The principle of fertilization for hybrid rice should be organic fertilizer and phosphating fertilizer as base fertilizer. Potassium fertilizer is mainly used as tiller fertilizer. Nitriding fertilizer is used for multiple applications. Special attention is given to strong and strong seed fertilizers.
(1) Based on organic fertilizer
It has been determined that the total amount of uptake of hybrid rice has 50% to 60% of nitrogen and 70% of phosphorus and potassium come from the soil. If there is insufficient fertilization, it will consume too much soil potential nutrients and reduce soil fertility. Adding organic fertilizer is maintenance and An important way to increase land productivity. Therefore, the production of hybrid rice should emphasize the accumulation of soil-based miscellaneous fertilizers, the development of afforestation with multiple planting fertilizers, and a variety of green manures, and promotion of amaranth harvesting and rice straw returning, so that the amount of organic fertilizers accounts for 40% of the total fertilization.
(2) Appropriate amount of early application of fertilizer
Since the root activity of hybrid rice is strong, the new roots are inserted faster. Generally 5 days after early rice insertion, 3 days after late rice insertion, urea can be used to promote tillering, and sub tillage fertilizer should be applied in divided doses for the first time. Mushi urea 6-7.5 kg; every 7 days or so, according to the condition of the seedlings, the poor growth of the plots, make-up the second application of fertilizer, less than 4 kilograms of urea; the application of organic fertilizer less and potassium fertilizer plots , Chase 5-7.5 kg of potassium per mu.
(3) See seedlings for application of panicle fertilizer
Panicle fertilizer can be divided into flower-promoting fertilizer and flower-preserving fertilizer due to different application periods and effects. For those with proper early fertilization and seedling growth balance, the general emphasis should be on increasing the number of preserved flowers, and only applying the fertilizer and applying amount should not be too much. Generally, about 2.5 kg of urea is used per acre. If the pre-fertilization is insufficient, the number of seedlings in the group is too small, and the individuals have poor growth potential, then both the stimulating fertilizer and the preserved fertilizer can be applied, and 5 kg of urea can be applied per acre. The demand for potash fertilizer for hybrid rice is large, and combined with topdressing of nitrogen fertilizer after rejuvenation in the field, the construction of about 2.5 kg of potash fertilizer per acre will increase production.
(4) See the seedling application of grain fertilizer and foliar dressing. Before the seedlings, the leaf color of the seedlings is too light, 2 to 2.5 kg of urea is applied per acre, and the field of premature yellowing after heading is urea 2.5--3 per acre. Kilograms of normal hybrid rice should only be sprayed with 500-750 kilograms of urea and 50 kilograms of water.
Because the absorption of P and K is relatively high in late hybrid rice, late-stage foliar fertilizer has a good yield-increasing effect. Potted plants with poor growth were sprayed with potassium dihydrogen phosphate 150-200 kg and water 50 kg for 4-6 days before heading or 2-3 days for full-backing log, which enhanced the ability of the plants to resist high or low temperatures.
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