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丽水地区农科所王仲明来稿,反映丽水地区最近三年来,连续出现部分麦苗受冻死胎以及他们如何采取预防和补救办法的情况。王仲明来稿说,大小麦拔节以后,抗寒能力明显减弱,这时如遇低温气候,如零下2～5℃,幼穗就易造成冻害死胎。丽水地区农科所曾对这三年来的最低气温,1978年2月18日的零下3.5℃,1979年2月1～2日的零下3.4℃,今年1月31日的零下4.9℃,进行了调查,结果发现凡进入雌雄蕊分化期的麦苗,无论什么品种都发生了受冻死胎现象。对于麦苗死胎的诊断,作者作了具体介绍,因为在浙南山区的气候条件下,受冻植株一般只是幼穗死亡,而基部幼茎仍然活着,所以茎叶仍然保持绿色,几乎与正常植株无异,人们易被假象蒙蔽。但仔细观察,因生长点冻死,心叶不再伸长,卷成喇叭形,少数枯萎发黄,新叶不增加,老叶变浓
Wang Zhongming, director of the Lishui Agricultural Research Institute, made a presentation reflecting the continuous occurrence of frozen fetal remains of some wheat seedlings in Lishui in the recent three years and how they have taken preventive and remedial measures. Wang Zhongming’s submission said that after the wheat and wheat have been weakened, the ability to deal with cold has obviously weakened. In the case of a low-temperature climate, for example, a temperature of minus 2 to 5 ℃, young ears will easily cause frostbite to be stillborn. The Lishui Agricultural Science Institute conducted a survey on the minimum temperature in these three years, minus minus 3.5 ℃ on February 18, 1978, minus 3.4 ℃ on January 1-2, 1979 and minus 4.9 ℃ on January 31 this year Survey, the results found that where the stamen into the wheat seedling stage, no matter what species have occurred in the phenomenon of frozen stillbirth. The author made a detailed introduction to the diagnosis of the fetal death of wheat seedlings because the frozen plants usually only young ears died while the young stems were still alive at the base of the mountain in the southern part of Zhejiang Province. Therefore, the stems and leaves remained green almost unchanged from the normal plants Different, people are easily deceived by illusion. However, careful observation, due to the growth of frozen to death, the heart is no longer elongated leaves, rolled into a trumpet, a few withered yellow, new leaves do not increase, the old leaves thicken