Sweet potato is a high-yield crop with a long growing season and more fertilizer. It is less in the first and middle stages and more in the middle and late stages. Shizujifei sweet potato throughout the growing season can have a steady stream of nutrient supply, stable raw potato can make steady long. Due to the slow decomposition of the base fertilizer in the early stage, it is necessary to make the stems and leaves grow rapidly. Therefore, it is necessary to properly apply the quick-acting nitrogen fertilizer. In the middle and later stages, the potato cakes are rapidly expanding. Although there is sufficient base fertilizer to meet the needs, it is necessary to increase the yield. Potato fertilizer, mainly compound fertilizer, appropriate application of potassium fertilizer.
Sweet potato basal mainly a variety of organic fertilizer, such as manure pig Kraal, a variety of green manure, crop straws, farmyard manure, soil and other fire. The application method of the base fertilizer is stratified and deep application when the soil is creped. The common practice of applying base fertilizer in high-yield potato fields is to put straw or peanut seedlings, green manure or other crops such as stalks, and add appropriate amount of lime to accelerate the decomposing and neutralizing organic acids; the middle layer of soil and fertilizer, peanut bran, Plant wood ash, plus appropriate amount of phosphate fertilizer; the surface layer is applied to the manure or the manure water with good quality or 5 kg of ammonium sulfate. The advantage of this method is to fertilize the soil both pine, conducive to the growth of root and tuber expanding sweet, but also make the slow decomposition of fertilizers, an endless stream of uniform supply of nutrients, so that the balance of sweet potato grown each growth period, together with the respective period the dressing, achieve the goal of high yield.
The number of base fertilizer to local conditions. The field of fresh potato with an output of more than 5,000 kilograms per mu is generally pressed into the bottom layer with 800-1000 kilograms of green manure straw, the middle layer is then fired and burned, the pig beef barn is about 1500 kg, the surface layer is applied with phosphate fertilizer 30 kg, and the ammonium sulfate is 5 kg. .
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