Vegetables are hi calcium crops. Vegetable growers generally pay attention to nitrogen, phosphorus and potassium when planting greenhouse vegetables, but they often neglect the use of calcium fertilizers. In the facility cultivation environment, the greenhouse soil is more likely to lack calcium. Calcium deficiency has become one of the serious problems affecting the quality and yield of vegetables. So how do you rationally add calcium to crops?
Choose calcium fertilizer varieties
Different calcium fertilizers have different properties. The pH in the greenhouse soil is mostly 6.5-7.5, and alkaline or neutral fertilizers should be used. Lime nitrogen and other fertilizers contain calcium nutrients. Common phosphorus fertilizers such as superphosphate, calcium magnesium phosphate, and heavy superphosphate are also important calcium sources.
It is recommended to use calcium-containing trace nutrient water-soluble fertilizer (not less than 120g/L for calcium, not less than 20g/L for magnesium, not less than 50g/L for zinc, not less than 3g for boron, etc.) L)) Calcium is supplemented with other trace elements at the same time. Attention should be paid to the use of fertilizers with low EC (salt concentration) to make crops safer.
It is reasonable to apply calcium
After the vegetable grows into a prosperous period, the soil calcium nutrition begins to decrease, and the calcium in the leaf begins to decrease. At this time, the calcium fertilizer is the best period. Therefore, in order to prevent calcium deficiency in the early stage of vegetable growth, basic application may be adopted. In greenhouses planted for many years, generally, 2000-3000 kg of decomposed organic fertilizer is applied to Mushi, and then superphosphate is added to 30-45 kg.
Calcium method should be properly
For heavier exposed or greenhouse vegetables, the method of reapplying basal fertilizer, ie, applying 100 kg of wood ash per acre or 50 kg of hydrated lime, can be used to regulate the pH of the soil. The specific approach is to apply organic fertilizer with hydrated lime or ash uniformly on the surface, and then turn it into the ground.
For growing vegetables, especially when it enters a vigorous growing season, calcium fertilizer can be added by top-dressing methods. Generally, 40 to 60 kilograms of slaked lime are used per mu. The amount of lime used in sandy soil is appropriately reduced. It can not only supplement calcium, but also It will help neutralize the acidity of the soil, increase the pH, and improve the structure of the soil pellet. For the covered land, one end of the membrane can be uncovered, a ditch of 10 cm in depth can be opened, and 80 kg of mature lime or 50 kg of vegetation ash can be applied to the bottom of the ditch and then watered. After the subsurface is infiltrated, the earth cover film is applied. The method of deep plowing and mulching can also be used to enhance the ability of the soil to retain water and fertility, while keeping the water relatively stable, thereby reducing the loss of calcium.
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