First, spray grass ash: grass ash is sweet potato favorite potash fertilizer, if sprayed on the sweet potato leaf ash, can generally increase production by 15%, and good quality. The specific method is: After sweet potato leaves ridge, with 15-20 kg of grass ash 50 kg water soak, 24 hours after the slag filter to take liquid, selected sunny afternoon or cloudy day sprayed on the sweet potato leaf surface, Mu Shi Baptist Liquid 50-60 kg, the effect is good.
Second, spray titanium: Titanium on the growth and development of sweet potato has a significant role in promoting. The main results are that the number of sweet potato per plant, the number of branches, the ratio of thick potato and large potato were 0.7, 1, 0.3, and 4.3% higher than that of the non-titanate. It also accelerated the process of dry matter accumulation of sweet potato, and increased its dry cutting rate by 0.5% compared with that without titanium, and increased production by more than 14%. In the period of sweet potato plantation, it is appropriate to use 30 grams per acre. If this value limit is exceeded, the yield increase benefit will drop significantly. If it rains within 24 hours after spraying, it should be sprayed once, but the dose of the spray should be reduced to 10-20 grams per mu as appropriate.
Third, the control of leggy: sweet potatoes in early growth should pay attention to the top, in the middle and late to control the amount of nitrogen fertilizer, cut off the roots around the tuber, put vines to pull off the adventitious root, spraying paclobutrazol and other measures to inhibit the stem and leaf length. Under normal circumstances, use 15% paclobutrazol 75-80 grams per acre, 50 kg of water, spraying the leaf surface once in the group stage and in the ridge period, you can control the sweet potato leggy.
Fourth, to promote vine (秧): the number of sweet potato turning rake, the more severe the reduction, so to protect the stems and leaves of sweet potato, the method can be used to prevent vines to prevent excessive running roots, ban vines (秧). After the sweet potato is ridged, if the land is fertile and the stems and leaves grow too profusely, the vines can be gently brought back to their original position (combined weeding). The time for lifting the vines should be before the end of August and a total of 2-3 vines are recommended.
Fifth, remove the top of the heart: picking the top heart can regulate the operation of nutrients to promote nutrient delivery to sweet potato roots. Picking the heads for a total of 2 times, each time when the cranberry grows to 30-33 centimeters in length, remove the 1-2 centimeter long head, and when the second branch grows to 30 centimeters or longer, remove the points. The branch is tender and sharp.
6. Branch removal: In July, more than 20% of the branches of the sweet potato field with more prosperous branches could be cut with scissors. This will allow nutrients to flow back and allow the tubers to get more nutrients, improve the light transmission between the shoots, and speed up photosynthesis. However, it should be noted that barren soil should not be topping. Collecting leaves directly leads to a reduction in the yield of sweet potatoes, and the earlier harvesting leaves, the heavier the yield reduction.
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