In order to improve the fertilization level of shed vegetables in the early spring growth stage, the following four points should be noted in the technical aspects:
First, regulate the base fertilizer topdressing. In order to prevent the amount of one-time fertilizer from being too large, the base fertilizer should be applied and the fertilizer should be applied at the right time. Generally, the proportion of base fertilizer should account for 60% of the total fertilizer application, and the phosphate fertilizer can be increased to 70% due to slow decomposition. The fertilizer for nitrogen and potassium should be 40%. High-quality farm compost and manure should not exceed 5000 kg per mu. High-quality organic compound fertilizer is generally 75 kg per mu, and should not exceed 100 kg.
Second, increase the application of organic fertilizer. Organic fertilizer can not only improve the soil, improve the ability of retaining fertilizer and water retention, but also make the fertilizer release steadily, and also adjust the pH of the balanced soil. In addition to the application of fertilizers produced by farmers, it is also necessary to strongly promote the application of bio-organic fertilizers and refined organic fertilizers such as Huimanfeng and Diledan, which can supply a large amount of elemental fertilizers, various trace elements, and organic matter-improved soil. To inhibit the damage of some pests and diseases in the soil, and to avoid the occurrence of fertilizers in the soil.
Third, the shallow topdressing is prohibited. Due to the good degree of airtightness in greenhouse vegetables, shallow fertilization or spreading of fertilizers can easily cause the fertilizer to volatilize, which not only reduces fertilizer efficiency but also causes ammonia hazard. When topdressing, one must apply or apply a depth of 5-6 cm. Second, keep a distance of 8-10 cm from the root of the vegetable.
Fourth, suitable temperature to apply nitrogen fertilizer. Nitrogen fertilizers, especially urea and ammonium bicarbonate, are easily absorbed by vegetables only when converted to nitrate nitrogen. The external cause of temperature is temperature. When the temperature in the shed is lower than 15 °C, nitrifying bacteria and activities will be inhibited. Therefore, the topdressing nitrogen fertilizer should be selected around noon on a sunny day, too early or too late will reduce the effect of topdressing due to low temperature. It is recommended to fertilize the roots with a concentration of 0.5%-1.0% urea solution above 15 °C.
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