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It is not advisable to use chlorine-based fertilizers. It is not advisable to use volatile nitrogen fertilizers to determine fertilization. The length and length of vegetables should be considered. Generally, the vegetables with short growth period or roots, stems and leaves are harvested. 1/2~1/3 of nitrogen fertilizer, all phosphorus, potassium and micro-fertilizer can be used as base fertilizer, and the other nitrogen fertilizer is used for topdressing in the growth stage. Apply. For melons and fruits, 1/3 nitrogen fertilizer, 2/3 phosphorus and potassium fertilizer, and all micro-fertilizer can be used as base fertilizer, and other nitrogen fertilizer and phosphorus-potassium fertilizer are applied as top dressings. If the salt content of the plot is between 0.2% and 0.3%, it is not appropriate to apply the fertilizer as the base fertilizer.
Re-application of organic fertilizer, deep-cultivation of mixed soils year by year, selection of high-quality organic fertilizers that have been rotted and used as base fertilizers for about 1 month before the shed, the application rate is generally 1~1.5 times that of Daejeon, that is, 3000~10000 kg per mu, and yearly Deep tillage, thickening the tillage layer, to achieve the integration of soil and fertilizer, improve the physical and chemical properties of the soil.
In order to prevent poisoning of ammonia and nitrous acid gas, application of organic fertilizer should be decomposed, especially chicken manure, requiring high degree of maturity and early application. It is strictly forbidden to stack in the shed for a long time. The organic fertilizer can be combined with the inorganic fertilizer, and if a part of the inorganic fertilizer is extracted for foliar spraying, it is more economical.
In the greenhouse, how to determine the appropriate irrigation period, irrigation temperature, irrigation amount and irrigation method is the key to achieve reasonable irrigation. For greenhouse irrigation water, the water temperature should be maintained at 20 °C ~ 25 °C, more than 28 °C will damage the vegetable roots, causing greenhouse vegetable diseases.
Practically solve the salt damage. For plots where salt damage has occurred, it can be solved by applying organic fertilizers by selecting salt-tolerant vegetables such as cabbage, spinach, pumpkin, celery and broccoli. It is also a very effective method to remove soil or remove salt.
Sunlight greenhouses and plastic greenhouses often cause excessive leaching due to excessive fertilization, and there is no natural precipitation to cause leaching, resulting in a constant increase in salt concentration in the soil. Standardized fertilization is an effective way to prevent the accumulation of salt in the greenhouse.
Anti-season vegetable fertilization attention points
Determine the amount of fertilization to determine the amount of fertilizer to meet the demand of vegetables, should be calculated according to the level of production, soil fertility level, such as soil nitrogen, phosphorus, potassium nutrient supply can meet the needs of vegetables, in order to ensure the strength of fertilizer, according to vegetables The amount of fertilizer applied is 20%~40% of the output. At present, the fertilization level should be controlled by nitrogen, phosphorus, and potassium, and the targeted application of micro-fertilizer is the principle of fertilization.
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