The amount of fertilizer used in the greenhouse in autumn

Greenhouse vegetables have high multiple cropping index, high yield and large fertilizer demand. The base fertilizer has a great influence on the yield, quality and soil properties of vegetables. It is the most basic link in fertilization and is essential for the growth and development of vegetable crops. The following problems should be noted when applying the base fertilizer.

According to the target yield of vegetables, determine the amount of fertilizer applied to determine the amount of fertilizer applied to the greenhouse. The soil fertility and the amount of fertilizer required for vegetables must be considered. Generally 30% of the total nitrogen fertilizer, 80% of the phosphate fertilizer, and 50% of the potassium fertilizer are used as the base fertilizer, and the biological fertilizer and the micro-fertilizer are all applied as much as possible. For example, the yield of autumn oak is generally between 8,000 and 9000 kg. In this production range, for every 1000 kilograms of tomato produced, it needs to absorb 4.4 kg of nitrogen , 1.1 kg of phosphorus pentoxide , 4.8 kg of potassium oxide , and the ratio of NPK is 1 : 0.25 : 1.1 . More calcium and boron are needed. Wherein the fertilizer of high phosphorus fertilizer should be selected, the choice of phosphorus fertilizer top dressing. The amount of fertilizer to 40 to 50 kg is appropriate, generally NPK ratio of 1: 1: 0.75; amount of dressing 75 to 85 kg NPK ratio of 1: 0.2: 0.85.

Ensuring that the amount of organic fertilizer is sufficient for organic fertilizer (including farmyard manure, manure and cake fertilizer) is most suitable for base fertilizer application. For old greenhouses with high soil fertility, more attention should be paid to the application of some bio-organic fertilizers 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 change law of soil organic matter in greenhouse and the principle that the ratio of organic nitrogen to inorganic nitrogen is 1 : 0.4 to 1 when the yield is the highest, it is necessary to maintain the soil organic matter in greenhouses above 2.0% to ensure high yield, and organic matter should be applied every year. The organic fertilizer with a content of 30% is not less than 2000 kg / mu. If the soil organic matter content in greenhouses is to be increased year by year, the total amount of 30% organic fertilizer applied per year should exceed 2000 kg.

According to the weather and growth characteristics, the application method of the bottom fertilizer should be based on the large amount of crude organic fertilizer such as decomposed soil and manure, and the amount of crude organic fertilizer is 8 to 12 cubic meters per mu to increase soil organic matter and carbon material. a small amount of high bio-organic fertilizer (typically used in an amount of 100 to 150 kg) and potassium fertilizer slow-release 75 to 100 kg. Adopt release fertilizer base fertilizer to modulate the release rate of the nitrogen, to avoid the occurrence of flourishing high temperature, to prevent root diseases. After fruit setting, the whole element fertilizer containing nitrogen, phosphorus and potassium should be applied with water.