Rice rotting occurs in the early years when temperatures are low in early spring. When it is serious, not only the seeds are lost, but also the lack of crops is caused. When the crops are delayed, the cropping period is delayed and the yield is affected.
Rice gill disease is the general term for the death of rice seeds and seedlings during the field stage. There are two types of rotten roach: physiological rotting and disseminated rotting. Physiological rotting refers to bad rotten species, rotten buds, black roots, blue and dry, yellow dry, dead seedlings and other symptoms caused by adverse environmental conditions. Infestation rot refers to rice blight caused by cotton rot, spoilage bacteria and Fusarium, cotton rot, rice seedling disease.
Control methods: 1. Select seed selection. Seeds of high purity and cleanliness, do a good job of drying seeds before soaking, and increase the germination rate and vitality of seeds.
2. Renovate and rectify Putian: Putian should choose to shelter from the sun, have a high topography, have convenient drainage and irrigation, and have moderate fertility. The site preparation strives to make the bed flat, deep in the trenches, and drains open.
3. Using film breeding. It is best to use arch-type perforated membranes to raise oysters, which can effectively solve the problem of low temperature causing rot.
4. Improve soaking and germination techniques. When soaking germination, the temperature must be properly grasped. Requirements to achieve 36-38 °C, exposed whitehead, suitable temperature 30-35 °C steady germination, cooling 20-25 °C thin spread good buds, so that buds to achieve homogeneous, uniform and strong.
5. Improve the quality of sowing. According to the characteristics of the species, the sowing date, seeding rate and seedling age should be determined. Depots should be used to select seedlings, and it is recommended to plant seedlings with half-grained grains.
6. Strengthen the management of fertilizer and water in Putian. Until the emergence of buds, ventilation and oxygen supply are mainly used. Putian simmering surface is kept moist to facilitate long rooting and rooting. In the 2 leaves and 3 leaf stages, heat preservation and anti-freeze are the main methods, and shallow water can be used for irrigation to prevent dead seedlings. After 3 leaves can be nursed in water. 7-10 days after sowing, five preventions must be done to prevent low temperature, prevent rainwater, prevent high temperature from burning seedlings, prevent floodlights from drying out, and prevent water from seepage. Covered half ditch water. After the rain drained water. Appropriate fertilization, basal fertilizer with a combination of decomposed human urine and phosphate fertilizer is appropriate. Top dressing should be applied in different times. After the seedlings are applied, “breaking rooting fertilizer†should be applied, and “weaning fertilizer†applied at the 5 leaf stage should promote hair roots and hair leaves.
7. Chemical control. Seedling Blight: When the raft is made, dilute 1000 times with 70% Dixon per acre and spray to ensure that no blight occurs in the 3-leaf stage.
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