Sweet potato control is to keep the sweet potato natural and strong. However, due to the influence of external factors such as excessive nitrogen fertilizer, excessive water and fertilizer, high temperature and rain, the sweet potato deviated from the normal growth orbit, and the growth became more and more prosperous, and there was even a phenomenon that “only long scorpions do not form potatoes”.

Sweet potato control, increase production and quality is the ultimate goal, in the eyes of many people, the control of sweet potato is the use of paclobutrazol, chlormequat, ketamine and other regulators to control stems and leaves no longer make it prosperous, in order to achieve control Wang's effect, and even increase the amount of medication, and ignore the real purpose of sweet potato control Wang----increasing production and upgrading.

Sweet potato control Wang wants to seize the key period:

The first time to control Wang:

In the first expansion period of sweet potato, the vine grows about 35-45 cm, and the potato vine has begun to hang down from the ridge, commonly known as "the lower beam", commonly known as "two ridges like holding hands and not holding hands." At this time, it is the branching and sweet potato period of sweet potato, the branching on the ground, and the formation of underground potato tubers.

The second control Wang:

Generally, it is about 65-70 days after planting. At this time, it is entering the "rainy season", high temperature and high humidity. It is the fastest growing season for sweet potato stems and leaves. It is in the long-term of potato vines, but the potato swells are slower.

The third time to control Wang:

Generally, it is about 85-90 days after planting. At this time, the growth of sweet potato stems and leaves reaches a peak. In order to prepare for the second expansion period of sweet potato, it is necessary to control it in time. In the second expansion period of sweet potato, the vine length is about 60-80 cm, which has basically closed the ridge. At this time, it is the golden period of sweet potato development, and it is important to control it.

Sweet potato control Wangtian field management technology

1. Management of rooting and slow seedling stage. The rooting stage of seedlings is formed from the growth of new roots to the roots of the roots, which lasts about 1 month. After the sweet potato is planted, it is necessary to check the seedlings and make up the seedlings in time to ensure the whole seedlings. After planting, if there is a drought, the seedlings should be poured in time to make the roots survive. Generally, after planting, it is necessary to pour water once, and then plough once every 10-15 days to loosen the soil, raise the temperature, eliminate the weeds, and promote the rapid growth of the plants to facilitate root formation.

2, branch and potato management stage, 30-40 days after planting with the increase of temperature, stem and leaf growth accelerated, roots continue to form expansion should strengthen water and fertilizer management in a timely manner, in case of drought can chase 5-8 pounds with water acres Urea, after pouring, it is necessary to cultivate the loose soil as soon as possible.

3, the management of the long and deep roots of the stems and leaves, 80 days after planting, the stems and leaves are swollen and the root area coefficient is the largest. Generally, in this period, it is necessary to promote the control. This period is in the rainy season, the temperature is high, and the plant grows fast. In order to prevent the length of the plant, 50PPM of paclobutrazol can be sprayed evenly in the field, and the leaf surface is covered with the liquid without flow, which can promote fruit development and make the sweet potato high quality and high yield. . In this period, the roots of the underground roots are rapidly inflated. In case of drought, watering is required, but the amount of water should not be too large. In order to promote the expansion of the potato tubers, one bag of inflated acre (12) grams and 15 kg of water are separated by 7-10 days. Spray once and spray twice.

4. Stem and leaf decline in the management of root enlargement stage, in the late growth stage of sweet potato, the stems and leaves grow slowly from slow to stagnant; the nutrient is transferred to the roots, the growth center is transferred from the ground to the underground, and the management should protect the stems and leaves to maintain normal physiological functions and promote rapid roots. Inflated. Management measures to ensure soil water content, 60-70% of the maximum water holding capacity in the field. If the weather is dry and rain-free, the soil is dry, which will cause the formation and accumulation of carbohydrates due to premature senescence of stems and leaves, resulting in reduced production. Water, but it is not suitable to water the sweet potato within 20 days before harvesting, so that the sweet potato skin aging is easy to harvest. If rainwater is drained in time, prevent hard and rot. In order to prevent premature aging, prolong and enhance the photosynthesis of leaves, promote the expansion of potato tubers, and carry out foliar spray fertilizer. The spray is sprayed with 30-40 kg of potassium dihydrogen phosphate and half a catty of water, and sprayed twice every 15 days. If combined with the use of bulking, the effect is better.

5, topping. When the main stem of the sweet potato grows to 50 cm, the top bud is removed in the morning when the weather is fine; the top bud is removed when the branch grows to 35 cm. This method can inhibit stems from growing, avoiding nutrient consumption, and promoting root enlargement, which can increase yield by 20% to 30%.

6, crack fertilizer. The sweet potato enters the root enlargement period, and cracks appear in the topsoil. At this time, use 750-1000 kg of clear water manure per acre, 500 g of potassium dihydrogen phosphate (also available with 5 kg of superphosphate, 50 kg of ash, and soaked in water), mixed in manure, and irrigated along the crack in the morning or evening. After application, the soil can be filled with cracks after irrigation, which can increase production by 20%~30%.

7, timely harvest

The roots of sweet potato are asexual vegetative bodies. There is no obvious maturity standard and harvest period. However, the harvesting of sweet potato has a close relationship with sweet potato yield, seed storage, storage, processing and utilization, and crop rotation. The sweet potato skin is aged and harvested.

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