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When chasing ammonium sulfate in winter, if urea is used, the nutrient decomposition of urea is slow due to low soil temperature, so the fertilizer effect is slow. Although the use of ammonium bicarbonate is fast, the ammonia volatilization in ammonium bicarbonate is easy to produce in the closed environment of greenhouse. Fat damage. Ammonium sulphate can overcome the shortcomings of the above two kinds of chemical fertilizers. Therefore, in winter, it is advisable 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 kind of compound fertilizer which is ideal for vegetable fields. It uses bio-inorganic compound fertilizer as its base fertilizer, which has comprehensive nutrient, long-lasting fertility and quick effect. It is used as top dressing, with quick fertilizer effect and remarkable effect. 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.
Applying gas and fertilizer to produce vegetables in greenhouses requires the addition of carbon dioxide. 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 plus 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 to 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.
Fruit and vegetable vegetables
When planting fertilized fruits and vegetables, we will open a 15-20 cm deep ditch between each two planting ridges, applying 30 kg of diammonium per acre and 15-20 kg of urea, while pouring water into the ditch. Buried trench. When planting the seedlings, apply a small amount of diammonium per two plants, about 40 kg per mu.
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