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Expert: It is not good to apply too much fertilizer. Excessive phosphate fertilizer will not only cause waste of fertilizer, but also lead to the lack of trace elements, and it will also cause eutrophication and pollution of surface water when it rushes to the rivers and lakes.
Q: Is calcium superphosphate dampened and has a large nutrient loss?
Expert: After the calcium peroxide is damp, it is only inconvenient to apply and there is no loss of nutrients. Q: Can I apply lime when applying urea? Expert: Applying proper amount of lime in southern acid soil is good for crop growth and improving fertilizer efficiency. However, do not apply lime immediately after urea application, because the urea will volatilize when it becomes ammonium nitrogen in the soil. You can apply lime first, then mix with the soil before applying urea. Or apply lime after one week of applying urea. Q: Why should potassium chloride fertilizer be labeled with potassium oxide? Expert: Potassium chloride fertilizer is a water-soluble salt and does not contain potassium oxide. Potassium fertilizer has various forms and is a unified standard. Both potassium oxide (K2O) is used to indicate and calculate nutrient content. Q: What is the form of nitrogen in the compound fertilizer? Is it related to fertilization? Expert: The form of nitrogen in compound fertilizer depends on what nitrogen fertilizer it uses as raw material, which may be urea state, ammonium nitrogen, nitrate nitrogen or several forms. In the selection of compound fertilizers, it is necessary to pay attention to the use of nitrate nitrogen in paddy fields, but it is most suitable for fertilization in vegetables and early spring. Q: Can I apply potassium chloride to Chinese cabbage? Expert: Chinese cabbage is leafy, you can apply the right amount of potassium chloride. Chinese farmers have a tradition of pouring manure and manure, and people have a lot of chlorine in their urine.
Q: The jujube tree has been planted for two years. Can it be topdressed?
Expert: As the saying goes, "Peach three apricots and four pears for five years, jujube can sell money in the same year." Two years of jujube can of course be fertilized, just to the right amount. As the age of the tree increases, the amount of fertilization and the proportion of nutrients will change. It is suggested that about 0.5 kg of nitrogen-phosphorus compound fertilizer should be applied to each tree at present.
Q: Can fertilization solve the problem of fruit trees in years?
Expert: The sudden cracking of the melons is mainly the result of sudden changes in water and fertilizer supply and temperature. Therefore, proper fertilization and irrigation, keeping the temperature stable, and making the soil nutrients and water in a continuous supply state are the key to overcome the cracking effect. (Source: New Rural Business Daily)
Fertilizer and Fertilization Knowledge Solution
Q: Is there any harm in the excessive application of phosphate fertilizer?
　　 Expert: Rational fertilization helps solve the problem of fruit trees in years. Because the last year's autumn base fertilizer stored enough nutrients in the tree, it can lay the foundation for germination, flowering and fruiting in the coming year; the fertilization in the long fruit period of the previous year can not only meet the nutrient needs of the fruit expansion period, but also help the flower bud differentiation. The next year's flowering results are favorable. Of course, it is necessary to cooperate with various measures such as fruit tree pruning and flower and fruit control to truly overcome the size of the year.
Q: After two days of heavy rain after fertilization, the watermelon began to crack in just one month. What is going on?
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