Calcium deficiency. The plants are short, with premature aging, the vegetative growth at the stem end is slow, and a thick woody stem is formed; the lateral apex is dead, showing a knob-like process, the young leaves are curled, and the leaf edge turns yellow and dies of green and then comes inward from the tip and leaf margin. Death; plant top bud necrosis, while old leaves are still green. Remedy: Foliar application of calcium fertilizer.
Magnesium deficiency. Occurs later in childbirth. The appearance of the old leaf mesophyll was yellow and the veins were still green, with lesions appearing, and they migrated to the site of new tissue until they died. Remedy: Foliar spraying with 0.2-0.5% magnesium sulfate solution per acre.
Sulfur deficiency. There was almost no abnormality in the whole plant growth, but the leaf color of the middle and upper leaves became pale, and the symptoms of sulfur deficiency and nitrogen deficiency were basically similar, but the nitrogen deficiency was the lower position yellowing, and the lack of sulfur was the upper leaf chlorosis. The upper lobar yellowing is similar to the iron deficiency, but the veins do not show the symptoms of curling, dead leaves, and dwarfism when the iron deficiency occurs; if the leaves show mosaicism, they may be caused by viral diseases. Remedy. Change fertilizers containing sulfur, such as ammonium sulfate, potassium sulfate and so on.
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