Do not mix urea with carbon ammonia
Since urea is applied to the soil, it must be converted into ammonia before it can be absorbed by the crop. The conversion rate is much slower under alkaline conditions than under acidic conditions. After the carbon ammonia was applied to the soil, the reaction was alkaline and the pH was 8.2-8.4. Mixed use of carbon and ammonia in farmland can greatly reduce the rate of conversion of urea to ammonia, which can easily lead to loss of urea and loss of volatiles. Therefore, urea and carbon ammonia should not be mixed or applied at the same time.
Do not make urea fertilizer
In the production process, urea often produces a small amount of biuret. Biuret levels above 2% can cause toxicity to seeds and seedlings. Urea enters into seeds and seedlings and denatures the protein, which affects seed germination and seedling growth.
Do not use unfamiliar farmyard fertilizers
The use of farmyard manure in greenhouses must be fully decomposed, because there is no decomposing farmhouse manure that contains pathogens and eggs. After application, it is easy to spread the disease. In addition, ammonia burned vegetable seedlings will be produced if the farmhouse fertilizer is put into a greenhouse and then cooked.
Do not apply potassium fertilizer alone
Potassium sulfate and potassium chloride are weakly acidic, and potassium ions are easily adsorbed and fixed by the cations of soil colloids when applied to the soil. Crops are difficult to use. Therefore, the application of potash fertilizer should be combined with nitrogen fertilizer and phosphate fertilizer, especially in the mountainous, barren and newly reclaimed land and other phosphorus-deficient land, and should be mixed with the use of phosphate fertilizer in order to give full play to the role of potash fertilizer and phosphate fertilizer.
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