How to apply fertilizer in the later stage of sweet potato

As a very common food crop in China, sweet potato is basically planted in all parts of our country. When planting sweet potato, fertilization is very important and is the key to ensure the high yield of sweet potato. When fertilizing, it is necessary to apply fertilizer reasonably according to the growth period of sweet potato, so how to apply fertilizer when sweet potato enters the later stage of growth? Today, the editor will give you a brief introduction. Let's take a look at it.

1. Topdressing during the expansion period

It is the most critical period of topdressing when the stem of sweet potato expands in the later stage. At this time, the soil at the root of the sweet potato will begin to crack, and the sweet potato has the greatest demand for fertilizer at this time. Many people start with a large number of dads, and then stop fertilizing at a later stage. In fact, this is wrong, because in the later stage of sweet potato growth, it is easy to be malnourished. At this time, if you add an appropriate amount of compound fertilizer and organic fertilizer, it will provide adequate nutrition for the expansion of sweet potatoes. Then we should pay attention to weeding to avoid weeds and sweet potatoes grabbing growth nutrition.

2. Foliar topdressing

In the late growth stage, the root absorption capacity of sweet potato is relatively weak. Therefore, we should also pay attention to do a good job of foliar topdressing and select fertilizers according to the planting area and the growth of sweet potatoes. For example, if the growth is weak in the hills, plains and premature senility, then the right amount of urea can be sprayed. And if the soil is fertile and growing vigorously, then you can spray an appropriate amount of potassium dihydrogen phosphate or calcium superphosphate. For normal fields, urea and potassium dihydrogen phosphate can be combined, about once a week, lasting about three weeks. Each time the amount of foliar fertilizer sprayed per mu is kept at about 80-90 kg, preferably in the sunny evening.

3. Points for attention

When applying fertilizer, we should control the nutrition proportion of fertilizer according to the law of fertilizer demand of sweet potato. For example, sweet potato has the highest demand for potash fertilizer, followed by phosphate fertilizer, and finally nitrogen fertilizer. Because when we fertilize in the later stage, we should pay attention to phosphate fertilizer, with the right amount of phosphate fertilizer, little or no nitrogen fertilizer. Then when spraying foliar fertilizer, we can use Yijianning high potassium foliar fertilizer for sweet potato. If it is drip irrigation, it should be based on water-soluble fertilizer to ensure that the fertilizer can follow the water to the root, and pay attention to covering soil and watering after fertilization.

Then pay attention to the work of lifting the vine of sweet potato. Many farmers like to turn vines in the later stage of sweet potato, which is very disadvantageous to the growth of sweet potato. Because this will lead to sweet potato leaf nutrient absorption hindered, affecting sweet potato expansion, resulting in a reduction in yield. Therefore, we mainly have to lift the vine, which is to cut off the root and transport the nutrients produced by the leaves of the sweet potato plant to the sweet potato pieces to improve the yield of sweet potato.

The above is a brief introduction of how to apply fertilizer in the later stage of sweet potato. That's all for today's introduction. This article is for reference only. I hope it can help you all.