What should we pay attention to when planting sweet potatoes?

What should we pay attention to when planting sweet potatoes? Please guide the sweet potato seed value with reference to the following techniques: first, select sandy soil with few weeds and light salinity in land selection and soil preparation, fine soil preparation in autumn, combined with 150 kg of straw per mu in autumn, 4000 kg of high-quality farm manure, timely ploughing in winter and spring to preserve soil moisture. 2. Raising seedlings 1. The hot Kang seedling method is used in the construction of the seedling bed. The area of the seedling bed is generally 6 square meters, and the size of the seedling bed can also be determined according to the amount of seedlings. The location must be in the location of shelter from the wind to the sun, the seedbed sits from north to south, leaving a fire pit door in the south and a chimney in the north, so as to heat the Kang and heat up. 2. Seed selection of sweet potato "868" with high yield and high quality in different places is selected as the mother seed. 2 square meters of seedling bed is needed in each mu of field, and 200 seed potatoes, about 50 kg, must be prepared. 3. Load sand and disinfect the prepared fine sand on top of the fire pit, with a thickness of 3-4 cm. Pour the sand thoroughly with boiling water for disinfection, and prepare to sow seeds after the sand cools. 4. Sowing around April 5, the selected seed potato is erected on the sandy soil on the bed surface, the sowing amount is 25 kg per square meter, and the sowing density is 100 seed potato per square meter. Then, the sand after disinfection and cooling with boiled water is covered on the seed potato, the sand soil should be 3 cm higher than the top of the seed potato, covered with agricultural film, and the agricultural film will be pressed on all sides to keep warm and wet. 5. Heating the fire pit on time to keep the temperature in the seedling bed under the film at 18 ℃ 25 min. 6. according to the degree of dryness and wetness of sandy soil, water should be sprinkled on the bed surface in time to ensure that the soil has enough moisture to facilitate seedling emergence and seedling growth. 7. According to the age and temperature of the seedlings, the temperature in the film should not exceed 25 ℃. Do not burn the seedlings, prevent overgrowth and cultivate strong seedlings. When planting, the leaf age is three leaves, the seedling height is 15 cm, and the seedlings can be picked 2-3 stubble. 3. Preparation before planting. 1. Applying pesticides in soil. Before ploughing underground pests, 200 milliliters per mu of phoxim and 15 kilograms of fine soil are evenly applied to the field, mainly to control land tigers, golden needles, grubs and so on. 2. when ploughing with basic fertilizer, 25 kg of diammonium per mu and 10 kg of potassium sulfate are applied per mu. If there is no autumn fertilization, 4000 kg of high-quality farm manure is applied in spring, 20 cm into the ground, and the rake is smooth. 3. Ridging ridge width 30 cm, ridge height 30 cm, furrow width 20 cm, ridge width and height should be uniform. 4. Planting 1. The planting time can be fixed from April 25 to May 25, and the most suitable time is May 5-15. 2. the planting method should be irrigated before planting, and the water depth should not exceed the top of the ridge. when the water seeps into the ditch surface for 2 / 3, it should be planted in the ditch with rain shoes. That is, after picking the nurtured seedlings manually, take the sweet potato seedlings in the left hand, bend 90 degrees in the right hand at about 5 cm, press down 3 cm deep from the top of the ridge, then cover the soil strictly with your fingers and irrigate the water again in 5-7 days. 3. Planting density: plant spacing 25Mel 30cm, row spacing 50cm, one seedling per hole, one row per ridge, 4500-5500 seedlings per mu. 5. Field management 1. Before ploughing, weeding and soil cultivation twice in time, and heighten and widen the ridge properly. 2. In the early flowering stage of topdressing irrigation, 30-40 kg ammonium bicarbonate was applied per mu according to the growth. The method is to apply it with a small shovel evenly at 5-7 cm from the seedling on both sides of the ridge, and then irrigate it. In the middle stage, it is appropriate to irrigate according to the dry and wet condition of the soil, and in the later stage, it is appropriate not to irrigate. 3. Foliar fertilization if the leaf color is yellowing, potassium dihydrogen phosphate should be sprayed in time, 100 grams per mu each time. 4. In order to prevent the vine from taking root, the vine should be pulled in time and should be plucked when the growth is too prosperous to promote the expansion of the tuber. 5. When diseases and insect pests are found, 100 grams of methyl topiramate or 100 grams of mancozeb are sprayed on 40 kg of water in time. Click to get more sweet potato planting techniques click to get more vegetable planting techniques