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在生产中有时会发现小麦苗期底叶发黄现象,特别是在气温低、土壤墒情差、常年不施有机肥料、土壤肥力较低的地块上比较明显。这种小麦比正常小麦减产15～30%。为了找出麦苗底叶黄枯的原因及预防措施,我们进行了两年调查和试验,基本明确麦苗底叶黄枯是一种氮素营养缺乏症。麦黄底叶黄枯是指4～5个叶片时,根系发育正常,但叶片呈淡绿色,细长,底叶1～2叶片从尖开始变黄,逐渐向叶基部扩展,最后叶片黄枯而死亡。据我们试验,这种小麦施用适量的速效性氮肥作种肥或早期追施氮肥,就能防止麦苗出现底叶黄枯现象。小麦分蘖期正是穗分化阶段,植物体干物积累的速度加
Occurred in the production of yellow leaves at the end of the wheat seedling phenomenon, especially in the low temperature, poor soil moisture, perennial non-organic fertilizer, low soil fertility of the land is more obvious. This wheat yields 15 to 30% less than normal wheat. In order to find out the reason and precautionary measures of wheat leaf bottom yellowish yellow, we conducted two years of investigation and experiment, the basic clear wheat yellow bottom leaf is a nitrogen deficiency syndrome. Yellowish yellowish brown leaf refers to 4 to 5 leaves, the root system is normal, but the leaves were light green, slender, 1 to 2 leaves from the tip of the leaves began to yellow, and gradually extended to the base of the leaves, the last yellow leaves withered And death. According to our experiments, this kind of wheat can be used to prevent yellowish yellowing of barley seedlings by applying appropriate amount of quick-acting nitrogen fertilizer as seed fertilizer or early nitrogen fertilizer. It is the ear stage of wheat tillering stage, plant dry matter accumulation rate plus