Remedial measures for waterlogged crops Rice

Rice has a strong tolerance to waterlogging, with no top for about 3 days, and there are still about 80% of the surviving rice seedlings, as long as the management is strengthened; if the rice seedlings are not topped for 4-7 days, 50%-80% of the survived rice seedlings should be homogenized and replenished in time to ensure a sufficient population; if there are only about 30% of the surviving rice seedlings without the top for more than 7 days, replanting or replanting other crops should be considered. It is necessary to take measures in accordance with local conditions, give classified guidance, and conscientiously do a good job in the post-disaster management of rice. As long as there are green leaves in the rice seedling, the inside of the leaf sheath is still green and has a certain hardness, the white root or root system is light yellow, the heart leaf can be seen 2 or 3 days after the water comes out, the new root is exposed to the tip, the main stem is peeled, and the growth point is bright, not atrophied and not turbid. This kind of rice seedlings can survive. 3-5 days after discharge, depending on the growth process and the number of basic tillers, the area of replanting should be reduced as much as possible.

To eliminate stagnant water in the field as soon as possible, we should seize time and compete for speed, and take all necessary and possible means to remove stagnant water and reduce the harm of waterlogging. We should pay close attention to dredging the farmland ditch system, open the drainage facilities, lower the peripheral water level, and ensure that the stagnant water in the field can be discharged. However, we should pay attention to the high temperature after the rain, so we can not drain the water in the field, we should retain the water layer properly, so as not to damage the seedlings by high temperature.

Recovery fertilizer should be applied as early as possible after flooding, timely fertilization should be applied to promote the recovery of rice growth after the disaster. The main types of fertilizers are available nitrogen fertilizer, combined with phosphorus and potassium fertilizer. The amount of fertilizer applied can be less in the fields with short submerging time and less damage to rice seedlings, and more fertilizer should be applied in some fields with long flooded time and severe damage to rice seedlings, but the method of light application must be taken many times to prevent excessive fertilization at one time, resulting in fertilizer damage to seedlings. At the same time of topdressing recovery fertilizer, the combination of "upper spraying and lower topdressing" was adopted to spray high efficiency foliar fertilizer to promote recovery growth.

After strengthening the water slurry management and drainage, on the basis of settling the floating mud in the paddy field, adhere to dry and wet, intermittent irrigation of fresh water, not only maintain soil ventilation, but also meet the water needs of rice seedlings.

In direct seeding rice fields affected by continuous rainfall, it is necessary to strengthen the control of gray planthopper. The leaves and tillers born after the recovery of flooded rice are green and vulnerable to rice planthopper, leaf borer, stem borer, sheath blight, bacterial blight and so on. In the near future, it is necessary to do a good job in the control of the second generation of gray planthopper in Jianghuai and Huaibei regions, especially in direct seeding rice fields and late planting fields.