In the late October to mid-November, when the fruit and vegetable vegetables are planted, diammonium phosphate and urea are applied in a ditch of 15-20 cm deep between every two planting ridges. Apply 30 kg of diammonium phosphate and 15 to 20 kg of urea per mu, while filling the bottom water with the ditch and then ditching the ditch. When planting the seedlings, apply a small amount of diammonium phosphate to each of the two plants, about 40 kg per mu.
Using ammonium sulphate as top dressing and winter topdressing, using urea, due to low soil temperature, urea nutrient decomposition is slow, so the fertilizer effect is slow; although the use of ammonium bicarbonate is fast, but in the closed environment of greenhouse, ammonia volatilization in ammonium bicarbonate is easy to produce. Fat damage. Ammonium sulphate can overcome the shortcomings of the above two kinds of fertilizers. Therefore, in winter, it is better to apply 20~30 kg of ammonium sulphate per acre. The fertilizer should be dissolved in water beforehand, and then the fertilizer should be applied with water. Usually every other time, water is poured once.
It is a bio-organic and inorganic compound fertilizer used as a base fertilizer, with comprehensive nutrients, long-lasting fertility and quick fertilizer effect. It is used as a top dressing, with quick fertilizer effect and remarkable effect. It is an ideal compound fertilizer for vegetable fields. 120 kg per mu is used as the base fertilizer. When the vegetables are planted, they are applied or ditched; 40 kg per mu is used as top dressing, shallow ditch is applied, and the soil is filled after burying.
The production of vegetables in the greenhouse is very close, and the carbon dioxide content in the shed is low, so photosynthesis is inhibited, so carbon dioxide needs to be added. Tests have shown that cucumber carbon dioxide production can increase production by more than 35%. The leafy vegetables are preferably applied with carbon dioxide in the early stage of growth, and the melons and fruits should be applied from the beginning of flowering. Generally, the carbon dioxide topdressing is carried out at 9-11 am on a sunny day. Carbonammonium + 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 carbon dioxide. Appropriate ventilation after 1.5~2 hours of application. If carbon dioxide solid particle gas fertilizer is applied, 40 kg per mu is required, which can be directly applied or buried in the surface, and the effective period can be more than 45 days.
Farmers Daily
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