Should be based on the local soil conditions, climate conditions and the characteristics of different varieties of sweet potato growth, the rational application of fertilizers, and only master the "pre-promotion, in the control, late prevention of premature aging" principle, in order to achieve the best increase in production. Specifically grasp the following aspects:
1. Add base fertilizer. Mainly organic fertilizer, supplemented by inorganic fertilizer. The amount of basal fertilizer used accounts for more than 80% of the total amount of fertilizer. According to the yield of sweet potato of 2,500 to 3,500 kg per 667 square meters (1 mu), 3000 to 4,000 kg of base fertilizer and 50 kg of three-element compound fertilizer should be applied. Organic manure mainly includes miscellaneous fertilizers, manure fertilizers, and manure and livestock manure. It is a complete type of fertilizer. It gradually decomposes after application and continuously exerts its fertilizer efficiency. It is suitable for the long growing period of sweet potato, but requires full maturity, so the farmer said: Every year on the feces. The method of application is stratified staged application, that is, 1/2 for ploughing and ridging, the use of coarse fertilizer, combined application of surface fertilizer, and deep-light combination to effectively meet the needs of nutrients in the early, middle and late stages of sweet potato. Promote the normal growth of sweet potatoes.
2. Reasonably top-dressing. Early Miao Miao fertilizer, strong seedling fertilizer, generally 3 to 4 days after planting to 30 days after planting, pouring thin human fecal urine 2 times, each time according to the situation of the seedlings plus urea 1 to 3 kg per 667 square meters. The potato fertilizer and the long potato fertilizer generally account for 20% of the total amount of fertilizer, and the time is about 50 days after planting. The side of the ridge is broken and soil fertilized, also called clip-side fertilizer. It is also possible to apply the crack fertilizer in time when the sweet potato ridge is cracked, and generally apply the appropriate amount of ammonium bicarbonate to the human feces.
3. Top dressing. The sweet potato is generally grown in the late stage. The leaves are sprayed with 0.2% potassium dihydrogen phosphate solution, 0.5% urea solution, and 2% to 3% calcium superphosphate solution. The spraying time should be in the evening, spraying every 7 to 10 days. Times, spray 2, 3 times.
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