剖面含水率均为0-20cm〉20-40cm〉40-60cm，随翻耕深度增加，0以0cm土壤含水率呈上升趋势，20-40cm土壤含水率变幅不大，40～60cm土壤含水率则显著下降；（3）灌水后，深翻20cm的土壤含盐量为0-20cm〉20-40cm〉40～60cm，但随翻耕深度的增加，0-20cm土壤含盐量呈下降趋势，20-40m和40～60cm的土壤含盐量迅速上升趋势，至深翻60cm时，土壤含盐量则为40-60cm〉20-40cm〉0-20cm。对连作滴灌棉田播前进行60cm的超常深翻，可有效降低耕层土壤容奄．提高0-20cm袁层土壤会水率．降低会盐量．从而利干作物生长．

The aim was to discuss the effect of soil bulk density, soil moisture content, and soil salinity content of dirp irrigation cotton continuous cropping in different tillage depth before plant. For the typical of drip irrigation cotton continuous cropping, three different plough depth processes of 20, 40 and 60 cm were set up before plant. In the growth period, the above indicators were measured in different soil profile of different treatments, and its change was studied. （1） The soil bulk density along with the plough depth increase was down, among the surface soil bulk density more than deeper soil bulk density. （2） The moisture content of soil profile under three different plough depth process were 0-20 cm〉20-40 cm〉40-60 era. Along with the plough depth increase, the soil moisture content of 0-20 cm was rose trend, the range of soil moisture content of 20-40 cm was not big, the soil moisture content of 40-60 cm was significantly decreased. （3） After the water, the soil salinity content of plough depth 20 cm was 0-20 cm〉20-40 cm〉40-60 cm, but with the plough depth increase, the soil salinity content of 0-20 cm was down trend, the soil salinity content of 20-40 cm and 40-60 cm were rapidly rose trend, to plough depth 60 cm, the soil salinity content were 40-60 era〉20-40 cm〉0-20 cm. 60 cm of supernormal ploughed for drip irrigation cotton continuous cropping could effectively reduce soil bulk density of plough layer, improve soil moisture content of 0-20 cm, reduce soil salinity content, thus conducive to crop growth.