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几种间套作方式美国俄克拉何马州试验站进行高粱和棉花套种,研究防治棉虫的作用。因为高粱是棉铃虫天敌活动的一个适宜场地,包括瓢虫、草蛉和蜘蛛等。当用4行高粱与12行棉花间作时,棉花上天敌昆虫大量出现,对棉铃虫的控制效果比喷药还好。间作不喷药的棉田比同等面积单作喷药棉田增产24%。高粱的产量和质量都是上等。把高梁改成玉米的效果就不行。加拿大研究出玉米和甜菜间作的方式,便于机械操作。即玉米种南北行,行距40吋(折合92厘米),甜菜种在玉米行里。到快成熟的时候,用机器将整片地的茎叶收获作育贮,青贮物(包括甜菜的地
Several intercropping method Oklahoma State Experimental Station Sorghum and cotton intercropping, the role of prevention and control of cotton insects. Sorghum is a suitable site for activities of cotton bollworm natural enemies, including ladybugs, weeds and spiders. When 4 lines of sorghum and 12 lines of cotton intercropping were used, a large number of natural enemy insects appeared on the cotton and the control effect on the bollworm was better than spraying. The intercropping of non-sprayed cotton fields increased the yield by 24% over the same area of single-sprayed cotton fields. Sorghum yield and quality are the best. The effect of the corn into the sorghum will not work. Canada has developed a way to make between corn and sugar beets for easy mechanical operation. That corn species north-south line spacing 40 inches (equivalent to 92 cm), beet varieties in the corn line. By the time of maturity, the whole plant stem and leaves are harvested and silage harvested (including sugar beets)