Calcium deficiency Symptoms: Calcium deficiency occurs at the seedling stage, a large number of dark spots appear at the base of the germinal leaves, yellow spots appear at the edge of the germinal leaves, and the terminal buds are necrotic, and the cotyledons become thick and curled. The leaf margins of the primary leaves shrink, the leaves become cups, and dark spots appear at the tips of the leaves. The lack of calcium within one month before flowering caused blue spots on the edges of the three leaves of the base. The leaves were dark green, and the leaves were densely integrated with wrinkles, and the woody parts of the stems were softened. In the crusting stage, calcium deficiency, yellow-green leaves, and with red or lavender, capsule dark green or brown-green, with markings, leaves off delay. Calcium-deficient plants are weak and susceptible to disease.
Causes of calcium deficiency occur in soils with acidic, sandy, and organic fertilizers.
Remedial methods Lime is applied to the calcium-depleted acid soil, and gypsum is applied to the yellow-calcareous alluvial soil, which significantly increases the yield. Calcium fertilizer can be used as base fertilizer, but it can also be applied at the early flowering stage. Alkaline lime should be used on acidic soils, generally 15 to 25 kg per mu. In saline-alkali soil and calcareous soil, it is appropriate to use physiological alkaline fertilizer gypsum, generally 20-30 kg per mu.
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