The demand of sweet potato for the three elements of nitrogen, phosphorus, and potassium varies with the period of growth. Nitrogen fertilizer absorbed more stems and leaves at the growth stage, and absorbed less during root enlargement. Phosphorus fertilizer absorbed less in the mid-growth stage of stems and leaves, and absorbed more during root enlargement; while the absorption of potassium fertilizer was more than nitrogen and phosphorus from planting to harvesting. As the root swelling period is more pronounced, sweet potato fertilization should be carried out around this characteristic.
1. Fertilizer base fertilizer should be based on farm fertilizer plus microbial fertilizer, supplemented by chemical fertilizer, farmyard fertilizer should be fully decomposed. Can choose to use chicken manure, pig manure, cow dung and other human and animal excrement, the use of Jinbao organic fertilizer fermentation agent for decomposing, fast decomposed, completely decomposed, general maturity is basically completed about 10 days. The amount of basal manure fertilizer accounts for 60% to 80% of the total fertilizer. In general, 667 square meters of fresh potato production 2500 to 4000 kg should be applied to farmyard fertilizer 3000 to 4000 kg. Jinbao Microbiological Fertilizer 2-3 kg/mu, Golden Baby Microbiological Fertilizer is mainly used to improve the soil, and activates the fixed phosphorus and potassium elements in the soil through microbial fermentation, resists double weighting, prevents soil compaction, and improves soil salinization. , To increase the utilization of chemical fertilizers to achieve the purpose of increasing production and income, and at the same time with the application of calcium superphosphate 15 ~ 25 kg, 100 ~ 150 kg of plant ash, ammonium bicarbonate 6 ~ 10 kg and so on. Basal fertilizer should be applied in a concentrated and stratified manner. 60% of the basal fertilizer should be applied to the bottom layer when deep plowing, and 40% can be used when planting.
2. The type and timing of fertilization in each period should be well understood.
Miao Fei: raise the seedlings generally follow-up quick-acting fertilizer, after 3 to 5 days after planting combined with seedlings to fill the seedlings, the method is to open a hole about 10 cm in the root near the hole, apply a small amount of urea That is, every 667 square meters of 1.5 to 3.5 kg, immediately after the application of water covered cover soil, can also be used 1% urea water irrigation roots, to supplement the base fertilizer available fertilizer less effective and slow fertilizer effect. At the same time can be foliar spray gold seedlings root seedlings, or directly used for irrigation after dilution, can improve the survival rate of potato seedlings, rooting rate and number of potato seedlings, shorten the seedling period, to achieve the purpose of strong seedlings and seedlings.
Strong cranberry fertilizer: After the sweet potato enters the strong vine growth stage, the growth potential of the underground part grows vigorously, the roots begin to form, and the suction fertility is strong. To accelerate the expansion of the leaf area and increase the photosynthetic production efficiency, the sweet potato should be planted for 30 to 40 days after planting. fat. The fertilization amount is determined by soil fertility and seedling growth, and the growth potential will be increased by 667 to 5,000 m2 of 7.5 to 10 kg of ammonium sulfate or 3.5 to 4.5 kg of urea or 4.5 to 6 kg of ammonium nitrate, 10 kg of potassium sulfate or 100 kg of plant ash. Better growth, the amount can reduce the application. Combined with fertilization, we must also do a good job in time of work such as cultivating and weeding, irrigation and drought prevention.
Promoting potato fertilizer: Preserving potato fertilizer is mainly based on potash fertilizer, which is generally applied 90 to 100 days after planting. Potassium fertilization at the pottage stage can effectively prolong the functional period of leaves, enhance stem and leaf vigor, increase photosynthetic efficiency, promote the operation of photosynthetic products, and promote the expansion of tubers. Generally, potassium sulfate can be applied to 10 kg per 667 square meters, or 100 to 150 kg in plant ash. After the application, watering should be performed once to promote its effectiveness as soon as possible.
Cracking fertilizer: For sweet potatoes with significant premature aging during the expansion period, cracking fertilizers have a significant effect on yield increase. Crack fertilizers generally use 4 to 6 kg of ammonium sulfate per 667 square meters, 400 to 600 kg of water, or use decomposing human waste. 250 kg of urine, 750 kg of water, irrigation along the cracks.
In the mid-expansion of foliar fertilizers, the root uptake function began to decline, and fertilizers should be supplemented with extra-root-chasing fertilizer. Usually, 2% to 5% of superphosphate soaked in 1% or potassium phosphate solution or 0.3% The potassium dihydrogen phosphate solution or 5% to 10% of the ash filtration solution was sprayed after 3:00 pm, spraying 75 kg per 667 square meters, spraying once every 15 days, and spraying twice.
Note that a sweet potato is a chlorine crop. When selecting fertilizers, care should be taken not to use fertilizer containing chlorine. The ammonium dicarbonate should not be used for spreading or surface application. It can be used as a deep-mixed fertilizer particle; when it is used for human and animal wastes. Should be fully cooked; its four grass ash can not be mixed with nitrogen, phosphorus fertilizer, respectively, to be applied. For details contact Beijing Huaxia Kangyuan Technology Co., Ltd., Power, 18001173107
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