In the process of sweet potato, the demand for nitrogen, phosphorus and potassium in the growth process is the highest in potassium, followed by nitrogen and phosphorus. The ratio of the three elements of strontium, phosphorus and potassium is generally 1:1:2.5. The functions of the three elements are different and cannot be replaced by each other. According to the local soil conditions, climatic conditions and the characteristics of different varieties of growth, rational application of fertilizers, master the principle of "pre-promotion, central control, and late prevention of premature aging" to achieve the best yield-increasing effect. In the fertilization, we must grasp the following aspects:
1. Add base fertilizer. Mainly organic fertilizer, supplemented by inorganic fertilizer. The application amount of base fertilizer accounts for more than 80% of the total fertilization amount. According to the output of sweet potato per acre, 2500-3500 kg, the base fertilizer should be 3000-4000 kg, and the three-element compound fertilizer 50 kg. Organic fertilizers mainly include soil fertilizers, manure fertilizers, human and animal manure. They are all kinds of complete fertilizers. They are gradually decomposed after application and continue to exert fertilizer efficiency. They are very suitable for the long growing period of sweet potato, but they require full maturity. Therefore, the farmers said: “Sweet potato I like the sewer in the next year. The application method is stratified and staged application, that is, 1/2 of each of the ploughing and ridges, the crude fertilizer is used as the base, the fertilizer is applied, and the combination of depth and light can effectively meet the sweet potato front, middle, and The need for nutrients in the later stages promotes the normal growth of sweet potatoes.
2. Reasonable topdressing. Early application of seedling fertilizer, strong seedling fertilizer, generally 3 to 4 days to 30 days after planting, pouring thin human excrement 2 times, each time according to the condition of the seedlings plus urea 1 to 3 kg per mu. Re-application of potato fertilizer, long potato fertilizer, generally accounted for 20% of the total fertilization amount, the time is about 50 days after planting, relying on one side of the ridge to break the soil and fertilize, also called the edge fertilizer. It is also possible to apply the crack fertilizer in time when the sweet potato ridge is back cracked, and generally apply the manure and manure to the appropriate amount of ammonium bicarbonate.
3. Root dressing. Generally, in the late growth stage of sweet potato, the leaf surface is sprayed with 0.2% potassium dihydrogen phosphate solution, 0.5% urea solution and 2% to 3% calcium superphosphate solution. It is best to add a bag of Tianfengsu or Shuo per acre. Feng 481 can effectively extend the functional period of the blade, and increase the spraying time of the product. It should be sprayed once every 7 to 10 days in the evening, for a total of 2 or 3 times.
Huaxian Agricultural Technology Promotion Center Lu Shuguang
1. Add base fertilizer. Mainly organic fertilizer, supplemented by inorganic fertilizer. The application amount of base fertilizer accounts for more than 80% of the total fertilization amount. According to the output of sweet potato per acre, 2500-3500 kg, the base fertilizer should be 3000-4000 kg, and the three-element compound fertilizer 50 kg. Organic fertilizers mainly include soil fertilizers, manure fertilizers, human and animal manure. They are all kinds of complete fertilizers. They are gradually decomposed after application and continue to exert fertilizer efficiency. They are very suitable for the long growing period of sweet potato, but they require full maturity. Therefore, the farmers said: “Sweet potato I like the sewer in the next year. The application method is stratified and staged application, that is, 1/2 of each of the ploughing and ridges, the crude fertilizer is used as the base, the fertilizer is applied, and the combination of depth and light can effectively meet the sweet potato front, middle, and The need for nutrients in the later stages promotes the normal growth of sweet potatoes.
2. Reasonable topdressing. Early application of seedling fertilizer, strong seedling fertilizer, generally 3 to 4 days to 30 days after planting, pouring thin human excrement 2 times, each time according to the condition of the seedlings plus urea 1 to 3 kg per mu. Re-application of potato fertilizer, long potato fertilizer, generally accounted for 20% of the total fertilization amount, the time is about 50 days after planting, relying on one side of the ridge to break the soil and fertilize, also called the edge fertilizer. It is also possible to apply the crack fertilizer in time when the sweet potato ridge is back cracked, and generally apply the manure and manure to the appropriate amount of ammonium bicarbonate.
3. Root dressing. Generally, in the late growth stage of sweet potato, the leaf surface is sprayed with 0.2% potassium dihydrogen phosphate solution, 0.5% urea solution and 2% to 3% calcium superphosphate solution. It is best to add a bag of Tianfengsu or Shuo per acre. Feng 481 can effectively extend the functional period of the blade, and increase the spraying time of the product. It should be sprayed once every 7 to 10 days in the evening, for a total of 2 or 3 times.
Huaxian Agricultural Technology Promotion Center Lu Shuguang
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