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杂草是宁夏农业生产的一大灾害,据1972年连湖农场的调查:水稻田每平方米有稗草54株,则稻谷减产23.8％;有208株则减产80％。可以设想,在引黄灌区350万亩农田中,若以120万亩低产田每亩因草害减产50斤计,则每年将减产6000万斤;中产田约200万亩,每亩因草害减产25斤计,则每年将减产5000万斤,如此概算,灌区每年因草害减产粮食估计不会少于1.1亿斤。由于杂草是经常性的为害,它造成的损失,毫无疑问,是大于病虫害和冷害的。因此,研究经济有效的杂草防除的综合技术措施,已成为我区发展农业生产,提高劳动生产率和降低成本等一项刻不容缓的任务。
Weeds are a major disaster in agricultural production in Ningxia. According to a survey conducted by Lianhu Farm in 1972, there were 54 barnyardgrass per square meter paddy fields, with a reduction of 23.8% in paddy rice and 208% in 80% reduction. It can be assumed that in the 3.5 million mu of irrigated farmland in the Yellow River irrigated area, if the output of 120 million mu of low-yield farmland is reduced by 50 kg per acre due to grass-planting, the annual output will be reduced by 60 million kg; the middle-yielding farmland will be about 2 million mu, Cut 25 pounds, then cut 50 million pounds each year, so estimated, irrigated area due to grass cut annual output of food is estimated not less than 110 million kg. As weeds are recurrent damage, the losses caused by it are undoubtedly greater than pests and diseases. Therefore, the comprehensive technical measures to study the economic and effective weed control have become an urgent task of developing agricultural production, improving labor productivity and reducing costs in our region.