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棉花采用营养钵育苗移栽,同直播相比,不仅可促进早发、生育期提前,产量增1～3成,而且可解决两熟矛盾,确保全苗,充分发掘棉花种植效益。但随之出现了苗床杂草发生量大,难以人工拔除的问题,不利于培育早、大、壮苗。为此,在1989～1994年间笔者对棉花营养钵苗床杂草的发生和药剂应用作调查试验,以适应棉花高产栽培技术要求。1 苗床杂草发生和危害1.1 发生特点 由于棉花苗床钵土和盖土均取自肥沃的表土,草籽含量大,而苗床播种盖膜后其小气候特点是高温高湿(晴天温度比外界平均高出7.4～16.0℃;播种前钵体浇足水分,前期湿度亦比大田
Compared with direct seeding, cotton can not only promote early emergence and early growth period, but also increase the output by 1 to 3 percent. The contradiction between the two crops can be solved to ensure the whole plant and fully exploit the benefits of cotton planting. However, the emergence of a large number of bed weeds, difficult to manually remove the problem is not conducive to nurturing early, big, strong seedlings. To this end, in 1989 to 1994 I cotton seedling bed weed incidence and application of pesticides for investigation and testing to adapt to high-yielding cotton cultivation techniques. 1 seedbed weeds occurrence and harm 1.1 Occurrence characteristics Because the cotton seedbed bed soil and cover soil are taken from the fertile topsoil, grass seed content, and seedbed seeding after the film is characterized by its microclimate is high temperature and humidity (sunny days than the average high temperature A 7.4 ~ 16.0 ℃; before pouring bowl of water, pre-planting humidity than the field