How to control blight when raising rice seedlings

How to prevent and control seedling blight when rice seedlings are raised? It is pointed out that although dry seedling bed of rice is not easy to rot, it is most likely to cause seedling blight and death, the light is 20%-30%, the heavy is more than 50%. The following measures can effectively control seedling blight. 1. Acid-regulating treatment of soil: neutral and alkaline soil should be acid-regulated before sowing, and the pH value should be adjusted to below 6, which can effectively control the damage of blight. The specific method is as follows: testing the soil before sowing, applying 30- 40g of special acid-regulating fertilizer per square meter for pH value of 6-6.5, and 40- 50g for pH value of 6.5-7, applying it one day before sowing, and fully mixing with the soil to adjust the pH value of the soil to 4.5-5.5. 2. Disinfect the seedbed soil to avoid soil transmission: after acid treatment, the seedbed is diluted into 600 times aqueous solution with 70% dixon per square meter, and evenly sprayed on the seedbed. In case of sunny days, the amount of dixon is halved, otherwise it will be burned. 3. Do not sow too densely to avoid weak seedlings: mastering the sowing amount is a key link in cultivating dry seedlings. Generally, 50-55-day-old seedlings are cultivated, and the seeding amount per square meter is 20-25g. Such as too dense sowing, thin seedlings, resistance weakened, susceptible to blight, and strong seedlings are resistant, not easy to infect blight. 4. Chemical control: 1 leaf 1 heart to 2 leaves 1 heart stage, most likely to occur blight infected dead seedlings, can be used 600 times solution of Dixong or 500 times solution of Likuling for foliar spray, spray once every 5-7 days, spray twice, especially Dixong has special effect on controlling blight. 5. Overcome low temperature to avoid inducing seedling blight: early rice sowing to seedling should be mainly kept warm, and the temperature inside the membrane should be kept at 30-32℃; When one leaf and one heart are planted, temperature control and humidity control should be given priority to, and the temperature inside the membrane should be kept at 25℃; When two leaves and one heart are planted, the membrane should be opened from 10 a.m. to 4 p.m. on sunny days, and the membrane should be opened for 1-2 hours at noon on cloudy days. In rainy days, the membrane should be opened for ventilation, but the temperature inside the membrane should not be lower than 12℃, otherwise it is easy to induce seedling blight, and the membrane should be opened when three leaves and one heart are planted. Click to get mass rice planting technology Click to get mass grain planting technology