Tips for fertilizing crops after floods

After the flood, the growth of crops and soil properties are significantly impacted. As a result, both flooded crops and newly transplanted or planted crops require adjusted fertilization rates and methods to recover effectively. For crops that were submerged for a shorter period and show less damage, applying urea at 5 to 7.5 kg per mu after flooding can help stimulate regrowth. In the later stages of crop development, foliar feeding with potassium dihydrogen phosphate solution is also recommended. For late rice, the concentration should be between 0.1% and 0.2%, with about 50–75 kg of solution per acre. For cotton, a small amount of urea can be added, with a concentration around 1%. Due to delayed growth after flooding, it’s important to ensure safe panicle formation before the cold dew season. To promote early heading and maturity, you can spray gibberellin (920) at a concentration of 2–3 grams per ton of water. Alternatively, dissolve 3–3 grams of gibberellin in 10 kg of water and then dilute as needed. For autumn-sown crops affected by the disaster, the general principle is to apply an appropriate amount of fertilizer—about one-third to half of the normal rate. Base fertilizer can be applied using compound fertilizer at 25–40 kg per mu, while topdressing can be done with manure or urea. It's essential to avoid over-fertilizing and adjust the amount based on crop growth. Human and animal manure should be limited to 500 kg per mu, and urea should not exceed 5 kg per mu. In some cases, heavy base fertilizer and light topdressing is a better approach. About 80–90% of the total fertilizer can be used as base fertilizer, leaving only a small portion for topdressing, especially nitrogen. This helps prevent excessive nitrogen application in the late stage, which can lead to delayed harvests and reduced yields, or affect the timely planting of the next season's crops. Adjusting the NPK ratio is also important. Increasing the proportion of nitrogen fertilizer is acceptable, but it should mainly be applied as base fertilizer. The application rate should be controlled at about half of the previous year’s level, with a maximum of two-thirds of the annual dosage. In the later growth stage, spraying 0.2% potassium dihydrogen phosphate solution 1–3 times, with a 1-week interval, can improve the crop's cold resistance and promote early maturity and higher yield. (Wu Yili, Shouguang City, Shandong Province)

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