In recent years, late-season paddy fields use less farmyard manure, and even if rice stalks are used to return crops, the quantity is limited, mainly relying on chemical fertilizers to promote development, and the fertilizer effect is not lasting. At the same time, the late rice growth period is from high temperature to low temperature, and the previous fertilizer decomposition is fast. The ability of roots to attract fertilizers is strong. When sufficient nutrients are needed for heading and sapling, there is not much residual fertilizer in the soil, and nutrients are often not enough. If the supply of fertilizer is not available in the later period, there will be phenomena such as low rate of ear formation, short panicles, few grains, many empty grains, and insufficient grain. Therefore, it is necessary to apply strong fertilizer in a timely manner to supplement nutrients. Strong tail fertilizer is divided into strong and strong fertilizer. First, strong panicle fertilizer In early September, late rice generally enters the 3-4 period of young panicle differentiation. At this time, there is one of the following performances, it is necessary to apply strong panicle fertilizer. First, Miao Miao up to "four leaves blue and two yellow leaves", that is, there are three or four pieces of green leaves in the upper part, and there are two pieces of chlorosis or dryness in the leaves. People walking down the field, the loquat leaves do not bind foot, indicating that the leaves are straight and the feet are dry. The second is between the main stem and the tiller. If they are uneven, they indicate weak delivery and lack of nutrients. The application method of strong panicle fertilizer is to keep the shallow water layer in the field, and generally use 6-9 kg of imported ternary compound fertilizer per mu. Second, the strong grain fertilizer The judgment method of the application is mainly based on the color of grains and panicle branches. When the ear is not heading, the ear is broken. For example, if the half of the spikes are blue, and the branches are blue, it means that the foot is fat. If the last few grains are white, the remaining grains are white, and the branches are yellowish-white. Fertilizer; head and grains with green stems are sufficient for heading, yellow-green color is the lack of fertilizer. The application time and method of strong grain fertilizer, usually in the ear of rice, with 150-200 grams of potassium dihydrogen phosphate per acre 50 kg of water spray, such as low soil fertility, yellow leaves prematurely, can be added at the same time per mus of 1 kg sprayed urea, in order to maintain functional leaves not premature aging.
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