When is the best time to control the prosperity of sweet potatoes?
Sweet potato will flourish during the growth period, and if it is not solved in time, it will lead to a reduction in production, so when is the best time to control the prosperity of sweet potato?
When is the best time to control the prosperity of sweet potatoes?
1. Control prosperity for the first time: in the first expansion period of sweet potato, the vine is about 35-45 cm long, and the potato vine has begun to hang down from the ridge, commonly known as "Xialiangzi", which is elegantly known as "two ridges like holding hands instead of holding hands." At this time is the sweet potato branch tuber formation period, aboveground branches, underground tuber block formation, so it is very critical.
2. The second time to control prosperity: it is generally about 65-70 days after planting, when it is entering the "rainy season", with high temperature and humidity. It is the fastest growing season for sweet potato stems and leaves, and it is in the common period of sweet potato vines, but the tuber expands slowly, so it should be re-controlled at this time.
3. The third time to control prosperity: generally, about 85-90 days after planting, when the stem and leaf growth of sweet potato reaches its peak, it is necessary to prepare for the arrival of the second expansion period of sweet potato. In the second expansion period of sweet potato, the vine length is about 60-80 cm, and the ridge has basically been sealed. This is the golden period of sweet potato development, which should be re-controlled.
Second, how to control the prosperity of sweet potatoes?
1. For sweet potatoes with signs of vigorous growth, when the vine grows to about 35 cm, 20-30 grams of 5% uniconazole wettable powder and 30 kg of water can be sprayed once. Before sealing the ridge of sweet potato, spray it again when the vine is about 50 cm long, which can effectively control the prosperous growth of sweet potato.
2. It can also be sprayed with 15% paclobutrazol 100 grams per mu and 15 kg foliar spray with water when the sweet potato grows to the middle stage with a vine length of 50-70 cm. Generally, it can be sprayed every two weeks, even 2 to 3 times.
3. When the sweet potato seedling grows to 50-60 cm, it can spray 10 ml of thalidomide per mu or 20-25 ml of auxin per mu, which can control prosperity on the ground, help root growth, and increase production obviously.
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