The main influencing factors of rice seedlings in saline-alkali areas are salt and alkali damage, and rice blight and rice rotten and mite diseases are also relatively heavy. Therefore, it is important to improve the breeding of rice seedling beds, to prevent the possible occurrence of diseases, and to control the temperature and moisture.
1. Seed disinfection: In the spring of 2006, due to the low temperature during soaking seeds in rice, and the physiological races of some varieties of mite, the disinfection effect of some conventional soaking agents was poor, and the occurrence of mite was common. In view of this situation, the net vaccine is added to the penetrant and the auxiliary ingredients are adjusted, so that the effect of the mite seedlings is more than 99%; and the effect of strong seedling, rooting and tillering is obvious. 100 grams of dead seedlings can be soaked in 40 kilograms, can be soaked at room temperature and room temperature, usually immersed for 5 to 7 days to germination.
2. Bed treatment: salt and alkali seedlings, seedbed bed should choose a higher and flat terrain, leeward sunny, there is a source of water to make a bed. The bed is made into a deep ditch high bed, which is good for salt and alkali infiltration and drainage. It is best to deepen 10 cm before the first year of the seedbed, add a proper amount of farmyard manure, and cover the straw for the winter. Before the sowing in spring, the diammonium or compound fertilizer is sprinkled on the bed surface, the application amount is 30-50 g per square meter, and the crucible is evenly flattened, and then poured with 1000 times of liquid sulfuric acid water until the bed surface water seeps dry. Spread the isolation layer on top. The barrier layer can be taken locally. Such as rice husks, waste woven bags, perforated mulch films, or with simple plastic trays, throwing trays, floppy disks, etc.
3. Preparation of nutrient soil: Take the dry soil of salt and alkali (no herbicide applied to dry field) and mountain soil. Use a 5 mm sieve to sift, add 30% organic fertilizer or grass carbon soil, and then add rice seedling nutrient, such as Jixin medicine fertilizer acid mixture, nursery seedling, strong seedling essence, three-function conditioning agent. Each bag can be mixed with 200-250 kg bed soil and 100-120 seedlings. The mixed nutrient soil can be laid flat on the insulation layer or placed in a tray for seeding.
4. Watering and sowing: After the nutrient soil is flattened, the surface is poured with 1000-1500 times of sulfuric acid water, and then planted. The amount should not be too large, and 250 to 300 grams of seed per square meter is suitable.
5. Covering soil, seedling bed herbicide: After sowing , cover the soil with a nutrient-mixed bed , the thickness of 1 cm is appropriate. Then, the seedbed is sealed with a herbicide, and the mixture is mixed with fine soil or fine sand and evenly spread on the bed surface to cover the mulch film and the shed film. 50 grams per bag, the seedling can handle 20 square meters, and the throwing plate can handle 30 square meters.
6. Anti-blight disease: 1.5 seedlings are planted in front of the leaves, once dry or dry, and each bag can handle 40 square meters of seedbeds. After the seedling 2.5 leaves (dilute period), if the seedlings are long, the root system is not good, and it is easy to get blight. In the early stage of the disease, it can be used once or once, and the net must be poured into the disease, and it can be sent out in 3 to 5 days. The new root grows new leaves. During this period, if the bed surface is seriously alkalinized, it can be poured with 2000 to 2500 times of acidified water.
7. Topdressing: After the 2.5 seedlings, the appropriate application of ammonium sulfate according to the color of the seedlings is 50-60 grams per square meter.
8. Note:
1 Before planting, the bed and bed surface must be watered, and water should be poured as little as possible before the emergence of 2 leaves. Mainly to control the upper length, to promote root development.
2 After the seedlings are out, the film should be removed in time. The temperature in the shed should not exceed 30 °C. The high temperature should be ventilated in time to avoid high temperature burning.
After 32.5 leaves, the temperature is controlled within 25 °C. The shed should be ventilated and watered in time.
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