Cleverly chasing sweet potatoes to expand fertilizer three methods
For the top hole dressing method, use a wooden pestle. In the 20 to 30 centimeters away from the main root of sweet potato, drill a hole about 30 centimeters deep, apply appropriate amount of compound fertilizer, and seal it with wet soil. If you drill a hole on both sides of the ridge, the effect is better. This method can increase production by about 20% per mu.
When the sweet potato expands and there is a crack on the ground, 500 grams of potassium dihydrogen phosphate is added to 400 kilograms of water per acre, or 2.5 kilograms of urea and 10 kilograms of superphosphate are used, 500 kilograms of water is added, and the cracks are filled with fertilizer solution. Irrigation 0.7 to 1 kg. After 15 days, the supernatant of 100 kilograms of ash and 500 kilograms of water (soaked for 4 hours) was used to perforate and crack, and the cracks were sealed with soil after irrigation. This method can increase production of more than 300 kilograms per mu.
The foliar dressing method foliar spraying 0.3% potassium dihydrogen phosphate solution, spray once every 7 days. This method can increase production by 18% to 20% per mu.
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