Technology of applying calcium fertilizer in vegetables in winter greenhouse

In the winter greenhouse vegetables production, the rational use of calcium fertilizer, generally can increase production by 10% to 26.5%, per 1/15 hectares (1 acre) to increase income from 800 to 1,000 yuan. Here are some of the issues that should be considered when applying calcium fertilizers:

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 value 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 consumption leads to waste. Too little can not achieve the effect of increasing production. Generally, 15 to 20 kg of calcium nitrate should be applied at 1/15 hectare, or 40 to 50 kg of plant ash. Or according to the soil acidity (pH less than 6.0) application of 30 to 50 kg of slaked lime, can achieve the purpose of improving production and improving quality.

Fourth, fertilization method. One for basic application: Applying 30 to 50 kilograms of mature lime or 40 to 50 kilograms of plant ash in combination with organic manure before the shed, which has obvious effects on the regulation of soil pH. The specific method is to mix the organic manure with hydrated lime or plant ash and evenly apply 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. Can also be combined with disease prevention and spraying the use of foliar fertilizer in the form of top dressing, top dressing concentration is generally 0.3% ~ 0.5% is appropriate, the effect is not bad. Generally, 300 times amino acid calcium or 0.1% to 0.2% calcium nitrate or 1% superphosphate can be sprayed. Spray about once every 15 days, even spray 3 to 5 times.

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