The first leaves of vegetables lacking nitrogen fertilizer showed light green or yellow (a small amount of lack), and soon the same changes were repeated in the stems. Changes in leaf color usually start with the old leaf and then gradually extend to the entire leaf cluster.
Phosphorus deficiency in vegetables initially showed slow growth, followed by chlorotic lesions on the leaves. The stems were slender, rich in wood, small leaves, dark leaves, red purple on the back, delayed fruit ripening and fruit ripening.
Potassium deficiency of vegetables has gray-green leaves at the base of the initial plants, followed by bronze and yellow-brown leaves, the leaf margin becomes brown, spots appear along the veins, tissue decay and death. Stalks are slender, hardened and rich in wood.
The lack of calcium in vegetables shows slow growth and the formation of thick woody stems. The top and young parts of the plants showed obvious symptoms. Tomatoes lack calcium, it is easy to get the umbilical rot, the specific performance of the top of the fruit (umbilical) began to appear brown rot, when severe, the whole fruit rot, sometimes accompanied by black mold. The lack of calcium in cucumber shows that the upper leaves are shriveled and do not stretch. The plant's leading growth is slow and dry.
If the lack of micro-vegetables in vegetables shows chlorosis between leaves and veins, erecting, the top is first affected and the growth is slow, indicating zinc deficiency. If the top growth point dies, the roots are stunted, and the flowering vegetables do not bloom well or bloom abnormally, indicating a lack of boron. If the newborn leaves have begun to lose their green color, they gradually fade into white, indicating that the iron deficiency.
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