High-yield planting techniques of sweet potato: how to apply fertilizer is reasonable?

Sweet potato, also known as sweet potato, sweet potato, is one of the common crops in our life. Sweet potato is a kind of green and healthy food, which contains a lot of protein, sugar, fat and various vitamins and minerals. Eating sweet potatoes often can not only smooth intestines and defecate, but also strengthen stomach and replenish qi. Sweet potato is known as "longevity food". With the increasing demand for sweet potato, it is widely cultivated by many farmers. High-yield planting techniques of sweet potato: how to apply fertilizer is reasonable?

First, sweet potato high-yield planting techniques: how to apply fertilizer is reasonable?

1. Look at the situation of the seedlings

In the period of branching and tuber formation, the underground root net is formed, the tuber begins to expand and the fertilizer absorption is strong, at this time the leaf area of potato increases and the photosynthetic efficiency increases, so it is necessary to topdressing as soon as possible in order to achieve the goal of strong plant, fast and stable growth. For those with good growth, the amount of fertilizer can be reduced. If the amount of nitrogen applied to seedlings or tuber fertilizer is large, potato fertilizer can only be applied potash fertilizer, and potassium sulfate can be applied about 10 kg per mu.

2. Look at the time

Potato fertilizer is generally applied about 45 days after planting, at this time the aboveground part has been thrown under the ridge, the potato block has been basically shaped, on one side of the ridge, use a plow to break 1 stick 3, and then apply fertilizer. Ridge-breaking fertilization can improve the aeration condition of the soil and is beneficial to the expansion of potato lumps. This fertilization is mainly potash fertilizer, topdressing potash fertilizer can thicken the stem and petiole, keep it young, and promote the expansion of potato lumps.

3. Look at the soil quality

Sandy soil, good ventilation, but poor fertilizer and water conservation, fertilizer effect is not lasting, and easy to lose, it is necessary to increase the application of organic fertilizer to improve the soil, a small amount of quick-acting fertilizer should be applied, and the number of topdressing should be increased appropriately. Clayey soil, due to poor air permeability, slow fertilizer decomposition, but strong fertility, so the amount of topdressing should not be too small, can be appropriate more topdressing, appropriately reduce the number of topdressing.

4. Look at the moisture

An important principle of sweet potato fertilization is that the amount of nitrogen fertilizer should be controlled under the condition of good water, so as not to cause excessive growth of stems and leaves. In high temperature and arid areas from July to August, sufficient nitrogen fertilizer should be applied before drought to promote stems and leaves to seal ridges before drought. In years with more autumn rain, the number and frequency of topdressing can be appropriately reduced, otherwise it should be appropriately increased.

Sweet potato can not apply fertilizer containing chlorine, it will reduce the starch content of potato, but also make the potato not resistant to storage.

Second, how to reduce the pest of sweet potato?

1. Rotation of healthy potato seedlings

According to the main disease and pest control objects, good disease-resistant (tolerant) varieties were selected according to local conditions, disease-free seed land was established, and healthy seedlings were planted, combined with winter tillage to pick up insects and frozen ridges. In order to implement crop rotation, it should be planted on the stubble land where sweet potatoes have not been planted in 3 years.

2. Clean fertilizer and clean water, strict management

Do not apply fertilizer made from rotten sweet potato and stem vine, but apply chemical fertilizer timely and appropriately. Cut off the source of bacteria, strictly apply clean fertilizer, plant clean seedlings, irrigate clean water, prevent underground pests and prevent the spread of bacteria. In the potato block out of the cellar, seedling, planting, harvest and other links, thoroughly pick up the sick and disabled bodies, effectively focus on deep burial or burning, do not give germs a chance to survive.