各种作物缺镁的共同症状表现在叶片上是叶脉间发黄。象这样典型的症状在金冠、印度等品种上可以看到,而在国光上黄化现象几乎不出现,是直接变褐引起落叶。缺镁症状造成落叶是从新梢基部开始,这一点和药害是很容易区别的。落叶现象是从9月上旬渐趋严重。落 The common symptom of magnesium deficiencies in various crops is the yellowing of the veins between the leaves. Typical symptoms such as this in the Golden Delicious, India and other species can be seen, but in the country on the phenomenon of yellow almost does not appear, is a direct browning caused by deciduous. Magnesium deficiency symptoms caused by deciduous shoots from the beginning of the base, and this is very easy to distinguish between injury. Deciduous phenomenon is getting worse from early September. drop