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The first is the bottom. Potassium sulphate or grass ash is preferred, generally 15 to 25 kg of potassium sulfate per acre or 75 to 100 kg of ash. Or apply 5 cubic meters of high-quality farmyard manure containing more potassium. The former can be mixed with nitrogen and phosphorus fertilizer and then applied to the ridge during ridges, such as grass ash; it is best to mix it with wet soil or wet it with a small amount of water before applying it into the ditch. Farmyard manure can be applied during tillage.
The second is to pursue. It can be applied at acupoints, and it can also be rooted with fertilizer water. The sweet potato group can be applied at the opening point of the sorghum, and then covered with soil, and the potassium is about 10 kg of potassium sulfate. In the late growth stage of sweet potato, the potassium-based fertilizer aqueous solution was used for root irrigation to meet the large-scale absorption of potassium in the later stage. The method is to use 3% potassium sulphate or 10% to 20% ash ash leaching solution, or 0.5% potassium dihydrogen phosphate or hay wood ash in the end of August, and the dosage is 100-150 kg.
The third is foliar application. In the late growth stage of sweet potato, 0.2% potassium dihydrogen phosphate solution or 2% potassium sulfate solution and 5% to 10% of ash ash leaching solution may be sprayed. According to the growth status of the potato, an appropriate amount of nitrogen, phosphorus, boron, zinc and other trace elements can also be added. But pay attention when spraying fertilizer: the ash must be soaked for 12 hours and filtered for use. Spray fertilizer should be carried out on cloudy or sunny afternoons before the evening.
Increased production of sweet potato by potassium
Sweet potato is a potassium-producing crop, so scientific and rational application of potassium fertilizer has an extremely important role in further increasing the yield of sweet potato. Especially in the case of the current widespread application of nitrogen and phosphorus fertilizers, it is more practical to lose potassium in the soil. According to practical experience, there are mainly the following methods for adding potassium fertilizer to sweet potato.
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