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紫云英是豫南稻区的主要绿肥作物。目前种植面积迅速扩大,已达到200多万亩,占稻田总面积的40%以上。在发展紫云英绿肥中,突出问题是第一年扩种的新茬田,特别是一些瘠薄田块生长很差,需要连种二、三年才能高产。农民称这种现象为:“头年瞎,二年差,三年发。”新茬田绿肥生长不良的主要原因之一,是土壤中缺乏与植株共生固氮的根瘤菌。据1964——1973年在20块紫云英田的苗期调查,有11块老茬田平均单株结根瘤32.1个,9块新茬田平均单株结根瘤16.1个,相差一半。为了解决这个问
Astragalus is the major green manure crop in southern Henan. At present, the planting area has rapidly expanded and has reached more than 2 million mu, accounting for more than 40% of the total paddy field. In the development of ShiYunYing green manure, the outstanding issue is the first year of new cropping expansion, especially in some poorly developed plots, which need even two or three years to produce high yield. Farmers said this phenomenon is: “blind for the first year, two years of poor, three years of hair.” New cropland green manure poor growth of one of the main reasons is the lack of soil rhizobia symbiotic nitrogen fixation plants. According to the survey of 20 Ziyunyingtian from 1964 to 1973, there were 32.1 nodules per plant on average for the 11 stubble fields and 16.1 nodules on average for the 9 new stubble fields, a difference of half. In order to solve this question