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一、缺氮症状:缺氮型黄苗表现为幼苗细弱,株矮、蘖少、叶窄、叶色淡绿,以后发展为叶尖干枯,然后由叶尖开始向下干枯,并逐渐由下向上发展,后期根量少穗数少,穗子小成熟早,产量低。诊断要点:仔细观察,如果从下位叶开始黄化则可能是缺氮。注意茎的粗细和根的颜色,一般缺氮茎细根白。注意下位叶缘急剧黄化为缺钾,边缘部分残留有绿色缺镁,这两种情况不是缺氮。叶黄白天萎蔫,可以考虑其他原因如干旱、根病等。
First, the nitrogen deficiency symptoms: yellow nitrogen-deficient seedlings showed weak, short plants, tillers, narrow leaves, leaf color light green, after the development of the tip dry, and then began to dry down from the tip and gradually from the next Upward development, the late number of spikelets less, ears early mature, low yield. Diagnostic points: careful observation, if yellowing from the lower lobe may be nitrogen deficiency. Pay attention to the thickness of the stem and root color, the general lack of nitrogen stem fine root white. Note that the lower edge of the sharp yellowing of potassium deficiency, the edge of the left part of the green magnesium deficiency, the two cases is not a lack of nitrogen. Ye Huang wilting day and day, you can consider other reasons such as drought, root disease and so on.