The roots of sweet potato are deep and wide, stems and vines can take root, attracting strong fertility. Sweet potato is a crop that needs high fertility, and potassium fertilizer has the greatest impact on the yield of sweet potato. In order to obtain high yield of sweet potato, it is necessary to give enough fertilizer to meet the normal nutrient requirements for normal growth of the sweet potato at each growth stage. Fertilization should master the principle of “mainly organic fertilizer, supplemented by chemical fertilizers, base fertilizers, and topdressing supplements”. 1. When applying basal fertilizer to ridging, combine deep ploughing with base fertilizer. In general, 2,500 kilograms of pig manure, green manure, and compost are applied in Mushi and 20 kilograms of superphosphate are used. Basal depth should be about 20 centimeters away from the dome, so as to avoid premature and premature aging. 2. Lightly nod the head and nod the head and put on the head and combine it with the white water. The nitrogen-based water and fertilizer is the main ingredient. About 10 cm beside the potato seedlings, the shallow ditch is drawn, and 1,000 kg of excrement and urine are excreted per acre. Due to insufficient basal fertilizer, a small amount of chemical nitrogen fertilizer may be added appropriately. But not too much, otherwise it is easy to cause leggy, unfavorable potato. Nourishing fertilizer to avoid soil miscellaneous fertilizer on rattan, so as not to produce a large number of fibrous roots affect the tuber. 3, re-application of clip edge fat clip edge fertilizer also known as promoting potato fertilizer, in the stem vines before the extension to the ridge application. The ridges and soils 8 cm away from the head of the rattan will be sun-dried, and the manure excrement will be 2500 kg or 15 kg of urea and 15 kg of potassium sulfate. The fertilizer will be applied to both sides of the ridge, and then combined with cultivator weeding and clearing. 4. Before and after applying the cracked fertilizer, the growth of vine leaves reaches a peak. It is a critical period for the rapid expansion of the tubers. It should be combined with drought-proof application of liquid fertilizer for 1 time to promote nutrient accumulation and delivery to the root tuber, which can achieve significant yield increase. Mu Shi human excrement 1000 kilograms or urea 8 kilograms of water, pouring along the cracks of the potatoes. Daejeon’s vegetative growth can be magnified by applying 7 kg of potassium sulfate to water and 150 times the volume of water to prevent leggy and speed up the expansion of tubers. 5. Timely top-dressing sweet potato 1–2 months before harvest, especially in areas with phosphorus and potassium deficiency, 2%–5% of superphosphate soak, 0.3% of potassium dihydrogen phosphate solution or 5%–10 % filtered grass gray water 100 kg root dressing 2 - 3 times, each time about 15 days apart, to prevent premature aging, enhance the ability to assimilate, increase tuber yield, drying rate and the rate of powder have a good effect. Excerpted from China Agricultural Press>

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