I. Characteristics of rice flooded during seedling stage
In flooded rice, the rice not only fell down, but also suffered from excessive humidity, poor ventilation, and reduced ground temperature. The physiological activities were greatly affected and even died.
1. The rice is flooded for 8-10 days at the seedling stage, and the leaves are dry, but the growth can be resumed;
2. The longer the flooding time, the more dead seedlings;
3. After the water emerged, the seedlings became shorter, the number of tillers was less, the base stems became narrower, and the black roots increased;
4. The survival rate of long-lasting seedlings is high;
5. The survival rate of nitrogen fertilizer application in Putian decreased;
6. The surviving rate of the crickets is higher than that of the crickets in the crickets. After the reclamation, the crickets are less lobed and are more robust than the crickets.
II. Remedial measures after flooding of rice seedlings
The flooding of rice seedlings can preserve seedlings, and it is decided that the water will be released sooner or later. The key to field management is to grab water and enhance management.
(A) Remedial measures after planting seedlings
1, timely cleaning seedlings.
When the water is repelled, use the gums (the area of ​​the paddy field is not large enough to use both hands) to wash the dead leaves and dead seedlings with the direction of the water flow, so that the dirt on the leaf surface can be washed off, which is beneficial to the photosynthesis and the removal of the dead leaves. It can reduce the degree of shelfage and lodging of rice leaves after reclamation. Washing is best done when the seedlings are barely exposed. If the water is washed back into the half-length of the seedlings, the seedlings will have a high lodging rate after retreating and the growth will slow down significantly.
2, timely spraying antibiotics, insecticides.
After washing, seedlings, because of many wounds, flooding fields water field bacteria, insects are more, the injured seedlings are very easy to infect; the next day of water retraction comb, with 50% of the United States and Fumei powder 1000-1200 times, 25% more Bacteria suspension agent 1000-1200 times liquid, 18% insecticide double water spray 200-250 grams per acre.
3, appropriate control of the water layer. After flooded seedlings, the stems and leaves were slender and tender, and the roots accumulated more due to hypoxia-reducing substances. The roots turned yellow and black, no white roots, and the viability was weak. After encountering the hot sun, it is necessary to maintain 10-13cm deep water. After 4pm, it will be drained to the open field, and then the shallow water (which must not be contaminated water) will be re-irrigated in the early morning. If it is cloudy and it rains, it can be completely drained.
4, increase fertilization material timely transplanting.
After shallow water irrigation, 7-7.5kg urea per acre can enhance the ability of the seedlings to restore their vitality as soon as possible, and promote the occurrence of white roots. In the new hairy white root 2.2-2.5 cm, when the new leaves are about 1.5 leaves, they are transplanted. Not only is it easy to pull pods, but because of the white root elongation, the leaf area is small, and after the plant is returned to green, the survival rate of the larvae is greatly improved, and the survival rate is generally more than 90%.
(b) Use herbicides with caution. The use of herbicides before and after the flooding of seedlings will weaken the seedlings, so it is inappropriate to use herbicides in flooded fields.
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