Grow sweet potato potash fertilizer to make your yield double.

Sweet potato is a potassium-loving crop. Among the three elements of nitrogen, phosphorus and potassium in fertilizer, the requirement of potassium is the largest, followed by nitrogen and phosphorus. The following editor will teach you how to plant sweet potatoes and apply potash fertilizer!

The best ratio of N, P and K fertilizer for planting sweet potato is about 2 ∶ 1 ∶ 3. As a tuber crop, sweet potato needs a lot of potassium in the growth process, only relying on potassium in the soil is not enough, we must apply potassium fertilizer. If the sweet potato is deficient in potassium in the early growth stage, the internodes will appear, the petiole becomes shorter and the leaves become smaller. In the later stage, the old leaves with potassium deficiency had a serious lack of green between the veins, and gradually necrotic and fell off, which had a great impact on the yield. Therefore, scientific application of potash fertilizer is an important measure for high and stable yield of sweet potato.

1. Applying potassium to base fertilizer

The application of potash fertilizer is the basis of high yield of sweet potato. Therefore, it is necessary to give priority to high-quality organic fertilizer. Because of the poor water and fertilizer conservation capacity of sandy soil, semi-rotten organic fertilizer should be used as base fertilizer, while clayey soil should be treated with rotten organic fertilizer. Combined with ploughing and ridging, 100-150kg of plant ash per mu or 3500-5000 kg of high-quality farm manure containing more potassium should be applied at different levels. When applying plant ash, be careful not to mix it with ammonium nitrogen fertilizer or human feces and urine, so as to avoid the loss of nitrogen volatilization. In addition, sweet potato is a chlorine taboo crop, potassium chloride can not be applied.

2. Soak the potato vine with potassium

Soaking potassium in sweet potato vines can improve survival and promote early onset. The specific method is: 0.5 kg of potassium sulfate is fully stirred with 25 kg of water to prepare a 2% concentration of potassium solution, the cut sweet potato rattan seedlings are soaked in potassium solution, and the top leaf should be out of the water. Generally soak for 1 hour and then take out a little to dry and then plant.

3. Potassium topdressing for potato seedlings

About 40 days after planting, 10 kg potassium sulfate per mu was deeply applied at 7-10 cm at the base of potato seedlings, and then covered with soil to promote the formation and expansion of tuber roots. When the potato vine grows to about 1 meter, in the morning when there is no wind and dew, about 50 kilograms of plant ash is used to spread directly on the leaf surface, which can prevent the potato vine from growing and promote the expansion of potato pieces. In the potato block expansion period, if the soil is moist, more rain, rattan, leaves turn yellow, can apply more plant ash.

4. Foliar potassium spraying

In the late growth stage of sweet potato, foliar spraying potassium fertilizer has obvious yield-increasing effect. Generally, 40-50 days before harvest, 1% potassium sulfate solution or 0.2% potassium dihydrogen phosphate solution or 5% plant ash leaching solution (5 kg of plant ash plus 100 kg water for 24 hours) is sprayed every 7 days or so, a total of 2-3 times, each time 75-100 kg potassium fertilizer solution per mu. It is generally appropriate to spray in the evening to facilitate leaf absorption and improve fertilizer efficiency.

Sweet potato is a root crop in dry land, which requires a large amount of fertilizer and has no obvious mature period. at the same time, soil waterlogging is avoided in the whole growth period. In order to achieve high yield of sweet potato, large amount of fertilizer should be applied in the split mouth stage (stem expansion stage) and reasonable fertilization in the later stage.