To re-apply base fertilizer light fertilizer fertilizer greenhouse vegetable production should master the application of base fertilizer, the principle of less top dressing, generally the proportion of basic fertilizer should account for about 70% of the total amount of fertilizer, which phosphate decomposition due to slow, can be increased to 70%. The nitrogen and potassium fertilizers should be 50%. High-quality farmhouse compost and manure must be fully decomposed, with a consumption of about 5,000 kilograms per acre, and high-quality organic compound fertilizer is generally 75 kilograms per acre, which should not exceed 100 kilograms. The rest of the top dressings are flexibly controlled according to the growing trend of the vegetables and the regular period of fertilizer requirements.
Fertilizer to open the ditch deep application of greenhouse vegetables because of the high degree of confinement, shallow fertilization or spreading fertilizer material is easy to make the fertilizer volatile, both reducing fertilizer efficiency and easy to produce ammonia hazards. When topdressing, a key point is applied or applied. The depth is 5-6 cm, and the second is to maintain a distance of 8-10 cm from the root of the vegetable.
To grasp the temperature-appropriate topdressing nitrogen fertilizer, especially urea and ammonium bicarbonate can only be easily absorbed by vegetables when they are converted into nitrate nitrogen, and the external factor of absorption is temperature conditions. When the temperature in the greenhouse is lower than 15°C, nitrifying bacteria and Activities will be suppressed. Therefore, topdressing nitrogen fertilizer should be carried out before and after noon on sunny days. If it is too early or too late, the effect of topdressing will be reduced due to low temperature. For nitrogen-deficient vegetables or leafy vegetables such as spraying 0.5% -1.0% concentration of urea solution will be better.
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