Extra-Root topdressing of Sweet Potato
In the growth and development of sweet potato, it can be divided into three types: weak seedling, strong seedling and strong seedling. Extra-root topdressing must be carried out according to different appearance in order to make the seedling vine strong and the potato block high yield.
For weak seedlings, urea 05~1KG, calcium superphosphate 1~1.5KG, methyl sulfate 0.5 ~ 0.75KG per mu, mixed solution spray and 50~7KG per mu can be used to promote root development and stem and leaf growth.
Strong seedlings focus on spraying potassium and phosphorus on this kind of potato seedlings. Generally, potassium sulfate 1KG, calcium superphosphate 1KG, water 50-75KG per mu are used to make leaching mixture spray, or 10-20% plant ash leaching solution is sprayed, 50-75KG per mu.
The main task of applying fertilizer outside the root of this kind of potato seedlings is to restrain the growth and make it from prosperous to strong. It can be sprayed with 0.1% sulfamethoxazole, 50-75kg per mu once in 7-10 days, a total of 2-3 times.
For sweet potatoes in the later growth stage, foliar fertilizer can be sprayed as appropriate in order to prevent early senescence and enhance vitality. If premature leaf yellowing of potato seedlings is found, 50-75kg of 1% urea can be sprayed; for those with normal growth, 0.3% potassium dihydrogen phosphate fertilizer solution can be sprayed 1-2 times, 50-75KG per mu.
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Diseases should be strictly prevented in the introduction of sweet potato
At present, the cultivation of sweet potato in our province is expanding to non-traditional planting areas, where the storage and conservation technology of sweet potato does not pass, and when it comes out of the cellar in spring, the seed potato supply can not be guaranteed, and some potato farmers have to introduce varieties from other places to increase the cost. Due to the introduction knowledge of potato farmers
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Several New methods of raising seedlings of Sweet Potato
The traditional sweet potato seedling raising technique is to store the sweet potato harvested in autumn, plant and cultivate potato vines in spring, and then cut the vines into rattan segments to breed sweet potato seedlings. This method is labor-consuming, time-consuming and seed-consuming, and the storage technology in winter is not easy to master, affecting the following year.
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