Perforation and topdressing method Using a wooden coffin, at a distance of 20 to 30 cm from the main root of the sweet potato, a hole of about 30 cm deep is applied, and an appropriate amount of ternary compound fertilizer is applied and sealed with wet soil. If you use a hole on each side of the ridge to topdress, the effect is better. This method can increase production by about 20% per mu. When sweet potato dressing method crack enlargement, cracks in the ground, 500 gram of water per acre with potassium dihydrogen phosphate 400 kg, or 2.5 kg urea and superphosphate 10 kg, 500 kg water was added, dubbed fertilizer liquid filling cracks per Iot 0.7 to 1 kg. After 15 days, the supernatant of 100 kg of ash and 500 kg of water (soaked for 4 hours) was used to grout the cracks. After the irrigation, the cracks were sealed with soil. This method can increase the yield per mu by more than 300 kg. Foliar topdressing method Foliar spray 0.3% potassium dihydrogen phosphate solution, spray once every 7 days. This method can increase production by 18%~20% per mu. |
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