Calcium can promote the formation of cell walls, thereby ensuring the stability of plant tissues. When calcium is deficient, the cell wall cannot form normally, the cell nutrients extravasate, and death occurs. Therefore, symptoms such as umbilical rot, cracking, rotten head, heartburn, water heart, and heart rot are more likely to occur. Calcium deficiency can also cause poor root growth, a small number of root hairs, and even serious calcium deficiency can cause root death.
Calcium is the most difficult of all nutrient elements to be absorbed by the root system. Not only is it easily fixed by the soil, but also after entering the plant, calcium can only be conducted with water through the catheter, making it easier to concentrate on the leaves with strong transpiration On the other hand, the growth point and fruit transpiration are weak, and calcium fertilizer conduction is low. When calcium deficiency occurs, it is first displayed on the growth point and fruit.
In the summer season, the high temperature and dry shed environment has become the norm. It is recommended that vegetable farmers reduce the temperature in the shed by setting up a sunshade net, spraying a cooling agent, covering crop straw in the operation line, or watering frequently. Watering should be balanced when watering, only to maintain proper soil moisture can promote calcium absorption.
Once the vegetables appear dry tips, umbilical rot disease and other calcium deficiency symptoms, vegetable farmers should add calcium fertilizer in time on the basis of taking the above measures.
Young parts are susceptible to calcium deficiency. Vegetable farmers should focus on spraying young parts of plants when applying calcium supplements to foliage. For example, when adding calcium to the leaf surface, focus on spraying at a distance of 30 cm below the growth point of the shoot tip, and focus on spraying young fruit at the same time. The appropriate calcium application period is after the formation of young fruit.
The demand for calcium fertilizer is large, and it is difficult to meet the needs of vegetable growth by foliar fertilizer alone. For areas with severe calcium deficiency, it is also necessary to pay attention to the application of a variety of calcium-containing fertilizers, such as calcium nitrate, calcium magnesium phosphate fertilizer, superphosphate, etc. .
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