玉米二元覆盖农田水分动态及水分利用效率研究

旱地玉米采用垄面覆膜、垄沟覆不同用量麦草的二元覆盖试验结果表明:随麦草覆盖量的增加土壤保墒效果明显;其中0~100cm土层土壤玉米全生育期累积贮水量5250kg/hm2和9750kg/hm2的麦草覆盖处理比垄面覆膜垄沟未覆麦草处理平均增加146.2mm,水分利用效率提高16.67%~28.65%,降水利用率提高12.39%~18.29%,玉米增产12.10%~18.15%。

Soil water content dynamics and water use efficiency under plasticfilm and straw dual-mulching in maize fields

Experiments were conducted on plasticfilm and straw dual-mulching in dry land maize fields with plastic film mulch on ridges and different amount wheat straw mulch in channels. The results show that soil water content increases with increased amount of straw mulch. Soil water content within 0-100cm depth averagely increases by 146.2mm under treatments of 5250kg/hm^2 and 9750kg/hm^2 straw mulch during the entire growth period of the crop. Water use efficiency of maize with plastic film and straw dual-mulching increases by 16.67 % -28.65 %, precipitation retention efficiency increases by 12.39% - 18.29%, and maize yield increases by 12.10% -18.15%, in comparison with only plastic film mulch on ridges.