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According to previous years' experience, combined application of leaf-surface fertilizers for preventing and controlling pests at the ear stage of rice can delay the senescence of functional leaves and extend the lifespan of functional leaves for two to three days. Second, they can increase chlorophyll content and improve the photosynthetic efficiency of leaves; The product runs to the grain and promotes grain filling. It can be seen that mixed spraying of medicinal fertilizers at the ear stage not only prevents premature aging, but also is an effective measure to increase production and increase income. In the middle of rice growth this year, continuous high temperature and drought caused the consumption of fertilizers. At present, the color of some plots is lighter or yellowish, and there is a possibility of premature aging in the later period. It must be paid enough attention to fully implement mixed fertilizer spraying.
While doing a good job of spraying mixed fertilizers, it is also necessary to strengthen water slurry management and prevent meteorological disasters. First, in the stage of meiosis and heading and flowering of rice, water-irrigation must be adopted to prevent dehydration and drought. The second is to use wet irrigation (to keep the soil moist) during the grain-filling period, and watering once every 5 to 7 days under normal conditions (2 to 3 days for surface water and 2 to 3 days for surface water-free channels). , water in the ditch 1 to 2 days), until about 1 week before harvest, cut off water, in order to help keep the roots and leaves, live to old. The third is the prevention of meteorological disasters, which is mainly caused by the typhoon-induced lodging (to keep the field board from failing to soften in the later period), and the blight caused by cold wind exposure. In the late growth period of rice, if it is exposed to cold and dew (average temperature is lower than 20°C and minimum temperature is lower than 17°C), the vitality of the root system will decline, physiological water loss may occur, and the plant will become blue and dry. Therefore, it is necessary to insulate water before cold dew wind comes.
Rice heading to maturity is an important period for yield formation. 70% to 80% of the grain yield comes from the photosynthetic product after heading. Only by increasing the photosynthetic product after heading to maximize the yield, it is necessary to protect the leaves. The "two guarantees and two increases" of the protection of spikes, granules, and weight gain are the key points of rice field plowing in the later period. The so-called leaf protection and panicle protection is to prevent and control the "three diseases and four bugs" (panicle blast, rice smut, sheath blight, rice leaf roller, big larvae, stem borer, rice planthopper). White leaves and white spikes to prevent "breakthrough." The so-called granule increase, weight gain, is to promote grain filling sturdiness, increase the seed-setting rate, increase the grain weight, which requires late prevention of premature aging, prevent weather disasters.