In view of the short growing season of summer sweet potato, the shortage of farm work and the shortage of seedling source, the following supporting technical measures should be highlighted:
(1) Early planting with early frost is an important measure to strive for the early growth of summer sweet potato leaves, and to make full use of the heat and light energy resources in the high temperature period to achieve high yield. Each day of planting, the effective accumulated temperature can be increased by more than 10 °C, and the effective temperature per degree can increase about 45 kg of fresh potatoes per hectare. On June 20th, 29902.5 kg of fresh potatoes per hectare were planted; on June 30, 26,508 kg of fresh potatoes per hectare were produced. The average daily increase of fresh potatoes is 339.5 kg. Strive for early planting to manage the seedlings, prepare the seedlings, and cut the ridges and ridges.
(2) Using the experiment of increasing fertilizer and promoting rapid growth, each additional 500 kg of soil manure can produce 150-200 kg of fresh potato; each additional application of 1 kg of standard nitrogen fertilizer can increase the yield of fresh potato 10--15 kg. Each additional 1 kg of grass ash can increase the yield of fresh potatoes by 2 kg. Fertilization should be carried out in deep ditch and concentrated application. Except for the base fertilizer, the other fertilizers (including nitrogen, phosphorus and potassium) should be ditched 6.7--10 cm deep and concentrated.
(3) Promoting early seedlings by strong seedlings According to the experiment, the potato seedlings increased the yield of fresh potatoes by 4,500-6000 kg per hectare, and increased yield by 18.2%--24.6%. Therefore, the realization of potato vines in summer sweet potato is an important guarantee for the high yield of summer sweet potato. At the same time, it is necessary to improve the quality of planting and ensure that the top leaves are not dry. When planting, in addition to choosing a fully robust vine head and accompanying the insertion, it is necessary to deepen the slanting plant back to the soil, enlarge the nest, water more, seal the nest and make the leaf stalk provoke the ground, and ensure that the planting After the early morning and long hair, early potato.
(4) Taking scientific management to win high yields First, we must adhere to deep ridges and ditch, ridges and ridges, and ridges and ridges. It can also be used for pulling or ploughing, ridges and ridges. Shallow. Do not damage the ridge without hurting the roots, and spray the herbicide to cover the wheat stalks, which is more conducive to the growth of sweet potato. The second is to do a good job. When burrowing, we must dig the lower ditch, intercepting ditch and potato ditch, so as to ensure the "three ditch" to ensure the timely removal of stagnant water after the rain. Third, water must be watered during the drought. Generally, it is watered twice, which increases the yield of fresh potatoes by 37,500-6,000 kilograms per hectare, an increase of 21%-38%.
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