The increase of potassium fertilizer application in late rice has become more and more obvious, especially hybrid late rice. In recent years, with late hybrid rice. In recent years, with the large-scale cultivation of hybrid late rice, the potassium-deficient response is more sensitive than conventional rice, and the effect of less potassium on the yield of late rice is even more pronounced. Late rice is vulnerable to low temperatures and pests in the late stage. The application of potash fertilizer can increase disease resistance and resistance. Cold capacity, and can extend the life of the leaves, prevent the occurrence and development of premature aging, but also enhance the vitality of roots, improve the absorption and utilization of fertilizer in late rice, and promote the high yield of late rice. How does late rice use chemical potassium fertilizer rationally? In general, pay attention to the following three points: First, the amount of potash should be appropriate. The application of potash fertilizer is not as good as possible, and the increase in rice yield is 5-12 kilograms per acre, and the economic benefit is also the best. The second is to apply the appropriate time. According to the characteristics of rice young tissue most need potassium, maximum intensity of potassium absorption from tiller to booting stage, and potassium can be reused in the body. If 5 kg of potassium chloride is applied per acre, it is best to apply top dressing at the beginning of tillering. Good; if using 10 kg of potassium chloride per acre late rice, it is best to use two times, the first time before transplanting seedlings Pingtian Shi, 6-7 kg per acre for the second time with 3-4 kg per acre in late rice in the tillering period It can be combined with the first topdressing nitrogen application to meet the needs of late rice uptake peaks. The third is to give priority to potassium in hybrid late rice. Due to the thick stems and deep rooted leaves of hybrid late rice, the amount of potassium needed is also correspondingly large. Where chemical potassium fertilizers are in short supply, the requirements for hybrid late rice should be met first, and the application rate should also be higher than those of japonica rice and other late rice. In the later stage of hybrid late rice, potassium dihydrogen phosphate solution should be applied 1-2 times. For late rice, if potassium is used, potassium chloride should be used in poorly drained soil. Potassium sulphate should not be used to prevent sulfate root from reducing to sulfide poisoning. Ningbo DOKEE Medical Technology Co., Ltd. , https://www.dokeemedical.com