Regulating basic fertilizer to top-dressing In order to prevent one-time fertilization, the amount of fertilizer should be sufficient to apply basic fertilizer and timely fertilizer. The proportion of common basal fertilizer should account for 60% of the total amount of fertilizer, and phosphate fertilizer can be increased to 70% due to its slow decomposition. Nitrogen and potassium fertilizers should be 40%. High-quality farmhouse compost and manure should not exceed 5000 kg per mu. High-quality organic compound fertilizer is generally 75 kg per acre and should not exceed 100 kg.
The application of organic fertilizers for organic fertilizers can improve the soil, increase the ability to retain fertilizers and retain water, enable steady release of fertilizers, and also regulate the pH of the balanced soil. In addition to the use of farmyard-built fertilizers, bio-organic fertilizers and the production of active organic fertilizers such as Huimanfeng and Diledan should be strongly promoted. This kind of organic compound fertilizer can supply a large number of elemental fertilizers and various trace elements, supplement organic matter to improve the soil, inhibit the damage of some diseases and insect pests in the soil, and avoid the occurrence of fertilizer damage due to concentrated fertilizer supply in the soil.
It is forbidden to use light greenhouse vegetable crops because of tight confinement. It is easy to make the fertilizer evaporate by shallow fertilization or spreading of fertilizing materials, which reduces both fertilizer efficiency and ammonia hazards. When applying fertilizer, a key point is applied or applied, and the depth is 5-6 cm. The second is to maintain a distance of 8 to 10 cm from the vegetable roots.
The topdressing nitrogen nitrogen fertilizer, especially urea and ammonium bicarbonate, can only be absorbed by vegetables only when it is converted into nitrate nitrogen, and the external factor of the speed is the temperature condition. When the temperature in the greenhouse is lower than 15°C, the nitrifying bacteria and activity Will be suppressed. Therefore, topdressing nitrogen fertilizer should be selected before and after noon on sunny days, too early or late will reduce the effect of top dressing due to low temperature. Advocates to use 0.5% ~ 1.0% concentration of urea solution above 15 °C fertilization.
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