Rice flooding remedy
If the rice is flooded, if it exceeds 48 hours, the whole plant will die. If some plants are buried, soil nutrients, especially nitrogen, will be washed away and lost, and it is easy to infect pests and diseases. Remedial measures should be taken in time. Generally, the flooding resistance is stronger at the seedling stage and the weakest at the booting stage. Therefore, it is necessary to classify and guide according to the growth schedule of rice and the length of flooding. Post-flooding characteristics In the case of flooding, the poor ventilation, photosynthesis, and respiratory consumption are greatly affected, and physiological activities are greatly affected or even died. The flood-tolerance ability of rice seedlings is relatively strong. The flooding is basically unaffected within 4 days, and it will be inundated for 6-8 days. After the water is discharged, the leaves will dry and die, but most of the seedlings will not grow. After effluent, the seedlings have more black roots, shorter seedlings, less tillers, narrow bases and weak disease resistance. When the rice is flooded from tillering to jointing, the fertility process is almost stopped. After the water is discharged, the plant height becomes shorter; the high tiller is increased in birth, and the proportion of the ear is increased; the heading period is elongated, and the growth period is delayed by 2 to 3 days. The loss of production within 4 days of submersion was small, and the loss over 4 days was significantly increased, generally reducing production by 2 to 30% until the harvest was over. The drought tolerance at the booting stage is the weakest. If the tip of the leaf is submerged for more than 2 days, the differentiation of the young panicle will be seriously affected, and the development of the floret will be blocked. The degree of damage varies with the flooding time and the depth of the flooding, and is affected by the flooded part. It is flooded for more than 4 days, and the topless is 41.9% lower than the uncovered one; the top is flooded for more than 6 days, and the yield is almost unrecognized. After the flooding period, the soil is poorly ventilated, affecting root growth, endosperm dysplasia, increased sputum rate, weight loss and yield reduction. Inundation is generally reduced by 2 to 30% within 5 days, and more than 7 days will seriously affect the seed setting rate and 1000-grain weight, which generally results in a reduction of 5 to 60%. Remedy Drain and rescue as soon as possible. Immediately thereafter, organize manpower, concentrate all drainage equipment, and carry out drainage rescue. Waiting for the high field first, and trying to get the tip of the seed out of the water early, can reduce the number of flooded days and reduce losses. However, when draining, it should be noted that during high temperature and high temperature, the water cannot be drained at one time, and the appropriate water layer must be retained to gradually restore the rice seedlings. Such as one-time draining, because the paddy field is immersed in water for a long time, the viability is weak, the stems and leaves are soft, and it is easy to wither in the sun on a sunny day, but it will aggravate the loss; but in the rainy days, the water can be drained once, which is conducive to the growth of the seedlings. After the rice seedlings are flooded, if the leaves are few, the plant growth is still strong, and there are more floating mud in the field. It can also be drained and lightly placed on the field to prevent the roots from falling. Snoring floats. When the seedlings are retreating, they must remove the floating objects with the water, which can reduce the crushing of the rice seedlings and the decay of the seedlings. At the same time, when the water is just exposed to the tip of the seedling, it is necessary to wash the seedlings, and the bamboo raft can be oscillated back and forth to wash away the sediment of the stems and leaves, and the effect on the recovery of the rice seedlings is good. Generally, in areas with turbid water and many sediments, it is easy to accumulate sand and injure seedlings. If the seedlings are in the tillering stage and the early stage of young panicle differentiation, they can be washed with water in the direction of retreating, combined with the removal of rotten leaves and yellow leaves. Good results. Light dew field to apply fertilizer. After the drainage, the rice seedlings resume their vitality, that is, a light exposed field is carried out to enhance the soil permeability and root activity, and the quick-acting fertilizer is supplemented with shallow water after the field is exposed. Generally, 5 kg of urea and 5 kg of potassium chloride can be applied per mu in the tillering stage to promote the differentiation of young ears and strong stalks. If it is at the booting stage, it should be applied 2.5 kg per mu for 3 to 5 days before the break. Foliar fertilizer such as phosphorus and potassium fertilizer is sprayed 1 to 2 times after heading. In the later stage, we insisted on shallow water and humid irrigation to maintain the vitality of the root system, and to improve the seed setting rate and grain weight, so as to make up for the loss of effective panicle loss and the number of kernels caused by the disaster. Wash plants (miao) in time and enhance photosynthetic capacity. The seedlings are flooded. When the water is discharged, the direction of the water flow is taken and the dead leaves and slag are combed with the gums when the seedlings are just exposed. The mud stains of the leaves are washed away, and the photosynthesis is promoted early. In flooded fields, you should also remove the floating objects and wash away the debris from the rice leaves, which will have a good effect on the recovery of the rice seedlings. Proper control of the water layer should not only prevent the dead and dead seedlings, but also improve the rhizosphere environment to promote root vigor. After the submerged rice plants, the roots of the roots increased and the root activity decreased significantly. The soil permeability should be increased and the rhizosphere environment should be improved. High-temperature sunny days can not immediately drain dry water, keep enough water layer during the day to prevent wilting and dry seedlings; 秧 seedlings should drain dry water after 5 pm, and re-fill shallow water in the early morning to promote rapid rejuvenation of roots. Apply fertilizer to promote normal growth. After the tip of the leaf is restored to spit water, the fertilizer is applied in time. Generally, 75 kg of urea can be applied per hectare in the field to promote the recovery of the seedlings and the white roots; the field can be supplemented according to the growth period, and the urea can be applied for 75 kg per hectare at the booting stage. Flower effect. Strengthen pest control. After the rice is damaged, due to the damage of the leaves, the chance of disease is increased, especially the bacterial blight. After being exposed, the damage is often serious, and the sheath blight may also occur seriously. To this end, it is necessary to timely control the drug, as soon as possible to block the incidence of bacterial blight, the agent can choose Ye Qingshuang, Xiaozhuling, etc.; sheath blight prevention and control can choose Jinggangmycin, Shizhuangqing and other agents to prevent disease. Because herbicides can reduce the resistance of seedlings, it is not advisable to use herbicides after flooding. One-stop solution, one machine multi-test
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