Early application of fertilizer in the greenhouse in the greenhouse, the production of vegetables 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.
Qiao Shi Ding Zhi Fei In late October to mid-November, when planting vegetables and fruits, in each of the two planting ridges, a 15-20 cm deep ditch was applied to diammonium phosphate and urea. Per acre of DAP 30 kg, urea 15 ~ 20 kg, while ditching bottom irrigation water, and then buried in the ditch. When planting seedlings, a small amount of diammonium phosphate is applied between every two seedlings, which is about 40 kg per mu.
Clever use of ammonium sulfate as topdressing fertilizer in winter, use of urea, due to low soil temperature, urea nutrient decomposition is slow, so play a slow effect; use of ammonium bicarbonate, although the fertilizer effect is fast, but in the confined greenhouse greenhouse ammonia ammonia volatilization is easy to produce Fat damage. Ammonium sulfate can overcome the disadvantages of the above two fertilizers. Therefore, it is advisable to apply topdressing fertilizer in the winter with 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.
Using bio-organic and inorganic compound fertilizers as a base fertilizer, the nutrients are comprehensive, the fertility is long-lasting, and the fertilizer effect is fast; using it as a top-dressing fertilizer has a rapid effect and a significant effect, and is an ideal compound fertilizer for vegetable fields. 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.
The clever application of greenhouse gas to produce vegetables is basically in a closed condition. The carbon dioxide content in the shed is low, and photosynthesis is inhibited. Therefore, carbon dioxide must be added. Tests have shown that cucumbers can increase production of carbon dioxide by more than 35%. Leaf vegetables are better to use carbon dioxide in the early growth period, and fruits and vegetables should be applied from the initial flowering stage. Generally, the carbon dioxide topdressing is carried out at 9 to 11 o'clock in the sunny morning, 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 shed reaches 1000 mg/kg. Do not ventilate when applying CO2, 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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