The effects of no-tillage with maize stalk mulched on soil environment in dryland

Under the condition of no-tillage with more than 4500kg/hm² of maize stalk mulched,increments of maize yields was 22.15%～25.65%,water use efficiency of soil moisture increased 2.9625kg/hm²·mm.Comparing the treatments of no-tillage with mulch to the traditional tillage,the contents of available quick-moving water in 0～200cm soil layers increased 17.02～47.9mm before spring sowing.There was a significant negative correlation between earth cumulative temperature in 5cm,10cm,15cm soil layers and the amounts of stalk mulched;the more the mulch amount was,the less the volume weight in 0～10cm soil layers was;the significant relations of linear regression were formed among organic substance,total N,available P and mulch amounts.Comparing the treatments of no-tillage with mulch to the traditional tillage,amounts of ureaes,basic phosphatase,invertase were increased by 0.04～0.48mg/g,0.05～1.08mg/g and 1.7～12.8mg/g;there was a significant linear correlation between the amount of this three enzymes and the amounts of mulch.