The Effects of No tillage with Mulch on Soil Environment for Maize Dryland

Under the condition of no tillage with mulch which amount was above 4 500 kg/hm 2, increase of corn yields was 22.15%~25.65%; the water utilized coefficient of soil can increase 2.962 5 kg/ (mm·hm 2); compared the treatments of no tillage with mulch to the traditional tillage, the contents of quick moving available water in 0~200 cm soil layers can increase 17.02~47.9 mm before spring sowing. There was a significant negative correlation between earth cumulative temperature in 5, 10,15 cm soil layers and the amounts of stalk mulch;the more the mulch amounts were, the less the volume weight in 0~10 cm soil layers was; the significant relations of linear regression were formed between organic substance, total N, available P and mulch amounts. Compared the treatments of no tillage with mulch to the traditional tillage, amounts increased of urease, basic phosphatase, invertase were 0.04~0.48 mg/g, 0.05~1.08 mg/g and 1.7~12.8 mg/g; there was a significant linear correlation between the three kinds of enzyme and the amounts of mulch.