In the pre-sowing preparation and nursery stage of paddy field production, the quality of seedlings is often degraded due to improper seed management or seedling management, and the resistance is poor, resulting in the occurrence of rice disease. Therefore, farmers should pay attention to the following when nurturing rice problem:
First, buy rice varieties
To reputable large-scale seed-supplying units to purchase rice seed and strictly disinfect the seeds to completely eradicate rice bakanae pathogens.
Second, strictly control the amount of sowing
For dry seedlings, 150-200 grams of sowing wet seed per m2 are planted; 2-3 pieces of seedlings are thrown per hole; when seedlings of 2.5 blade age are raised in trays, 120 grams of sows are sowed in each seed; when 3.5 years of seedlings are grown, 80 grams of seed germination sowing; seedlings of 4.5 leaf age, sowing 60 grams of wet shoots. Pour water thoroughly before sowing, and spread the seeds evenly on the surface of the bed or disk.
Third, control the temperature and humidity in the shed
1. Temperature Management Before the emergence of 2.5 leaves, the temperature in the greenhouse is controlled below 30°C. After the seedlings grow to 2.5 leaves, the temperature in the greenhouse is controlled below 25°C. In the growth process of rice, generally high temperature long leaves, low temperature long roots. Therefore, temperature management should adhere to the measures to promote root growth and strictly control the temperature. It was observed that during sunny days, the temperature in sunny days was doubled with the temperature in the shed, so this rule can be used. When the temperature is above 15°C on that day, small vents should be left as early as possible, and the air vents should be expanded gradually as the temperature increases.
2. Water management Water management is the most important technique in the process of seedling raising. Each time watering is less and the attendance will affect the temperature of the seedbed, and it will easily lead to leggy and affect the development of roots. Therefore, watering as little as possible during the nursery. The standard for watering is when the morning sun comes out. If there are large drops of water on the tip of the rice leaf (this droplet is not a dewdrop but a water spit from the physiological role of rice itself), it should not be watered. Beads should use one morning and evening watering once. However, the watering of the seedlings in the body of the body is generally difficult to refer to after standard ventilation is started.
Fourth, find out the cause, correct medication
If farmers encounter abnormal growth of rice seedlings, they must not fight drugs blindly. It must be determined whether rice seedlings are phytotoxic or disease-causing, and timely and accurate drug use can be conducive to the development of rice bran.
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