Post-disaster management and protection of flooded rice

In view of the serious damage of roots and leaves and the serious decline of total tillering seedlings after rice flooding, measures should be taken to raise roots, protect leaves, promote tillers, increase panicle rate, compete for grains and increase weight.

1. Surprise removal of stagnant water in the field. Drainage of stagnant water in the field as early as possible, squatting seedlings in the open field, in order to improve the physical and chemical properties of the soil and eliminate toxic substances. For the fields that have been submerged for a long time, the overcast and rainy weather can drain water at one time; in the hot sun and high temperature weather, it is appropriate to gradually dehydrate, first let the upper part of the rice plant out of the water, dehydration and air regulation at night, daily irrigation and night dew, so as to facilitate the recovery of rice growth.

2. Water slurry management varies from seedling to seedling. After drainage, on the basis of the gradual sinking of the paddy field, the fields with short flooded time and relatively high number of seedlings should be lightly placed for 2 or 3 times; for the fields with heavy disaster and insufficient number of seedlings, the fields should be exposed first and then lightly, so as to strengthen the early tillers and protect the later tillers. After that, according to the characteristics of high tillering proportion and inconsistent growth process, we should pay attention to "nursing rice". Generally, we should still irrigate "horse racing water" 5 days before harvest.

3. Replenish and restore fertilizer in time. The root absorption capacity of flooded rice is weak, so it is not suitable to apply heavy fertilizer at one time. Fertilizer can be applied once after drainage and open field, and again after 5-7 days, with 5 kg urea and 20 kg compound fertilizer per mu. After that, the flower-promoting fertilizer and flower-protecting fertilizer were applied according to the seedling condition, and the extra-root topdressing was carried out properly after heading. In the fields with late growth process, spraying Huimanfeng, "920" and potassium dihydrogen phosphate at the initial heading stage could promote heading neatness, enhance photosynthesis, increase seed setting rate and 1000-grain weight.

4. Strengthen the prevention and control of diseases and pests. The leaves, tillers and stems of flooded rice are relatively tender and vulnerable to pests such as Chilo suppressalis, and the delay in growth and development increases the probability of damage to rice planthopper and Chilo suppressalis; the leaves of flooded rice seedlings are damaged and there are more withered leaves. It is also easy to be infected with bacterial blight, sheath blight and rice blast, so it is necessary to strengthen the control of these diseases and insect pests.