(1) Nitrogen deficiency: The whole plant has poor growth, and the leaf color is light green, especially the lower leaf color is lighter. (2) Phosphorus deficiency: Dark green leaves with purple color, slow growth, dwarfness, thinness, erectness, underdeveloped roots, poor fruit ripening, and small fruits. (3) Potassium deficiency: Irregular chlorotic spots occur on the leaf surface, and then the spots become necrotic. If the potassium is insufficient during the fruit's inflated period, the leaf margins of the lower leaves of the plants rapidly lose their green color and some of them die. (4) Magnesium deficiency: In the early stage of magnesium deficiency, the growth of the whole plant was normal, but the lower leaves became chlorotic, and there were brown or purple spots or stripes with different sizes. (5) Deficiency of zinc: The whole plant grows poorly, the leaves become smaller, the veins between the veins become yellowish, and the internodes shorten, forming clustered leaflets, which have a feeling of total atrophy. Generally more common in corn. (6) Calcium deficiency: The parietal lobe is nearly dead, the leaf margin is withered or cracked, high temperature, nitrogen fertilizer is prone to calcium deficiency, and the common tomato umbilical rot and cabbage dry heart. (7) Boron deficiency: The parietal lobe is nearly dead, the leaf margin is chlorotic, the common radish root is browning, and the celery petiole is transversely split. (8) Iron deficiency: The plant growth is not bad. In the early stage of iron deficiency, the first loss of leaf part becomes light green, yellowish green, yellow, or even white-green, while veins remain green, forming a net, with iron deficiency time. Prolonged or aggravated, the veins of the veins gradually faded and disappeared, leaving the entire leaf yellow or white, sometimes with tan spots, and finally the leaves of the twigs died, plant growth stagnated and died. During the high temperature and rainy season in summer, fruit trees thrive and temporary iron deficiency disorders often occur.
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