At present, the key period of field management of hybrid mid-season rice is to capture the high yield of hybrid mid-season rice. The following technical points should be carefully grasped in fertilization.

The application of good-yield mid-season rice is generally about 15 days after transplanting, and the number of basic seedlings per mu is about 200,000. This is the performance of early-onset, such seedling potential, single leaves growing more, material accumulation is more abundant, conducive to the thick stems, the formation of large ear, can maximize the advantages of hybrid rice ear large and large. Therefore, we must apply good manure, and manure is the basis for early-onset disease. It is both early and clever. It means applying 7-8 kilograms of urea per acre for 4-5 days after transplanting, so that its fertilizer effect can be utilized and the flood season can be reached. Consistent with this, it promotes multiple occurrences and reaches a “boom”; clever means that due to fertilization in fields, it is possible to use more fields in thin fields and less application of fertilizers. To prevent excessive nitrogen. Wang Miao difficult to control, avoid diazo light phosphorus, potassium and affect early hair.

Seeing Miao Shi ear fertilizer application of panicle fertilizer not only increases the number of panicles, but also strives for large panicles and achieves both panicle and grain weight. In the stage of young panicle differentiation, sufficient supply of nutrients can be obtained, and some late tillers can be made into panicles. For fields with fewer stems per acre, it is the last resort to fight for the ear, and the application of panicle fertilizer can increase branches and branches. The number of spikelets provides favorable conditions for the formation of large spikes. In particular, it can also prevent the degradation of spikelets, increase the color of leaves, and enhance photosynthesis. It is also extremely beneficial to increase the number of grains and must be applied according to seedlings. Weak seedlings are early and heavy. In the 4-5 days after rejuvenation in the dry field, the leaf color cannot be regreened. The lack of sufficient groups indicates a lack of nitrogen. “Hunger” is imminent, and it is necessary to reapply nitrogenous fertilizer early on, before the spike differentiation. Approximately 5-6 kilograms of urea per acre is applied every day, reaching the rush for flowers. And in the 12-15 days before heading, urea 3-4 kg per acre, play a role in increasing grain. Strong and young seedlings are too late. After rejuvenating in the field, the leaf color is green and the leaves are slightly covered, which is regarded as a general or slightly better field. This type of seedlings should be applied late and sparsely applied, so as to avoid the risk of lodging on the internodes of the stem base, and it should be 4-5 cycles of young panicle differentiation, applying 3-4 kg of urea per mu, in order to facilitate flower growth. . Wang Miao should be applied potassium, rice seedlings dark green, strong growth, the stamina is very sufficient field, marking the excess of nitrogen nutrition, such as topdressing nitrogen fertilizer, will cause the group to deteriorate, and more trouble. Therefore, it is not appropriate to apply potassium to nitrogen. It should be 2-3 stages in spike differentiation. Apply 7 kg of potassium chloride per mu or 100 kg of plant ash to coordinate nutrition and increase resistance to high yield.

After supplementing grain-fertilizer mid-season rice, the functional leaves gradually yellowed after heading. If the fertilizer was deferred, the leaves would die prematurely and the ability of the rice plant to photosynthesis would be weakened. Therefore, increasing fertilizer sources, prolonging leaf lifespan, and increasing photosynthetic capacity of leaves are one of the effective measures to promote graininess and plumpness. The application of granule fertilizer is generally based on foliar spraying of the foliar spray, spraying 2-3 times during the breakage period to the grain filling stage, and using 100g of potassium dihydrogen phosphate and 0.5-1 kg of urea per acre, with 50 After dissolving kilograms of water, add 15-20 ml of GW-802 to mix and spray on the stems and leaves of rice plants. For the deficiency of the base fertilizer, the denitrification of the leaves is earlier than that of the yellow ones. Urea 2.5-4 should be taken before the heading. Kg, to promote further differentiation of flower buds and prevent the degradation of spikelets, exerts the big spike advantage of hybrid rice.

When the boron-fed hybrid rice was in flowering and solid stage, boron supply was sufficient, which could increase the seed setting rate and increase grain weight. According to the experiment, the application rate of boron fertilizer in the middle stage of hybrid mid-season rice can increase the seed setting rate by 4.3%, and increase the grain weight by 0.5-1 g. Therefore, in the absence of boron or rapeseed paddy fields, they should be sprayed once at the heading stage and at the full heading stage. They can be used in combination with sprayed granular fertilizers, each with 100 grams of borax or 100 grams of photosynthetic fertilizer. , add 50 kg of water diluted to spray.

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