To improve water management, the first step is to clear the drainage system and remove excess water from the fields as soon as possible. This helps enhance soil physical and chemical properties and reduces the risk of flood damage. At the same time, it's important to assess whether the rice plants are still alive. If the stems are soft and easily broken, the roots are rotten, or the leaves have withered and fallen off, the plants may be dead and should be replaced with other crops. However, if the root system is strong, the tillering nodes are firm, and the heart leaf is still green, the plant is likely still alive. In rainy weather, drain the field once, and during high temperatures, gradually release water to allow the upper parts of the rice to dry slightly. Drain the field in the afternoon to help the rice recover more effectively.
Once the rice has regrown, it's essential to manage water properly for both disaster relief and drought resistance. Ensure that enough water is stored and protected to support the crop’s development.
For washed or lodged rice plants, immediate action is needed. Clean the leaves with clean water if they are covered in mud. Remove any sediment that has buried the plants and wash them thoroughly to restore their physiological functions as quickly as possible.
Timely application of quick-acting fertilizers is also crucial. After a flood, rice plants require a lot of nutrients, and much of the existing fertilizer may have been washed away. Therefore, it's important to apply available nutrients promptly. However, since the root system is weak after flooding, avoid applying large amounts all at once. Apply fertilizer after drainage, about once a week, using around 10 kg of urea per acre. Later, based on the seedling condition, you can apply granular fertilizer, approximately 10 pounds of urea per acre. After heading, applying "920" (gibberellic acid) and potassium dihydrogen phosphate can help promote ear formation and improve yield.
Pest control must also be strengthened. Flooded rice is more susceptible to pests and diseases due to weakened resistance. Once the rice starts to recover, its leaves become greener and more attractive to pests like the leaf roller and planthopper. It's important to monitor and manage these pests effectively to prevent further damage. Use scientific and targeted methods to ensure effective control.
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