What should be paid attention to when applying all kinds of nitrogen fertilizer?
What should be paid attention to when applying all kinds of nitrogen fertilizer? Please introduce the following problems that should be paid attention to when applying all kinds of nitrogen fertilizer: 1. Ammonium nitrogen fertilizer should not be mixed with alkaline fertilizer. Ammonia volatilization will be produced after mixed application, which will reduce the fertilizer effect. 2. Ammonium bicarbonate is not suitable for spreading. The property of ammonium bicarbonate is very unstable, and it is easy to cause a large amount of volatilization loss under the condition of high temperature and humidity after spreading to the surface. 3. Ammonium sulfate is not suitable for long-term application. It is an acid fertilizer. Long-term application on calcareous soil will cause soil consolidation and destroy soil structure. 4. Ammonium sulfate should not be applied in large quantities in paddy field. After ammonium sulfate is applied into the paddy field, it will fall into the anoxic reduction layer and be reduced to H2S by SO42-, which is easy to make rice form black root and rotten root. 5. Ammonium chloride should not be applied to taboo crops. The application of ammonium chloride to potato, sugarcane, tobacco and berry crops will seriously affect the quality of crops. 6. Nitrate nitrogen fertilizer should not be mixed with organic fertilizer, which contains more organic matter. Nitrate nitrogen fertilizer will produce nitrification reaction under the action of denitrifying bacteria, resulting in nitrogen loss and reducing fertilizer effect. 7. Nitrate nitrogen fertilizer is not suitable to be applied in rice field. Under the condition of anoxia, nitrate fertilizer is easy to be decomposed by denitrifying bacteria, and nitrate is separated and lost with water, which reduces the fertilizer efficiency. 8. Urea is not suitable to be used as fertilizer. Urea contains a certain amount of biuret, which affects seed germination. Too high concentration can cause seed poisoning and sprouting. 9. Urea should not be applied shallowly. After urea is applied to the soil, it will be transformed into ammonium nitrogen under the action of soil microorganisms. if the application is too shallow, it is very easy to decompose NH3 and volatilize. 10. The concentration of urea is too high for external root topdressing. Urea is a variety with good effect of topdressing outside the root, but the application concentration should not be too high. Generally, grain and cotton crops can be mastered at 0.8 per cent, fruits and vegetables 0.4 per cent. Click to get more nitrogen, phosphorus, potassium application techniques click to get more chemical fertilizer application techniques
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Can only nitrogen fertilizer be applied to the base fertilizer in autumn and winter?
Can only nitrogen fertilizer be applied to the base fertilizer in autumn and winter? Please introduce that when some farmers are used to sowing crops in autumn and winter, they apply 80 kilograms of ammonium bicarbonate per mu or 60 kilograms of urea per mu. This single application of nitrogen fertilizer will often cause some adverse consequences. First, it reduces the utilization rate of chemical fertilizer. Excessive application of ammonium bicarbonate and urea.
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What kind of fertilizer should be used in the flowering and fruiting period of strawberries?
What kind of fertilizer should be used in the flowering and fruiting period of strawberries? Please introduce strawberry continuous flowering and fruiting, more flowering, large fruiting, long flowering and fruiting period, and more phosphorus and potassium fertilizer consumption. once there is less phosphorus and less potassium during flowering and fruiting, it will reduce cold resistance, less flowers, weak buds and affect flowering and fruit. not only the fruit setting rate is low, the fruit is easy.
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