When is the best time to apply topdressing to sweet potatoes? An analysis of the best topdressing time
When is the best time to apply topdressing to sweet potatoes? Please give guidance. From late August to early October is the tuber bulking period for spring and summer sweet potatoes. This period is the key period for yield formation and also the period with the highest fertilizer demand. The following three methods can be used for topdressing. 1. Hole-eye topdressing method: 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 well with moist soil. If one hole is made on each side of the ridge, the effect is even better. This method increases yield by about 20% per mu.
When is the best time to apply topdressing to sweet potatoes? Please give guidance.
From late August to early October is the tuber bulking period for spring and summer sweet potatoes. This period is the key period for yield formation and also the period with the highest fertilizer demand. The following three methods can be used for topdressing.
1. Hole-eye topdressing method: 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 well with moist soil. If one hole is made on each side of the ridge, the effect is even better. This method increases yield by about 20% per mu.
2. Crack topdressing method: when cracks appear in the ground as the sweet potatoes bulge, use 500 g of monopotassium phosphate per mu, add 400 kg of water, or 2.5 kg of urea and 10 kg of superphosphate, add 500 kg of water, prepare a fertilizer solution and pour it into the cracks, 0.7-1 kg per plant. Half a month later, use 100 kg of plant ash per mu plus 500 kg of water (soak for 4 hours), pour the filtered clear liquid into the cracks, and seal them tightly. This method increases yield by more than 300 kg per mu.
3. Foliar topdressing method: spray the leaves with a 0.3% monopotassium phosphate (or 2.5% potassium sulfate, 10% plant ash, 2% ammonium sulfate, 0.3% superphosphate, 0.3% urea) aqueous solution once a week. This method increases yield by 18%-20% per mu.
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