How to control the growth of sweet potato leaves?

1) Suppressant.

In order to prevent growth, use a wang control agent before or just when sealing the ridge, uniconazole and mequat can be used, and the dosage should not be too large. It can be used in a small dose two or three times to control the growth of sweet potato stems, reduce nutrient consumption, and promote the expansion of tubers of the taproot.

2) Timan. Gently lift the sweet potato stems upwards to detach the lateral roots from the soil and prevent further growth. At the same time, it can also dry the ridge soil to improve the permeability of the soil.

It is not recommended to turn over the vines after rain, which is easy to damage the stems and leaves, disrupt the uniform distribution of stems and leaves, affect their photosynthetic efficiency, and reduce yield.

1. Topping: For the first time, when the main vine grows to 40 cm, remove the growth point of the main vine; The second time, when the branches are 30 cm long, remove the growth points of the branches. In this way, the branches are increased, the stems and leaves are lush, and the photosynthesis is enhanced, which shortens the distance between roots, stems, and leaves to transport nutrients, thereby promoting the expansion of tubers.

2. Mention vine: When the vine leaves appear to grow, lift them from the ground, and then place them in place, without twisting the stems and leaves, without disturbing the order of the vine leaves, and without breaking the vine leaves. This can inhibit the stem nodes from producing adventitious roots and vine leaves, and generally lift the vine once every 10-15 days.

3. Potassium spraying: After the vine leaves are sealed, 100 kg of water is sprayed with 500 grams of potassium dihydrogen phosphate per mu, sprayed once every 10 days, and sprayed twice in a row. It can also be 15-20 kg of plant ash to 50 kg of water, soaked for 24 hours to remove the slag and take the liquid, spray in the afternoon on a cloudy or sunny day, and apply 50-60 kg of leaching solution per mu.

In this way, the spraying of potassium can promote the activity of the root cambium layer and the synthesis and transport of carbohydrates, which can thicken the stems and leaves, thereby preventing the growth of vine leaves, which is conducive to the expansion of potato tubers.

1.Medication may be used. Pills like chlormequatin.

2.Manual seedling turning. Turn the sweet potato seedlings back and forth at intervals to prevent the sweet potato seedlings from taking root.

Turning sweet potato vine leaves artificially does not allow it to regenerate roots.

If the yellowing and wilting of sweet potato leaves is not very serious, you can cut off the yellow leaves one by one to maintain the permeability of the whole plant. If the yellowing is more serious, take maintenance measures in time.

Watering regularly, each watering to keep the potting soil moist, receive more sunlight every day, and keep warm in a low temperature environment.

It is also possible that sweet potato root rot is a disease.

The seedling emergence rate of infected potatoes is low and the seedlings emerge late, and black-brown lesions appear at the tip or middle of the absorbing roots, which are severe and constantly rotten, and the epidermis of the diseased part is longitudinally cracked and the subcutaneous tissue is present.

Darkened, the underground stem with light disease can send out new roots near the ground, although it can produce potatoes, but the tubers are small, and the rhizomes with heavy disease become black and rotten, causing the dwarf growth of the aboveground plants to be slow, the leaf color gradually turns yellow, and the whole plant dies.

Sweet potato root rot control measures.

1. Crop rotation stubble planting, for the plots with serious root rot all year round, the spraying of chemical agents has poor control effect, and it is necessary to rotate with other crops for more than 3 years to reduce the harm of root rot, such as corn, peanuts, sesame, sorghum and other crops in rotation.

2. There are differences in disease resistance between different varieties, and choosing varieties with strong disease resistance can not only prevent and control root rot, but also prevent other diseases, which is economical and effective. Deep ploughing of the soil and increasing the application of organic fertilizer can reduce the number of pathogens in the tillage layer and increase the disease resistance of sweet potatoes for the plots with serious root rot, so as to prevent and control root rot.

3. For the plots where root rot occurs, after the sweet potato is harvested, the diseased leaves, diseased plants and weeds that fall in the field should be cleaned out of the field in time to reduce the wintering places where the pathogens inhabit and reduce the number of pathogens in the field.

4. Before sowing sweet potatoes, use root boys to sterilize the seed potato pieces, which can effectively control the occurrence and spread of root rot. In the planting process, for the plants with initial root rot, the microbial agent of Trim is applied or irrigated, and the concentration of the agent is determined according to the severity of the root rot of the plant, so as to reduce the harm of the disease.

Want.

When the sweet potato seedlings grow vigorously, they should be controlled in time, otherwise the yield of sweet potatoes will be affected. When the sweet potato seedlings grow to 35-50 cm, the first indication of the growth control can prevent the growth of fibrous roots and control nutrient loss. When the sweet potato vine grows to 78 cm, the second control is carried out to promote the supply of nutrients, and the purpose of the control is to increase the yield.

Precautions for planting sweet potato seedlings.

After the sweet potato seedlings are planted, choose the special herbicide for sweet potatoes--- potato technology - prochlor, and a bottle of medicine five sprayers will hit one and a half acres of land, which can ensure that there are no weeds within 40-60 days. If no occlusive herbicide is used, and there are too many weeds in the middle and late stages, directional spraying such as a herbicide (paraquat) can be used to control the weeds.

The method is: first divide the two rows of potato seedlings in the ditch into another row, divide the next row into a row, and then spray the directional spray, and then spray the remaining seedlings in the ditch after spraying. Spraying must be done in windless weather.

Do not spray on the potato seedlings. If no closed herbicide is sprayed, a special potato technology sweet potato field Hekuo double removal post-seedling weeding agent should be used during the sweet potato growth period.

Pinch the sweet potato leaves casually, it doesn't matter, it doesn't affect the growth of sweet potatoes, as long as you don't pinch too much.

In the middle and late stages of sweet potato growth, pinching sweet potato leaves requires selecting the tender head of the sweet potato vine, so that the sweet potato vine can concentrate nutrients on the sweet potato and increase the yield of the sweet potato.

I think it needs to be subtracted, if not, it is very likely that the yield of sweet potatoes will not be so high.

Yes, this is very beneficial and very effective. It can promote ventilation and can promote the growth of plants.

Yes, it will have to subtract some to have a particularly good development, and there will be a particularly good harvest in the future, which looks like it will become a lot.