What is the storage method for planting sweet potatoes before and after Cold Dew?

As the saying goes, "leaving a seed of sweet potato is afraid of freezing injury." how to store the preserved sweet potato is a problem, so what is the storage method of Cold Dew before and after leaving a seed of sweet potato?

1. Selected plots for melon planting

Sweet potato species should be selected on the plots with high dry terrain, loose soil, deep plough layer, excellent drainage and ridge cultivation. Because of the good soil conditions, the sweet potato has strong growth, disease resistance and storage resistance. The stem of sweet potato for planting should be short, the melon should be gathered, and the type of melon should be in accordance with the typical characteristics of the original species. The skin is dark, the appearance is lubricated, and the water content is not too much; the weight of melon is between 150 grams and 200 grams. There are many seedlings in such melons, the seedlings are full and strong.

Second, plant selection and seed retention in the field

In the field where there is no disease and light turbidity, usually when the round tree shakes the vine, the single plant with the characteristics of this species, strong growth and no disease spot is visually selected, the symbol is inserted, and the plant is harvested at harvest. Usually according to the cultivated area, not less than 200 plants per mu are selected.

Third, harvest should be ordered.

Choose a sunny and warm climate to harvest before severe frost, otherwise it will reduce the disease resistance and storage ability of sweet potato species. Sweet potato is a temperature-loving crop. Sweet potato seeds reserved for storage should be harvested when the soil temperature is 5 cm and stable at 10 degrees. In particular, the temperature changes greatly in September and October, and it is necessary to start harvesting according to climate changes in order to avoid freezing damage to sweet potato species. Dig deeply, sort carefully, put lightly during harvest, avoid digging and throwing, etc. After loading the basket and mailing it, it needs to be light, light and light. Go straight to the cellar for storage. Try to reduce the chance of bumping melon pieces. The best choice is to harvest in the morning, bask in the field, and enter the cellar in the afternoon to prevent frost damage.

Fourth, do a good job in safe storage

1. Sweet potato seeds must be stored separately from edible sweet potatoes and potatoes, so as to avoid eating sweet potato and potato diseases to infect sweet potato seeds. it can also deal with the hostility in which potato seeds are satisfied with potato temperature pleading and sweet potato seeds suffer frost injury or potato heat injury during storage.

2. The local environment for storing and keeping sweet potato seeds should be clean and boring, so we should choose to dig the ground and melon seed cellar in the local area with high terrain and shelter from the wind and sun. If the old cellar is used, the old soil should be scraped off, the new soil should be exposed, or the thick lime water should be sprayed, or sulfur fumigation should be used for disinfection, so as to avoid the epidemic disease after the sweet potato is planted in the cellar. The bottom of the pit should be covered with dry sand and hay should be placed nearby to prevent melon seeds from getting wet.

3. It is necessary to make strict and careful selection of sweet potato species before entering the cellar, because sweet potatoes are often decayed by black spot and soft rot during storage. Therefore, it is necessary to select seed potatoes that have no damage, no freezing, no rotten top, and no diseases and insect pests. Together plead sweet potato seed color is right, the size is moderate, has this kind of typicality.

4, the first time into the cellar with the melon seed respiration is very strong, release a lot of heat, melon seeds stacked together, the heat is very slow, can open the cellar door, proper ventilation. When the pit temperature drops to 12 degrees, close the pit door. Pit door temperature should be between 11 and 15 degrees, not lower than 11 degrees, higher than 18 degrees, to prevent freezing or sprouting. It is necessary to pick out sick and rotten melons at any time.