In the middle and late growth stages of sweet potato, it refers to the expansion from roots to harvest, also known as the expansion of tuberous roots. At this time, the growth of sweet potato stems and leaves is changed from strong to weak, the leaves are brown and fall off, and the nutrients are concentratedly transported to the roots. In management, we must continue to protect the stems and leaves. The normal physiological functions promote the rapid expansion of tuber roots, and specific measures should be taken to increase production.
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Applying crack fertilizers to crack cracking fertilizers can effectively prevent premature failure of stems and leaves and accelerate the expansion of tubers. Topdressing cracking fertilizer should be mainly potassium fertilizer and nitrogen fertilizer. Generally, in late August, 3% to 5% of potassium sulfate or 15% to 20% of ash leaching solution can be used, and 1% potassium dihydrogen phosphate solution can also be used. Application of ridge irrigation, 100-150 kg of fertilizer per acre. If drought can be combined with water soluble fertilizer. For late potatoes with premature decay, a mixture of 2% nitrogen, phosphorus and potassium can be used.
Drought-relief drainage is the autumn dry season from August to September. At this time, the stems and leaves of sweet potato shoots are in full bloom. If the soil is too dry, the expansion of the tubers will be blocked and deformed potatoes will be easily formed. The rough skin will reduce the economic value of the product. . Therefore, if there is no rain at 10 to 15 hours, irrigation or sprinkling should be performed promptly. In mountainous and hilly areas where water is difficult, water plants, straws and leaves can be laid beside the rows to facilitate drought protection. However, watering should not be carried out within 20 days before harvest so as not to reduce the storability of the tubers. In the event of Qiuyu, drain the water in time to prevent root rot.
It is one of the effective measures to increase the production of sweet potato by mentioning the vine leaves and protecting the vine leaves. The main method is not to turn vines, not to help the normal distribution of the leaves, the most effective use of light energy, is conducive to the normal operation and accumulation of nutrients, but also conducive to the protection of adventitious roots on plants, so that It can fix plants and has the ability to absorb water and fertilizer. In the late stage of sweet potato growth, hand-grown pods can be used for the low-lying land and the areas where the growth is prosperous, which can promote root enlargement without impairing the photosynthesis of the leaves.
During the late stage of growth of sweet potatoes, the roots have weak absorptive capacity. Applying foliar spray fertilizer is an important measure to ensure the effective supply of nutrients for tuber root swelling. The types of spray fertilizers may vary depending on the situation. Generally, hilly slopes or fields with premature decay should be sprayed with 0.5% urea; leaf vines with prosperous fields should be sprayed with 0.2% potassium sulfate and 5%. Plant ash leaching fluid; general field can be sprayed with 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture, each city spray fertilizer 75 to 100 kg. Spraying time is generally from the middle of the sun and the moon, spray every 7 to 10 days, a total of 2 or 3 sprays, spray fertilizer should be selected in the evening on sunny days, spraying the leaves to extend the function of leaves and promote the early maturing of potato Effect.