旱地春谷不同覆膜方式栽培效应及增产机理

Cultivation Effect and the Mechanism of Yield Increasing by Various Cover Patterns for Spring Millet in Dry Field

试验表明 ,覆膜穴播和膜际条播均能不同程度地提高谷田耕层土壤含水量及土壤温度 ,改善耕层土壤物理结构 ,创造更适宜谷子生长发育的环境 ,从而使谷子光合作用加强 ,叶面积、干物重增大 ,净同化率提高 ,生育进程加快 ,营养生长旺盛 ,成穗性、成粒性表现突出。覆膜穴播谷子比露地条播的增产 2 3.0 % ,增值 14.9% ,水分利用效率提高 2 .58kg/mm ;膜际条播谷子比露地条播的增产 13.4 % ,增值 7.3% ,水分利用效率提高 1.4 5kg/mm。

This test indicated that both the spot sowing and strip sowing with film cover could increase soil water content and soil temperature in the millet field in various extents, improve soil structure and provide suitable environment for millet growth, so as to strength photosynthesis, to increase leaf area, dry matter, and pure assimilatory efficiency, to promote to form more spikes and seeds. The yields increased 23.0% and 13.45% respectively by the spot sowing and by strip sowing with film cover than strip sowing without film cover, net income increased by 14.9% and 7.3%, and water utilization efficiency increased 2.58 and 1.45kg/mm respectively.