Key Cultivation Techniques for Purple Sweet Potatoes
The key cultivation techniques for purple sweet potatoes are provided by Jindian Agricultural Purple Sweet Potato Planting Base:
Purple sweet potato varieties contain not only starch, protein, and fat, but also abundant Vitamin A, Vitamin B2, carotene, Vitamin C, anthocyanins, chlorogenic acid, as well as calcium, phosphorus, iron, and other minerals, along with a certain amount of fiber. Purple sweet potatoes are rich in selenium elements and have strong antioxidant effects. The anthocyanins and chlorogenic acid in purple sweet potatoes can inhibit the production of carcinogenic substances and reduce gene mutations. They can also lower the transaminase level in serum and have good preventive effects on hypertension and other cardiovascular diseases. Purple sweet potatoes also contain mucoprotein, which has anti-cancer properties. Therefore, purple sweet potatoes are characterized by high nutritional value and strong health benefits.
Purple sweet potato leaves and top leaves are all green, the stem is green with a hint of purple, and the vine length is moderate, with strong plant growth momentum. The tubers have good sprouting ability, produce a large number of seedlings, have robust vines, purple-red skin, and purple flesh. The tuber shape is uniform and attractive, resulting in a high commercial rate, good adaptability, and suitable for cultivation in various regions across the country.
Cultivation Techniques for Purple Sweet Potatoes:
1. Selection of Seedlings:
Choose healthy and disease-free vine heads with a length of about 15 centimeters.
2. Land Selection:
Sandy loam soil is preferred. Clayey, waterlogged, or sticky soils are unsuitable. The ideal plowing depth is around 30 centimeters.
3. Fertilizers:
The principle is to primarily use phosphorus and potassium fertilizers with nitrogen fertilizer as a supplement. It is recommended to apply 1000-2000 kilograms of organic manure per mu (Chinese acre), 100 kilograms of organic compound fertilizer (containing soybean meal and other organic fertilizers), and 5-10 kilograms of potassium sulfate. These should be concentratedly applied when building ridges, effectively preventing underground pests.
4. Planting Specifications:
Before planting, build single ridges with a ridge spacing of 80 centimeters and a ridge height of 20-30 centimeters. The plant distance depends on the soil quality; mountain sandy loam soil should plant around 2800-3000 plants per mu with a plant distance of 28-30 centimeters, while flat slope loam soil should plant around 2500-2800 plants per mu with a plant distance of 30-33 centimeters.
5. Sowing Period:
Spring sweet potatoes are best planted from late April to late May, while summer sweet potatoes (vine melons) can be delayed until mid-July. Early planting should be done appropriately in each region, which could lead to varying degrees of increased yield.
6. Weed Control:
To save labor and improve weed control effectiveness, after planting sweet potatoes, herbicides such as ethalfluralin can be sprayed. Use 150 milliliters of medicine per mu, diluted with 75 kilograms of water, and evenly spray it while trying to avoid young seedlings.
7. Planting Method:
Vertical insertion method, where the seedling is deeply inserted vertically into the ground with the tip exposed 2-3 centimeters above the surface. This method results in fewer tubers per plant but larger tubers with higher finished product rates. As the old saying goes, "deep planting ensures survival, shallow planting ensures tubers." During planting, ensure large pits, sufficient watering (water solution containing avermectin), extended water consumption time, and strictly sealed pits.
Field Management:
1. From planting to before sealing the ridges is the early growth period. The main focus during this period is to promote growth. If conditions allow, a 0.3% potassium dihydrogen phosphate water solution can be sprayed during the seedling recovery period. In cases of severe spring drought, if irrigation conditions are available, timely watering can be done from late May to early June. Watering should be done slowly with fine water, ensuring that the water does not exceed half the ditch to prevent excessive water causing soil compaction and significant drops in ground temperature. If cutworms are present, avermectin-based pesticides can be sprayed for prevention.
2. From sealing the ridges to before the vines return is the middle stage. For high-yield fields, the main focus should be on controlling stem and leaf overgrowth to promote rapid root expansion. For general fields, both stem and leaf growth and root expansion need to be promoted. Field management should include timely flood prevention. If there is a possibility of excessive stem and leaf growth, the vines should be lifted promptly to prevent overgrowth. When the vines reach one meter in length, an appropriate amount of ethalfluralin solution can be sprayed. For fields without excessive growth, protect the stems and leaves without flipping the vines.
3. This refers to the period from the vines returning to harvest. The main management during this period is to prevent early decay of stems and leaves, extend the lifespan of leaves, maintain an appropriate leaf area, increase the photosynthetic efficiency of leaves, and promote the transfer and accumulation of nutrients from stems and leaves to the roots. Main measures include foliar fertilization: if the leaves turn yellow quickly, a 0.3% urea water solution can be sprayed; if the ground growth is vigorous, a 0.3% potassium dihydrogen phosphate water solution can be sprayed. After August, if the weather is dry, water should be applied appropriately. In case of flooding, timely drainage is necessary.
Jindian Agricultural Company's Purple Sweet Potato Planting Base offers wholesale purple sweet potatoes, purple sweet potato seeds, and seedlings. Free purple sweet potato planting technique DVDs are provided with the purchase of seeds. Contact number: 15080987576
For more details, please visit the company website: http://www.jindinongye.com