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1971年郑州市郊花园口公社引种紫云英,后来又引到中牟县刘集公社,但到1974年为止,每年都有大面积的死苗问题,仅少数地块引种成功。在引种成功的地块上和苕子比较,紫云英表现了很大的优越性,例如增产效果显著,播种省工,可以早播,春发较早,掩青容易,留种田腾茬早不耽误播春作物等。但是大面积的死苗问题得不到解决,在一部分干群中产生了“紫云英不耐冷,在北方过不了冬”的说法。针对这一问题,进行了定点观察和田间调查,找出了越冬死苗原因和北移成
In 1971, Zhengzhou Suburb Huayuankou commune introduced the milk vetch and later introduced it to Liuji Commune in Zhongmou County. However, until 1974, every year, there was a large area of dead seedlings and only a few plots were introduced successfully. In the successful introduction of land plots and prickly heat, asparagus has shown great advantages, such as a significant yield increase, sowing provincial workers, you can early sowing, spring hair earlier, cover the green easy to stay farming Tengcu early Do not delay sowing spring crops. However, the problem of large-scale dead seedlings can not be solved, and some cadres have produced the saying that “Chinese milk vetch is not cold and can not win the winter in the north.” In response to this issue, conducted a fixed-point observation and field surveys to identify the reasons for the winter overwintering and the North moved into