In the late growth stage of sweet potato, reasonable fertilization can prevent premature senescence of the plant, maintain the assimilation ability of the leaves, and promote the transport of nutrients to the roots, thereby increasing yield.
After the sweet potato enters the late growth stage, the absorption capacity of the root system is weakened, and foliar spray fertilizer can be applied. For the weak hilly slopes, plain sands or fields with premature aging tendency, 0.5% urea solution can be sprayed, and 0.2% phosphoric acid can be sprayed on the fields with high growth potential and high fertility level. Potassium hydrogen solution or 2% to 3% of superphosphate leaching solution. Generally, 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture can be sprayed in the field, and sprayed once every 7 to 10 days. Spray a total of 2 to 3 times, spraying 70-100 kg of fertilizer solution per acre. The spraying time is suitable for sunny days and evenings.
After the sweet potato enters the late growth stage, the absorption capacity of the root system is weakened, and foliar spray fertilizer can be applied. For the weak hilly slopes, plain sands or fields with premature aging tendency, 0.5% urea solution can be sprayed, and 0.2% phosphoric acid can be sprayed on the fields with high growth potential and high fertility level. Potassium hydrogen solution or 2% to 3% of superphosphate leaching solution. Generally, 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture can be sprayed in the field, and sprayed once every 7 to 10 days. Spray a total of 2 to 3 times, spraying 70-100 kg of fertilizer solution per acre. The spraying time is suitable for sunny days and evenings.
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