The growth period of rice is 90-180 days. It can be divided into two stages of vegetative growth and reproductive growth. The reproductive growth stage is a period of time from rice ear differentiation to rice maturity, and can be divided into long panicle stage and fruiting stage. During the fruiting period from heading to grain maturation, the fruiting period is an important time to determine the seed setting rate and grain weight. At this time, we must try our best to maintain rice with the strongest photosynthetic productivity. The purpose is to increase the seed setting rate and increase the grain weight. Root Wang stalk green, many leaves, head and tidy seeds full, specific management measures are: First, moisture management In the heading and flowering stage, shallow water layer should be kept to prevent dry water; after heading, intermittent irrigation should be adopted. That is, shallow water should be poured, and natural water should be drained and then recharged with new water. The former water cannot see the rear water to achieve the coordination of water and soil in the paddy soil. Gas rooting; Yellow middling can be drained to dry, promote premature, easy to harvest. The irrigation is stopped 5-7 days before harvest. Second, discretionary fertilizer Grasp the principle of fertilization by seedlings, grow longer than the normal field, grain fertilizer can not be applied or less; such as the head of the leaf color fade faster after heading, after the panicle can be used 2% urea, 0.2% phosphoric acid Potassium dihydrogen or some growth regulators, combined with pest control for extra-root fertilizer. Third, control pests Focus on the control of rice planthoppers and the prevention of panicle blast and sheath blight.
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