Tips for fertilizing crops after floods

After the flood, crops and soil properties are significantly impacted, which affects their growth and development. As a result, both the flooded crops and newly transplanted or planted crops require adjusted fertilization rates and methods to recover effectively. For crops that were submerged for a short period and show less damage with good yield potential, applying urea at 5 to 7.5 kg per mu after flooding can help stimulate growth. In the later stages of crop development, foliar feeding with potassium dihydrogen phosphate is also beneficial. For late rice, the solution concentration should be between 0.1% and 0.2%, with about 50–75 kg applied per acre. For cotton, a small amount of urea can be added along with the solution, and the concentration should be around 1%. Since late rice may experience delayed growth due to the flood, it's important to ensure safe panicle formation before the Cold Dew season. Spraying gibberellin (920) can help accelerate this process. The recommended concentration is 2–3 grams of gibberellin per ton of water. Alternatively, dissolve 3–3 grams in 10 kg of water and then dilute to the desired concentration to promote earing and early maturity. For autumn-sown crops affected by the disaster, the general principle of fertilization is to apply a reduced amount—about 1/3 to 1/2 of the usual rate. Base fertilizer can include compound fertilizer, with an application rate of 25–40 kg per mu. Topdressing can be done using manure or urea. It’s important to adjust the fertilizer 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. It is advisable to apply heavy base fertilizer and light topdressing, using 80–90% of the total fertilizer as base fertilizer. This approach helps avoid excessive nitrogen in the late growth stage, which could delay harvest, reduce yield, or interfere with planting the next season’s crops. Adjusting the NPK ratio by increasing nitrogen content is acceptable, but it should mainly be used as base fertilizer. The application rate should be about half of the previous year’s level, and should not exceed two-thirds of the annual dosage. In the later growth stages, spraying 0.2% potassium dihydrogen phosphate solution 1–3 times, with an interval of about one week, can improve cold resistance and promote early maturity and higher yields. (Wu Yili, Shouguang City, Shandong Province)

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