Sweet potato expansion period to topdress
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Hole-eye dressing method: use a wooden raft, 20 to 30 cm away from its main root, hit a hole of about 30 cm deep, put a proper amount of three-element compound fertilizer, and seal it with wet soil, if it is hit on both sides of the ridge One hole for better results. This method of mu production increased by about 20%.
Crack topdressing method: September is the expansion period of sweet potato roots. When cracks appear in the surface soil layer, the application of crack fertilizer can promote the expansion of sweet potato roots. The fertilizer that can be used for filling is: 750-1000 kg of human excrement per acre, and mixed with 500 kg of clear water and then filled at about 5 pm. 500 grams of potassium dihydrogen phosphate per acre, first dissolved in warm water, then mixed with 500 kg of water, watered in the crack. Use 2.5 kg of urea per acre, 10 kg of superphosphate, dissolve with a small amount of water, and fill the roots with 500 kg of water. After dissolving 100 kg of grass ash per acre, soak for 5 hours, filter out impurities, and fill the roots with 500 kg of water. Immediately after filling the fertilizer, seal the cracks with fine topsoil. This method has increased production by more than 300 kg.
Foliar topdressing method: There are many kinds of foliar fertilizers suitable for sweet potato spraying. Commonly used are 1% to 2% urea solution, 2% to 3% superphosphate leaching solution, 5% to 10% ash leaching solution, 0.3% dihydrogen phosphate. Potassium solution, etc. Spraying time, about 5 pm in the day is good, generally spray 75 to 100 kg per acre, spray again every 5 to 7 days, and even spray 2 to 3 times.
Author: Zhang Feng Xiang