Potassium fertilizer technical problem set answer
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A: Rice potassium fertilizer can be applied as a base fertilizer once, or before and during jointing. However, if it is added after the heading, it will be too late, which will affect the absorption, because at that time the stem and leaf nutrients began to transfer to the grain, and the root absorption capacity decreased. The loss can be reduced by spraying a potassium dihydrogen phosphate solution.
Ms. Zheng from Xuzhou, Jiangsu Province asked: The local rice fertilizer has been applied a lot. In the early stage, the seedlings were prosperous, but the yield was not high. The yield per mu was up to 500 kg. Is this related to the application of potassium fertilizer?
A: The yield is not related to potash, but potash must also be combined with nitrogen and phosphorus. First, the local farmers' nitrogen application rate is high, and the proportion of nitrogen fertilizer in the early stage is relatively large. If the nitrogen of the base fertilizer and the tiller fertilizer account for more than 80% of the total nitrogen application rate, it is easy to cause the prolonged period, the later de-fertilization, the rate of ear formation is reduced, and the grain is not full. Second, the fertilizer distribution ratio is unreasonable, and the diazo fertilizer is light phosphorus and potassium. On the basis of appropriate amount of nitrogen and phosphorus fertilizer, 5 to 10 kilograms of potassium chloride should be applied per mu, and the base fertilizer, topdressing fertilizer or semi-base fertilizer should be applied once, which can resist disease resistance and increase the rate of ear formation.
Mr. Xiao from Jiaozuo, Henan Province asked: If there is no fertilization for summer corn, what is the best time for potash? Can the light spray surface fertilizer not work?
A: It is recommended to apply high-nitrogen potassium compound fertilizer or nitrogen, phosphorus and potassium fertilizer as soon as possible in the 4 leaf stage. The key is as early as possible, because wheat bran nitrogen fertilizer has no aftereffects, early application of nitrogen is conducive to seedling, and phosphorus and potassium fertilizer is difficult to exert fertilizer effect. As for the late application of foliar fertilizer, of course, it has a role, but the nutrients provided are limited and cannot meet the high-yield needs.
Ms. Donggang of Liaoning Province asked: In the greenhouse, the seedlings are raised, and the seedlings are yellow and thin and weak. Will the potassium fertilizer be used?
A: Potassium fertilizer is good for strong seedlings, of course. However, if the lack of light in time to expose the shed lacks carbon, and the excessive nitrogen fertilizer leads to the imbalance of carbon and nitrogen metabolism, it is easy to cause seedling yellow seedlings to be weak. Therefore, the application of potassium fertilizer must be combined with ventilation and light control and appropriate control of nitrogen fertilizer application.
Ms. Xia of Wuhan, Hubei Province asked: Is it good to use compound fertilizer in the greenhouse with tomato topdressing, nitrogen and potassium fertilizer? Do you use general-purpose compound fertilizer (15-15-15)?
A: As long as the base fertilizer is used reasonably, there is little difference between the two methods, but the compound fertilizer should use high-nitrogen potassium-based sulfur-based compound fertilizer. Generally, the general type is not used because it has a high phosphorus content, which is not only poor in water solubility, but also prone to excessive phosphate fertilizer.
Mr. Li from Datong, Shanxi Province asked: When the grape fruit is inflated, it must be applied with potassium sulfate or sulfur-based compound fertilizer. Why?
A: It is conducive to the accumulation of sugar in the fruit and promote the coloration of the grapes and improve the quality of the fruit.
(Senior Consultant of Sinofert, Professor of China Agricultural University Wang Xingren)
Farmers Daily