The principle of rice fertilization should be organic fertilizer and phosphate fertilizer as base fertilizer. Potassium fertilizer is mainly used as tiller fertilizer. Nitrogen fertilizer is applied several times, especially pay attention to strong seedlings and strong seed fertilizer. At the same time, the large ear and large grain are attacked at the same time.
(1) The base fertilizer is based on organic fertilizer. The total amount of rice absorbed by the rice is 50%-60% of nitrogen and 70% of phosphorus and potassium are from the soil. If the fertilizer is insufficient, the potential nutrients in the soil will be excessively consumed and the soil fertility will be reduced. Adding organic fertilizer is an important way to maintain and improve soil fertility. Therefore, rice production should emphasize the accumulation of soil and fertilizer, develop more fertilizers and a variety of green manure in the aquaculture industry, promote the harvesting of stalks and returning rice to the fields, so that the application of organic fertilizers accounts for 40% of the total fertilizer application.
(2) Appropriate amount of early application of glutinous rice Because rice has strong root activity, the new roots occur faster after insertion. Generally, early rice is inserted 5 days after insertion, and late rice is added for 3 days after insertion, and urea can be applied to promote tillering. In divided application, the first application of urea per acre is 6-7.5 kg; after 7 days, according to the seedling situation, for the poor growth of the field, the second application of fertilizer is used within 4 kg of urea; Fields with less and less potassium fertilizer are chasing 5-7.5 kg of potash per acre.
(3) Seeing seedling application, panicle fertilizer and panicle fertilizer can be divided into flower-promoting fertilizer and flower-preserving fertilizer due to different application period and effect. Generally, the appropriate fertilization in the early stage and the balance of the growth of the seedlings should be based on the preservation of the flower and only the application of the flower fertilizer and the application amount should not be too much. Generally, about 2.5 kg of urea per mu is applied. If the early stage of fertilization is insufficient, the number of seedlings is small, and the individual's growth potential is poor, then both the flower-promoting and the flower-preserving fertilizer can be applied, and 5 kg of urea can be applied per acre. Rice has a large demand for potassium fertilizer. After rehydration in the sun, it is combined with topdressing nitrogen fertilizer, and about 2.5 kilograms of potash is applied per acre to increase the yield.
(4) Look at the seedling application of granular fertilizer and foliar topdressing before the beginning of the ear, the leaf color of the seedlings is too light, apply 2-2.5 kg of urea per acre, and prematurely fall yellow field after the heading, apply urea 2.5--3 per mu. For kilograms of normal hybrid rice, it is only suitable to use 500--750 kg of urea to 50 kg of water for spraying.
Because of the higher absorption of phosphorus and potassium in the late stage of rice, the late application of foliar fertilizer has a good yield increasing effect. Spraying 50 kg of potassium dihydrogen phosphate to 50 kg of water for 2-3 days before the first spike or the 2-3 days of the beginning of the spike, the spray of the poor growth of the seedlings has the ability to enhance the plant's resistance to high or low temperatures.
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