1. Urea should not be watered immediately after use.Urea soluble fertilizer, strong mobility, easy to cause loss. Urea should not be watered immediately after dry land is applied, nor should it be applied before heavy rain.

2, ammonium bicarbonate should not be applied to the soil surface.Ammonium carbon volatile, easy to cause burning seedlings. Therefore, ammonium bicarbonate should not be applied on the surface. It is better to open holes for deep application and cover the soil after application.

3. Ammonium bicarbonate should not be applied in greenhouses and greenhouses.Ammonium bicarbonate is known as "gas fertilizer" and is easily decomposed into ammonia gas when applied in greenhouses and greenhouses.

4, ammonium nitrogen fertilizer should not be mixed with alkaline fertilizer.Ammonium carbonate, ammonium sulfate, ammonium nitrate, ammonium phosphate and other ammonium nitrogen fertilizers encounter alkaline substances, will cause the loss of nitrogen. Do not volatilize with alkaline fertilizers such as plant ash and kiln ash potash. And lime nitrogen and other mixed application.

5. Nitrate nitrogen fertilizer shall not be applied in paddy field.Nitrate ions dissociated from nitrate nitrogen fertilizers such as ammonium carbonate are easily leached by water in paddy fields to deep soil layers to produce denitrification, resulting in nitrogen loss.

6, ammonium sulfate should not be used for a long time.Ammonium sulfate is a physiological acid fertilizer, which destroys the physical structure of the soil. Long-term application in alkaline soil will also cause sulfate ions remaining in the soil to react with calcium, making the soil harden and stiff.

7, phosphate fertilizer should not be scattered application.Phosphorus mobility is small, easy to be absorbed by the soil fixed, reduce fertilizer efficiency. When applying phosphate fertilizer, the contact area between phosphate fertilizer and soil should be reduced. It is best to use ditch application or hole application, and concentrate on the crops near the roots.

8. Potassium fertilizer should not be applied in the later period of crops.Potassium has the characteristic that it can be transferred from the base stem and leaf of the crop to the top tender part for reuse, so potassium deficiency is later than nitrogen and phosphorus. Therefore, potassium fertilizer should be applied in advance in the early stage of crop production, or once as a base fertilizer.

9, chlorine fertilizer to avoid long-term separate application, and avoid the use of chlorine in crops.Long-term application of potassium chloride alone will increase the accumulation of chloride ions in the soil, resulting in the destruction of soil nutrient structure and soil acidification. In sugar cane, sugar beet, watermelon, tobacco and other crops, will reduce the quality and quality.

10, nitrogen compound fertilizer should not be used in large quantities for leguminous crops.There are nitrogen-fixing rhizobia near the roots of soybean, peanut, mung bean, broad bean, pea, alfalfa and other crops. If a large amount of nitrogen-containing compound fertilizer is applied, it will not only cause waste of fertilizer, but also inhibit the activity of rhizobia and reduce its nitrogen fixation performance.

2. how to use farm manure correctly

(1) Compost:The fertilizer overstocked with weeds and garbage as raw materials can be used according to local conditions, and it is best to combine spring and autumn ploughing as base fertilizer.

(2) Green manure:It is best to do legume crop base fertilizer or top dressing, the use of rhizobia nitrogen fixation to improve soil fertility.

(3) Sheep dung:It is a thermal fertilizer, suitable for mixed application with pig manure, suitable for cool soil and overcast sloping land.

(4) Pig manure:Organic matter and nitrogen, phosphorus, potassium content is more, decomposed pig manure can be applied to a variety of soil, especially suitable for well-drained hot soil.

(5) Horse manure:Organic matter, nitrogen, cellulose content is higher, containing high temperature fiber decomposition bacteria, in the accumulation of fast fermentation, high heat, suitable for wet sticky heavy soil and shade slope and soil with serious consolidation.

(6) Cow dung:It is a typical cold fertilizer. Drying cow dung in the sun and mixing 3-5% wood ash or phosphate rock powder or horse dung for accumulation can accelerate the decomposition of cow dung and improve fertilizer efficiency. It is best to use it in combination with hot fertilizer or apply it to sandy soil and sunny slope.

(7) human feces and urine:After fermentation, it can be used directly, or mixed with soil to make large manure for top dressing.

(8) Poultry fertilizer:High nutrient content, can be used as seed fertilizer and top dressing, most suitable for vegetables.