First, fertilizer varieties. Different calcium fertilizers have different properties. At present, the soil pH of winter greenhouses is mostly below 6.5, which is acidic. The open soil pH is 6.5-7.5, so use alkaline or neutral fertilizers, such as grass ash, slaked lime, calcium nitrate, etc., and use less acidic or physiological acidic fertilizers, such as calcium sulfate, calcium chloride, so as not to increase the acidified soil environment Affect the normal growth and development of winter greenhouse vegetables.
Second, fertilization period. According to the characteristics of the soil, the growth of vegetables in greenhouses under 3 years of continuous planting is generally less. The nutrients released from the base fertilizer and the mineralization of the soil itself can meet the needs of its growth and development. The soil calcium can maintain a higher level. At the same level, many years of experiments have shown that only when vegetables grow into the season, the calcium nutrients in the soil begin to decrease. At the same time, the content of calcitonin in the leaves is gradually reduced to the level of the growth period. At this time, fertilization is the optimal period for fertilization of vegetables. Calcium fertilizer can not only increase the yield and quality of vegetables, but also improve the resistance of vegetables. If the soil is of low pH, basic treatment can be adopted. Generally, the pH value of greenhouses continuously planted for more than 5 years is less than 6, and calcium basal fertilizer should be used in combination with basal fertilizer.
Third, the amount of fertilizer. The amount of application is also the key to attention in the production of vegetables. Too much dosage causes waste, and too little can not achieve the effect of increasing yield. Generally, 15-20 kg of calcium nitrate should be applied on 1/15 ha; or 40-50 kg of ash. Or according to the soil acidity (pH less than 6.0) application of slaked lime 30-50 kg, can achieve the purpose of improving production and improving quality.
Fourth, fertilization method. One for basic application: Applying 30-50 kg of mature lime or 40-50 kg of plant ash in combination with organic fertilizer before the shed, has obvious effect on adjusting the pH of the soil. The specific method is to mix the organic fertilizer with hydrated lime or ash, and evenly spread it. Cultivate on the ground after the ground. Two for top dressing: The specific method is to select the clear film on the sunny side of the morning and open the ditch depth by 10 cm. Apply the fertilizer to the bottom of the trench and water it until the water seeps through the cover film, or directly pour the fertilizer. Fertilizer is dissolved in water at a rate of 1 kg per 100 kg of water, and the trench is chased after the water is poured to cover the soil. It is also possible to combine the disease-prevention spraying with foliar dressing in the form of topdressing. The top dressing concentration is generally 0.3%-0.5%, and the effect is also good. Generally, 300 times amino acid calcium or 0.1%-0.2% calcium nitrate or 1% superphosphate can be sprayed. Spray every 15 days or so, spray 3-5 times.
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