The fertilization experiment showed that the potassium uptake of sweet potato was the most at all stages of growth, and it was higher than that of nitrogen and phosphate fertilizers from planting to harvesting, especially during root swelling. With the swelling of the roots, the amount of potassium absorption increased simultaneously. Production practices have also repeatedly proved that adding sweet potato potassium fertilizer after the expansion period can promote the expansion of potato chips, and the effect of increasing production is very significant. The specific application method is:
1. Append plant ash. Plant ash contains a high potassium content, potassium oxide content of 7.5%, also contains 3.5% of phosphorus pentaoxide and 0.9% of calcium oxide and other nutrients, moderate use of plant ash sweet potato production significantly. The sweet potato field that has been sealed can be applied in the windless evening, with 40-50 kilograms of plant ash per acre. With dew, the ash adheres to the sweet potato leaves without being blown away by the wind, and it is also convenient for potassium to be dissolved by the leaves. The plant ash is highly alkaline and should be applied singly. It should not be mixed with other fertilizers.
2. Spray potassium dihydrogen phosphate. Sweet potato's expansion period is the peak period of absorbing phosphorus and potassium. Spraying potassium dihydrogen phosphate solution absorbs quickly and has high utilization rate. Can be sprayed with 0.3-0.5% potassium dihydrogen phosphate solution per acre 40-50 kg, once every 7 days, sprayed continuously 2-3 times.
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