甘肃省不同旱作区全膜双垄沟播玉米增产效果研究

Effects of Ditch Sowing in Corn Double Ridge Mulched with Plastic Films in Different Dryland Areas of Gansu

对甘肃省不同旱作区全膜双垄沟播玉米增产效果的研究结果表明,在不同旱作区,全膜双垄沟播的增产效果均极显著高于半膜双垄沟播,半膜双垄沟播显著高于半膜平铺穴播;以秋季覆膜的增产效果最好,顶凌覆膜次之,播前覆膜最低。不同旱作区全膜双垄沟播玉米的增产效果从大到小依次为半干旱偏旱区、半干旱区、半湿润偏旱区。

The yield-increasing effects was studied which the techniques of ditch sowing in corn double ridge mulched with plastic films in different dryland areas. The results showed that different film mulching modes, yield-increasing extent of whole mulching on double ridge was significantly higher than that of half mulching on double ridge, and half mulching on double ridges was remarkably higher than half flat mulching; different film mulching times, yield-increasing extent of autumn mulching was much higher than that of early spring mulching, and early spring mulching was much higher than sowing mulching. The yield-increasing degrees of whole mulching on double ridges in semi-arid to the arid side areas were evidently higher than those in semi-arid area, and semi arid areas were evidently higher than semi-humid to the arid side areas.