Potassium Fertilizer should be re-applied in the Middle-term Management of seed Sweet Potato

This year, the sweet potato cuttage period encountered drought, the survival rate is low, so the planting density has decreased, which will affect the sweet potato yield this year. Potassium is the most needed fertilizer in sweet potato life, especially in the expansion period of sweet potato, if potassium fertilizer is applied at this time, it can meet the potassium demand of sweet potato, and appropriate amount of phosphate and nitrogen fertilizer can be applied together. It can greatly promote the expansion of sweet potato, increase the rate of large potato, and significantly increase the yield per unit area.

1. Apply plant ash. Plant ash contains a large amount of potassium, but also contains phosphorus, calcium and other nutrient elements, proper application can play a significant role in increasing production. The specific measures are as follows: sweet potatoes that have been ridged can choose to be spread without wind in the evening, and 4 baskets of plant ash per mu are required to be evenly scattered on the leaf surface; cuttage is relatively late, rattan seedlings are less than 50 cm, and potato fields that have not been ridged at present can be mixed with 1 kg urea with 4 turnip baskets of vegetation ash per mu, which is applied at the base of the root, a seedling and a handful of ash fertilizer.

2. Topdressing potassium dihydrogen phosphate. The unsprouted plots can be sprayed evenly on the leaves after 4 p. M. in sunny or cloudy days with 40 kg of potassium dihydrogen phosphate solution of 3/1000 kg and urea 0.5-1kg per mu, and the mu of potato-bearing plots can be mixed with 500g-750g potassium dihydrogen phosphate plus urea 1.5kg-2kg, mixed with water 200kg-250kg, stirred evenly, fully dissolved, and then poured along the root.