Sweet potato, chasing and expanding fertilizer, increasing yield, high yield

From mid-August to early October, it is a period of spring and summer planting of sweet potato roots. This period is the key period for the formation of yield, and it is the most time for fertilizer. The following three methods can be used for topdressing. It has an obvious effect of increasing production, generally increasing production by 18% to 20% per mu, and the economic benefits are also significant.

Sweet potato, chasing and expanding fertilizer, increasing yield, high yield

First, the hole eye topdressing with a piece of 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 you play on both sides of the ridge One hole for better results.

Second, when the cracks are fattened and the sweet potato is cracked on the ground, use 500 grams of potassium dihydrogen phosphate per acre, add 400 kilograms of water, or 2.5 kilograms of urea and 10 kilograms of superphosphate, add 500 kilograms of water, and mix with fertilizer to grout, 0.7 per plant. ~1 kg. After half a month, use 100 kg of grass ash and 500 kg of water per acre (soak for 4 hours), filter out the clear liquid and seal it.

Third, the foliar spray fertilizer surface spray 0.3% potassium dihydrogen phosphate, or 0.3% superphosphate and urea aqueous solution, spray once every 7~10 days.

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