Absorption of nutrients by Rice at different growth stages
The absorption of nutrients in different growth stages of rice varies greatly with different types. The growth period of double cropping rice is short, especially the vegetative growth period in the field is shortened, and the vegetative growth and reproductive growth overlap shortly after transplanting. That is, panicle differentiation began at the same time of tillering in the field, and entered the peak tillering stage in the process of panicle differentiation, so a prominent fertilizer absorption peak was formed at 2-3 weeks after transplanting, and two fertilizer absorption peaks were formed for single-cropping rice at 2-3 weeks and 7-9 weeks after transplanting.
The absorption rate of all kinds of nutrients by rice reached the maximum before heading, and then decreased. Among all kinds of nutrients, the absorption rate of nitrogen, phosphorus and potassium was the fastest and reached the maximum about 20 days before heading, while the absorption of silicon reached the maximum later.
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Water Management in different growth stages of Rice
Rice has strict requirements for water conditions, and water requirements are different in different growth stages. In order to ensure stable and high yield of rice, scientific water management should be carried out according to different growth stages. 1. Irrigation in shallow water frequently at tillering stage. Frequent irrigation in shallow water at tillering stage makes the stem of rice plant transparent, and sunlight can directly illuminate the stem of rice plant, increase water temperature and soil temperature, increase oxygen in soil, promote root development, improve fertilizer absorption capacity, promote early tillering, and improve tiller panicle rate. The depth of irrigation should be 3-5 cm according to weather conditions, and shallow water should be used on cloudy and rainy days. High
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What is the reason why rice does not bear fruit?
It is understood that in the budding and heading stage, rice is extremely sensitive to temperature, the most suitable temperature is 25 to 30 degrees Celsius, more than 30 degrees Celsius will have an adverse effect. In the case of continuous high temperature above 35 degrees at booting stage, the floral organ of rice will be underdeveloped, the pollen will be stunted and the vigor will decline. If there is a continuous high temperature above 35 degrees in the heading and flowering stage, heat damage will occur, which will affect the rupture of pollen and the elongation of pollen tube, resulting in the formation of empty shell grains due to inability to fertilize, resulting in what farmers call flowering and fruiting.
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