The main disease in the seedling stage of dry nursery rice seedlings is blight, once the blight occurs on the seedbed, the treatment is very difficult. Whether or not it can effectively prevent rice seedling blight is the key to the success of the nursery. To prevent rice seedling blight, we should consider the following issues: First, control the pH of bed soil. The pH of the bed soil was measured every three days. The pH of the bed soil was higher than 5.5, and a 2,500-fold sulfuric acid solution was poured, and the pH of the bed soil was adjusted back to about 5.0. Once the blight occurs on the seedbed, the pH of the bed soil is adjusted to about 5.0, and the spread of the disease can be controlled without spraying a very expensive drug; the pH of the bed soil is greater than 6.0, and the spraying of expensive medicine is also effective. Less than expected control effect. The second is to control the moisture in the seedbed and prevent the seedlings from becoming leggy. In the early morning, the rate of water spouting of rice seedlings reached more than 70%, and watering was not conducted on the day. When there was a shortage of water, water was poured at one time and watering times were reduced. The third is to control the temperature in the shed and enhance the low resistance of seedlings to rot. Pre-emergence temperature in the greenhouse is maintained at 28°C to 30°C, after emergence, to 1.5 leaf stage, 22°C to 25°C during daytime, 1.5 leaf to 2.5 leaf stage, 20°C to 22°C during daytime, 2.5 leaf to 3 leaf stage, Keep 18°C ​​to 20°C during the day and emerge to the 3rd leaf stage. The nighttime temperature should not be lower than 10°C. It must not be higher than 15°C. After the three-leaf stage, the seedlings gradually adapt to the external environment. Pass, no special cooling weather, do not cover the shed. The fourth is not flash seedlings. For many consecutive days, the weather is cloudy and low temperatures. After sunny days, do not suddenly ventilate. Ventilate slowly and slowly. Practice the adaptability of the seedlings to the environment.
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