After transplanting, hybrid early rice often encounters low-temperature and rainy weather, and the early growth is often slow, the development period is delayed, and if the management is not strengthened in the later period, it will inevitably affect the yield and quality of hybrid early rice. Early management of hybrid early rice should focus on five defenses.
Early prevention of dehydration of hybrid rice roots developed, lush stems and leaves, water absorption, absorption capacity than conventional rice, especially after the booting period to ensure its fertilizer and water supply. After the heading of hybrid early rice, the roots become increasingly senescent: To ensure the supply of fertilizer and water, increase the air permeability of the soil, so that the water and gas alternate, cultivating roots with qi, rooting the leaves, and seedlings with leaves. Hybrid rice has a large ear and large grain heterosis, and there is a clear secondary grouting process. During the period from grouting to yellow ripening, we should adhere to interstitial irrigation, and can not stop water early in the later period. If the water is cut off early in the late period, it will often accelerate the premature decline of the hybrid early rice, which will have a significant impact on the seed setting rate and the 1000-grain weight. Therefore, the water management during the grain filling stage should be mainly wet, and the wax ripening period should be mainly dry, and the water should be cut off from 5 days to 7 days before harvest.
Two late-maturing late-season cultivars were relatively late, with fewer tillers per plant, and early hybrids with late-season hybrid rice. They were often too late or partial nitrogen fertilizers, and they were prone to late-maturing glutinous and late lodging. For example, at the later stage, rice plants were found to be covered with vertical spurs, and there may be glutinous and late-maturing fields. In addition to timely drying of water, 250 grams of rice vinegar and 1 kilogram of superphosphate can be used per 667 square meters of paddy field. 24 hours after the leaching, the filtrate is added) or potassium dihydrogen phosphate 100g to 150g, and 50kg of water is added to spray at the booting stage, heading stage, and grain filling stage to promote the flag leaf of the rice plant to be straight, increase the photosynthetic efficiency, and increase the fruiting capacity. Rate and thousand grain weight.
The three hybrids with early senescence had a small amount of organic fertilizer in the early rice field, and had insufficient early fertilization, and they did not make timely fertilizer in the later period. Some of them were in irrigation state for a long time because they did not do a good work in the field, and the soil was severely deprived of oxygen and development of the rice root was blocked. Lead to premature aging in early hybrid rice. For these types of plots, dry and wet irrigation methods should be implemented to promptly dry the fields during the effective termination of tillering, to promote root control, to promote vegetative growth to reproductive growth and transformation, and to take root and strong stalks. In addition, good grain fertilizer should be applied. In the grain-filling period, potassium dihydrogen phosphate 100g-150g and water 50kg per 667m2 paddy field can be used. After 4pm, two-thirds of sprays are sprayed. Each time interval is two or three days, which can extend the life of functional leaves, prevent premature aging and increase the weight of one thousand grains.
Four diseases and insect pests damage hybrid rice due to dark green leaves, luxuriant growth, late susceptible to rice planthopper, vertical leafhopper, sheath blight, rice blast disease and bacterial blight and other diseases and insect pests. Therefore, in the late stage of hybrid early rice growth, field observation should be strengthened to prevent the occurrence of pests and diseases to reduce production, especially after heading to prevent rice planthopper and sheath blight hazards. In recent years, some hybrid early rice crops have suffered from rice-flying planthopper damage and caused deaths and lodgings, resulting in severe reductions in production. The hybrid early rice from the booting stage to the yellow ripe stage is most vulnerable to the third generation rice planthoppers. When there are 1000 to 1500 larvae of 2 to 3 instars per 100 seedlings, the pesticides should be controlled in time, and the pesticides can be selected and used. Jin special and so on.
The growth period of the five hybrid early-season hybrid rice varieties is relatively long, especially the "double miscellaneous"-matched paddy fields, the seasonal contradictions are prominent, and some harvesting and harvesting phenomena occur due to harvesting and grabbing, which seriously affects the yield of hybrid early rice and quality. In order to ensure the early harvest of late rice and late rice, comprehensive measures should be taken instead of cutting green. Hybrid early rice should be harvested when the grains are golden yellow and fully mature. Doing a hill and cutting a hill will not only allow timely harvesting of early rice, but will not affect late rice planting.
Author: Minjiang Rural Office
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