How to remedy the flooding of rice

When the paddy field is flooded below 25 ℃ for 1-4 days, it will not do much harm; when it is flooded for 1-4 days above 30 ℃, it will lead to abnormal fruiting of rice; when it is flooded for 1-4 days above 40 ℃, it will cause rice to die and lose its harvest.

Rice seedlings are flooded, the seedlings are slender, the leaves are yellow, and it is generally difficult to recover; at the tillering stage, the bottom leaves are necrotic, the heart leaves are curled, and the leaves wither after water retreat, but they generally do not rot; at the jointing stage, the plant is thin and weak, and it is easy to lodge and break; at booting stage, the resistance is the weakest, it is easy to appear rotten panicles and deformities, and the seed setting rate decreases; at the filling stage, the bottom leaves are withered and yellow, the top leaves are yellow, sprouting on the panicle, the grain weight decreases, and the rice quality becomes worse. Therefore, remedial measures should be taken in time after rice fields are flooded.

Drain the leaves and grab the drainage, so that the rice seedlings come out of the water as soon as possible, and wash away the mud on the leaves in time. Drainage should be gradually and slowly, not at one time, so as to improve the adaptability of rice plants. The fallen rice seedlings should be righted in time and the rotten and diseased leaves should be cut off.

Topdressing fertilizer in time and spraying fertilizer outside the ear and root in time. According to the seedling condition, 3-5 kg urea per mu was applied. At the extraction and filling stage of flag leaves, potassium dihydrogen phosphate was sprayed outside the roots, the dosage was 75g / mu, 50kg / mu, spraying 1kg / mu.

In the later stage, it is better to adopt shallow water intermittent irrigation after heading, in order to enhance root activity, prolong the life of functional leaves and enhance the stress resistance of rice seedlings. Intermittent irrigation means that after the first irrigation, let it dry naturally for one or two days, and then irrigate the second time to let it dry and wet until it is mature.

Timely control of diseases and insect pests is generally seriously damaged by diseases and insect pests in flooded paddy fields. Jinggangmycin and other pesticides were used to control sheath blight from the end of July to the first ten days of August, and propiconazole and phenylpropiconazole were used to control rice false smut 3-5 days before the break. At the same time, pests such as the third generation of rice stem borer, rice leaf roller and rice planthopper should be controlled in time.