Late rice has many advantages such as large spikes and many grains, strong tillering ability, but it needs large amount of fertilizer. Due to high temperature in early growth stage, fertilizer is easily decomposed and utilized, the temperature in the later period is gradually reduced, the fertilizer is decomposed slowly, the soil fertility is weakened, and defertilization is prone to occur. Premature ageing affects the development of ear and grain of late rice. Therefore, grasping the application techniques of several fertilizers in late-middle-season hybrid rice can help to avoid weaknesses and give full play to its potential for increasing production.
1, promote flower fat. Fertilizing at the early stage of early differentiation of young panicles can promote the differentiation of branches and spikelets, increase the number of branches and spikelets per panicle, and in the case of normal normal growth, the number of panicles and grains of hybrid late rice is much, and the number of branches and spikelets is also increased. More, you don't need to chase after applying fertilizer. However, in the case of deficiency of Daejeon base fertilizer, it is necessary to chase after application of appropriate fertilizers. It can be used to promote flowering fertilizer when 3 to 4 kg of urea per mu is used at the beginning of spikelet differentiation (ie, when the penultimate 3rd leaf has just exposed).
2, preserved fertilizer. Before meiosis of pollen mother cells, that is, spikelet differentiation is in the period from the end of the 4th period to the beginning of the 5th period, it can ensure sufficient nutrition during this period, prevent the degradation of the branches and spikelets, and increase the seed setting rate. The principle of its application is: For the poor growth and robust application of seedlings, prosperous and leggy seedlings should not be applied. The appropriate period for the application of the flowering fertilizer is: Generally, the top dressing is applied 2-3 days before the tip of the flag (leaf 1 leaf) and when the flag leaf is exposed. Normal growth of seedlings, apply 5-7 kg of compound fertilizer per acre, or 3 kg of urea per acre, 3-4 kg of potassium chloride, 7-10 kg of superphosphate mixed topdressing. Poor growth of seedlings, can be appropriately increased urea dosage, but should not exceed 5 kg per mu.
3, break fat. The top dressing of the flag leaf leaf pillow immediately after rice ear emergence can prevent premature aging of hybrid late rice and prolong the functional period of leaves, and has a good effect on improving seed setting rate and increasing grain weight. For growth potential and robust seedlings, it is appropriate to apply 2 kg of urea per acre for the breakage fertilizer. It is not appropriate to break the manure for the long seedlings.
4, strong seed fertilizer. Hybrid late rice has a long grouting time. In order to ensure that there is no shortage of fertilizer during the grain filling period and reduce the openability, it is common to apply foliar seed fertilizer once at the beginning of the heading and at the full heading stage, and use 150-200 g monoammonium phosphate per acre. 60 kilograms of water will be sprayed on the sunny day after the dew on the sunny day, or sprayed on the leaves after 4:00 pm. For the younger seedlings with lighter leaf color, less fertilizer and poor growth, 0.5 kg of urea can be mixed and sprayed per acre for half an hour. In case of rain, it should be sprayed once.
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