1. Apply early base fertilizer. In winter and spring, greenhouse vegetable production should be advanced to the ground in late September. Spread 5000 kg of cooked organic fertilizer per acre, then plunge 30 cm deep and mix manure and soil. 2. Qiao Shi set fertilizer. From late October to mid-November, when planting fruit and vegetables, a 15-20 cm deep ditch is applied to diammonium phosphate and urea in every two colonization ridges. Apply 30 kg of ammonium phosphate per acre, and 15-20 kg of urea. At the same time, fill the bottom with water and then bury the ditch. When planting seedlings, a small amount of diammonium phosphate is applied between every two seedlings, which is about 40 kg per mu. 3. Cleverly using ammonium sulfate as top dressing. Fertilizer in winter, ammonium sulfate is better than urea and ammonium bicarbonate, and it is appropriate to apply 20-30 kg of ammonium sulfate per acre. The fertilizer should be dissolved in water beforehand, and the fertilizer solution should be flushed with water. Usually every other time the water, pouring a fertilizer. 4. Clever use of biological organic-inorganic compound fertilizers. Use it as a base fertilizer, nutrient comprehensive, long-lasting fertility, play a rapid fertilizer effect; use it as a top dressing, fertilizer effect is fast, a significant effect, is an ideal vegetable compound fertilizer. Use 120 kg per acre as the base fertilizer, spread or apply when the vegetables are planted; use 40 kg per acre as top dressing, apply a shallow ditch, and then fill with water after burying the soil. 5. Skillfully applying gas fertilizer. Generally, the carbon dioxide fertilizer is applied at 9 to 11 o'clock in the morning on sunny days, and ammonium bicarbonate + sulfuric acid, or baking soda + sulfuric acid can be used to produce carbon dioxide after mixing, so that the carbon dioxide content in the greenhouse can reach 1,000 mg/kg. Do not ventilate the carbon dioxide when it is applied, and ventilate it after 1.5 to 2 hours of application. If the application of solid carbon dioxide gas fertilizer, per acre need to apply 40 kilograms, can be directly applied or buried on the surface, valid for up to 45 days.
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