Vegetables are hi-lime crops. Vegetable farmers generally pay attention to NPK when planting shed vegetables, and often ignore the application of calcium fertilizer. In the facility cultivation environment, the greenhouse soil is more likely to be deficient in calcium. Calcium deficiency has become one of the problems that affect the quality and yield of vegetables. So, how to make calcium for crops reasonably?
Choosing a variety of calcium fertilizers
Different calcium fertilizers have different properties. The pH value in the greenhouse soil is mostly 6.5-7.5, and alkaline or neutral fertilizer should be applied. Fertilizers such as lime and nitrogen contain calcium nutrients. Common phosphate fertilizers such as superphosphate, calcium magnesium phosphate and heavy superphosphate are also important sources of calcium fertilizer.
It is recommended to use calcium-containing medium-micro nutrient water-soluble fertilizer (containing not less than 120 g/L of calcium, not less than 20 g/L of magnesium, not less than 50 g/L of zinc, and not less than 3 g of boron. l), supplementing other medium and trace elements while supplementing calcium, pay attention to the use of fertilizer with low EC value (salt concentration), which is safer for crops.
The calcium application period should be reasonable
After the growth of vegetables into the prolonged period, the calcium nutrition of the soil began to decrease, and the calcium in the leaves began to decrease. At this time, the application of calcium fertilizer was the best period. Therefore, in order to prevent calcium deficiency in the early stage of vegetable growth, the base can be used. In the sheds that have been planted for many years, 2,000 to 3,000 kilograms of decomposed organic fertilizer is applied to the acre, and 30 to 45 kilograms of superphosphate is added.
Calcium supplement method should be appropriate
For the acidity of the open field or greenhouse vegetables, the method of re-application of the base fertilizer is adopted, that is, 100 kg of wood ash per mu or 50 kg of slaked lime can play the role of regulating soil pH. The specific method is to apply organic fertilizer and slaked lime or grass ash evenly to the surface, and then plough into the ground.
For vegetables in the growing season, especially when entering the vigorous growth period, the method of topdressing can be used to supplement calcium nutrition. Generally, 40 to 60 kilograms of slaked lime per acre is used. The amount of lime in sandy soil is appropriately reduced, not only can calcium supplement, but also It is beneficial to neutralize soil acidity, increase pH and improve soil aggregate structure. For the land of the cover film, one end of the film can be uncovered, and a groove of 10 cm is opened. 80 kg of slaked lime or 50 kg of ash is applied to the bottom of the ditch and watered, and the cover film is covered after the underwater seepage. It is also possible to use deep-plowing and mulching cultivation methods to enhance soil water retention and fertilizer retention while maintaining relatively stable water, thereby reducing calcium loss.
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