Determine the amount of fertilizer based on the target yield of vegetables
To determine the amount of fertilizer applied to the greenhouse, we must consider the level of soil fertility and the amount of fertilizer needed for vegetables. Generally, 30% of the total amount of nitrogen fertilizer, 80% of phosphate fertilizer, and 50% of potassium fertilizer are used as base fertilizer. Biological fertilizer and microelement fertilizer are all applied as much as possible at one time. For example, the yield of tomato in the autumn is generally between 8,000 and 9,000 kilograms. In this output range, it needs to absorb 4.4 kg of nitrogen, 1.1 kg of phosphorus pentoxide, and 4.8 kg of potassium oxide per 1,000 kg of tomato. The ratio of nitrogen, phosphorus and potassium is 1:0.25:1.1, and more calcium and boron are needed. The base fertilizer should be selected for high-phosphorus fertilizers, followed by low-phosphorus fertilizers. The amount of basic fertilizer is 40-50 kilograms, and the ratio of N, P and K is 1:1:0.75. The amount of nitrogen-phosphorus-potassium is in the ratio of 1:0.2:0.85.
Ensure sufficient organic fertilizer
Organic manure (including farmyard manure, manure fertilizer, and cake manure) is most suitable for base fertilizer application. For older greenhouses with higher soil fertility, more organic biofertilizer should be used as base fertilizer. To maintain soil fertility and organic matter in the shed without reducing or slightly increasing, organic fertilizer must be added to the greenhouse soil. According to the rule of soil organic matter in greenhouses and the ratio of organic nitrogen to inorganic nitrogen in the ratio of 1:0.4 to 1:1, the maximum yield is to be calculated. To maintain the soil organic matter content in greenhouses higher than 2.0% to ensure high yield, organic matter should be applied every year. Organic fertilizer with a content of 30% is not less than 2000 kg/mu. If the soil organic matter content in greenhouses should be increased year by year, the total amount of 30% organic fertilizer applied every year should be more than 2000 kg.
Determine base fertilizer application method according to weather and growth characteristics
When base fertilizers are applied, large-scale crude organic fertilizers such as rotten compost and manure are mainly used, with the amount of 8-12 cubic meters per acre to increase soil organic matter and carbon materials, together with a small amount of high-quality bioorganic fertilizer 100-150 kg) and slow-release potassium sulfate compound fertilizer 75-100 kg. Controlled-release fertilizers are used to regulate the release rate of nitrogen fertilizers in the base fertilizers to avoid the occurrence of high temperatures and prevent root diseases. After fruit set, the whole element fertilizer containing N, P and K must be applied with water.
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