How to apply potash to underground fruiting crops?

How to apply potassium fertilizer to underground bearing crops? Why is it applied like this? Underground fruiting crops such as potato, peanut, taro, sweet potato, yam, Jerusalem artichoke, carrot, etc., all have the characteristics of potassium-loving, and the demand for potassium is relatively large. Therefore, more attention should be paid to applying potassium fertilizer to achieve high yield in cultivation. To produce 1000 kg potato tubers, 5 kg pure nitrogen, 2 kg phosphorus pentoxide and 10.6 kg potassium chloride are needed. The absorption ratio of nitrogen, phosphorus and potassium is 1: 0.4: 2.1. The plot of 2500 kg fresh sweet potato per mu, for each 1000 kg sweet potato tuber, needs to absorb 3.5 kg pure nitrogen, 1.8 kg phosphorus pentoxide, 5.5 kg potassium oxide from the soil, and the absorption ratio of nitrogen, phosphorus and potassium is 1: 0.5: 1.6. When the yield of taro per mu was 2000 kg, the average yield of taro was 1000 kg. The amount of pure nitrogen and phosphorus pentoxide required increased slightly, but the amount of potassium oxide required increased obviously. Thus, potato and other underground crops, nitrogen, phosphorus and potassium requirements for the largest potassium. After potassium fertilizer is applied to these crops, firstly, it can increase the swelling pressure of crop cells, make cells elastic, regulate the opening or closing of leaf cells, and help crops absorb more carbon dioxide to produce carbohydrates and form starch and sugar. Second, it can promote root development, absorb more water, alleviate water evaporation, and correspondingly improve crop drought resistance. Thirdly, potassium mainly exists in stems and leaves, which can promote the development of cellulose in stems, improve the supporting ability of stems, enhance the ability of lodging resistance and disease and insect resistance of crops, facilitate the transportation of organic nutrients (starch) in crops to storage organs (underground rhizomes and fruits), accelerate the expansion of roots and pods, thus improving yield, improving quality and increasing planting efficiency. K fertilizer is applied to underground fruiting crops. In terms of fertilization methods, two methods are generally used: base fertilizer and top fertilizer. N, P and K fertilizer allocation: 50% N fertilizer, all P fertilizer and most K fertilizer are used in base fertilizer. The fertilizer varieties of base fertilizer can be selected as general compound fertilizer with concentration, or simple fertilizer can be used. Urea, ammonium nitrate and potassium sulfate can be selected for 50% nitrogen and a small part of potassium used in topdressing. When applying, we should seize the period when potassium is most needed, one is seedling stage. 3-5 kg potassium chloride or potassium sulfate or 25-30 kg plant ash (containing 7.5% available potassium) can be applied per mu as base fertilizer, which is evenly spread during soil preparation and mixed with soil and fertilizer to facilitate timely absorption and utilization by crops. Potash fertilizer can also be applied as seedling fertilizer, 2-3 kg potash fertilizer per mu is applied in strips or holes, the depth is required to be about 10-15 cm, after fertilization, irrigation and soil covering. The other is in tuber formation stage. The same amount of potassium fertilizer can be used per mu, and crack fertilizer and pod fertilizer can be applied after the potato is expanded or the pod is attached to the needle, so that the organic nutrients of the stem and leaf can be effectively accelerated to be poured into the potato to obtain high quality and high yield. Secondly, in the late growth stage of underground bearing crops, 1% potassium sulfate or 0.3% potassium dihydrogen phosphate or 5% plant ash water (soaked for 24 hours and then taken from the clarified solution or filtered solution) can be sprayed 1-2 times outside the roots (interval time is 7-10 days), which can reduce leaf temperature, help drought resistance and eliminate diseases and pests (combined with pest control). The effect is very significant. Pay attention to fertilization time, one-time topdressing, not too early. Generally, the potato pieces are grasped at the expansion stage and then carried out. Premature topdressing, especially after excessive nitrogen fertilizer, will cause the problem of overground part flourishing and underground part bearing small tubers. Potassium chloride and potassium sulfate are physiological acid fertilizers. Long-term application should prevent soil acidification. They can be applied together with appropriate lime. Potassium chloride should not be used in salinized soil, nor can it be used for chlorine-resistant crops. Click for more nitrogen, phosphorus and potassium application technologies Click for more fertilizer application technologies