How should sweet potatoes be fertilized to achieve high yields?
How can sweet potatoes be fertilized for high yields? Please explain in detail the following three fertilization methods that can increase sweet potato yields: Hole topdressing - use a wooden peg to make a hole about 30 cm deep at 20-30 cm from the main root, put in an appropriate amount of three-element compound fertilizer, and seal it with moist soil. If one hole is made on each side of the ridge, the eff...
How can sweet potatoes be fertilized for high yields? Please explain in detail
The following three fertilization methods can increase sweet potato yields:
Hole topdressing: use a wooden peg to make a hole about 30 cm deep at 20-30 cm from the main root, put in an appropriate amount of three-element compound fertilizer, and seal it with moist soil. If one hole is made on each side of the ridge, the effect is even better.
Crack topdressing: September is the period when sweet potato storage roots expand. When cracks appear in the surface soil, applying fertilizer through the cracks can promote the expansion of sweet potato storage roots. Fertilizers that can be used for crack irrigation are: 750-1000 kg of human excrement and urine per mu, mixed with 500 kg of clean water and poured into the cracks at around 5 p.m.; 500 g of potassium dihydrogen phosphate per mu, first dissolved in warm water, then mixed with 500 kg of clean water and poured into the cracks; 2.5 kg of urea and 10 kg of superphosphate per mu, dissolved in a small amount of water, then diluted with 500 kg of water and applied to the roots; 100 kg of plant ash per mu, dissolved and soaked for 5 hours, filtered to remove impurities, then diluted with 500 kg of water and applied to the roots. In addition, it is worth noting that no matter which of the above methods is used for root irrigation, the action should be slow. After applying the fertilizer solution, the crack openings should be immediately sealed tightly with fine surface soil. This can reduce the volatilization of fertilizer efficiency and the evaporation of water, and also play a role in drought resistance and seedling protection.
Foliar topdressing: there are many types of foliar fertilizers suitable for spraying on sweet potato. Commonly used ones include 1%-2% urea solution, 2%-3% superphosphate extract, 5%-10% plant ash extract, 0.3% potassium dihydrogen phosphate solution, etc. As for the spraying time, around 5 p.m. during the day is best. Generally, 75-100 kg is sprayed per mu, and it is sprayed again after 5-7 days, for 2-3 consecutive sprays.
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