After the growth and development of spring vegetables enters the middle and late stages, the plant needs to increase the amount of fertilizer, which is prone to de-fertilization, leading to premature senescence of the plants. While appropriately increasing the number of watering and the amount of watering, the fertilizer is applied once every 7 days in combination with watering. . Topdressing should master the principle of “small number of times†to avoid waste caused by excessive application of chemical fertilizer at one time, or rooting caused by excessive concentration. Pay attention to balanced fertilization and increase the amount of phosphorus and potassium fertilizer to increase the resistance of the plant.
Each time, the application of potassium fertilizer is 15-20 kg per mu or 20-30 kg of NPK fertilizer; 20-30 kg of urea can also be used, and it is alternately applied with 300 kg of decomposed chicken manure (dew water) or potassium treasure. In spring, the low temperature is easy to cause the root activity of the plant to decrease, the ability to absorb fertilizer is weak, the utilization rate of soil topdressing is low, and the fertilizer efficiency is poor. With 0.2%-0.3% urea or potassium dihydrogen phosphate for foliar topdressing, nutrients can be quickly and effectively supplemented. Meet the needs of fertility, and achieve the purpose of strengthening the premature aging.
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