Fertilization methods during the expansion period of sweet potato

The expansion period of sweet potato is from July to September every year, which is the key period for the formation of sweet potato yield, and it is also the period when the most fertilizer is needed. Lack of fertility may affect the yield of sweet potato. So how to apply fertilizer during the expansion period of sweet potatoes? Come and have a look with the editor.

1. Hole topdressing method

You can use a piece of wood, 20 cm from its main root, make a hole about 30 cm deep, put an appropriate amount of ternary compound fertilizer in the hole, and seal it with wet soil. If you punch a hole on each side of the ridge, the effect is better. This fertilization method can increase the yield by about 20% per mu, and this fertilization method can be used for farmers with low yields.

2. Crack topdressing method

When sweet potatoes are expanded, cracks of different sizes often appear in the ground, and we can use these cracks to fertilize. The crack can be filled with 0.5 kg potassium dihydrogen phosphate per mu with 400 kg water, or 2.5 kg urea and 10 kg calcium superphosphate with 500 kg water. Generally pour 0.7-1 kg, half a month later, add 500 kg of water with 100 plant ash per mu, soak it for 4-5 hours, then take the leachate into the cracks, and seal the cracks with soil after irrigation, which can also achieve an obvious effect of increasing production.

3. Foliar fertilizer spraying method

There are many kinds of foliar fertilizers suitable for spraying sweet potatoes. Potassium dihydrogen phosphate can be foliar sprayed with 0.3% potassium dihydrogen phosphate solution once every 7 days, increasing production by about 18% and 20%. In addition, ecological medicine can also be used to thicken the nutrient transport duct of underground fruit, improve the swelling vitality of ground fruit, smooth fruit surface, strong fruit shape, high quality and high yield, and the best spraying time is about 5 o'clock in the afternoon.

The above is the introduction of fertilization methods in the expansion period of sweet potato. I hope it can help you. If you want to know more about it, please follow us.