In recent years, the use of farmyard manure in rice fields is generally less, even if the amount of rice stalks returned to farms is limited, mainly due to chemical fertilizers that do not contribute to long-term fertilizer efficiency. At the same time, the growth period of the late rice is from the high temperature to the low temperature. Fertilizer decomposition Fast root system Fertility is strong. When the earing is strong and requires sufficient nutrients, there is not much residual fertilizer in the soil, and nutrients are often insufficient. 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 eared, the ear is broken to see the ear: If the half of the spike is grainy, the blue stem is also green and the blue color indicates that the foot grain is greenish white at the end, while the other grain is white and the white stem is yellowish-white, indicating lack of fertilizer; when heading Grain and branch with green is enough fat with yellowish green is the lack of fertilizer. The application time and method of strong grain fertilizer is generally used in the rice heading stage with potassium dihydrogen phosphate 150-200g watered 50kg spraying such as soil fertility The lower yellow leaves can be prematurely yellowed, and at the same time, 1 kg of urea can be sprayed per acre to keep the functional leaves from premature aging.
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