How to Grow Black Potatoes for High Returns? A Detailed Guide to Cultivation Techniques

I. Characteristics and Traits The seedlings are upright, the plant clump is lush, the plant type is tall, and the growth vigor is strong. Plant height is 60 cm, stem thickness is 1.37 cm, the stem is dark purple, and the cross-section is triangular. The main stem is well developed, with fewer branches. Leaf color is dark green, the petiole is purple, the corolla is purple, and the petals are dark purple. The tuber body is long oval, the skin is smooth, and it is black-purple, glossy black and shiny, and rich in luster. The tuber flesh is dark purple and tightly dense. The appearance color is highly attractive. Starch content is 13%-15%, and the taste is fragrant and mealy with good quality. The eyes are shallow, and the number of eyes is medium. Tuber set is concentrated, with 6-8 tubers per plant, and a single tuber weighs 120 g-300 g. The whole growth period is 90 days, and it is a medium-early maturing variety with strong drought and cold tolerance, wide adaptability, and tubers that store well. It is resistant to early blight, late blight, ring rot, blackleg, and viral diseases. The average yield is 2000 kg-2500 kg per mu, about 15% higher than ordinary varieties. It is suitable for cultivation in the main and secondary potato production areas nationwide, and its development prospects are promising.

II. Edible Value Black potatoes are rich in nutrition. Every 100 g contains 2.3 g protein, 0.1 g fat, 16.5 g carbohydrates, 11 mg calcium, 1.2 mg iron, 64 mg phosphorus, 342 mg potassium, 22.9 mg magnesium, 0.01 mg carotene, 0.1 mg thiamine, 0.03 mg riboflavin, 0.4 mg niacin, 16 mg ascorbic acid, and 100 mg anthocyanin. Black potatoes can be used both as a side dish and as a specialty dish. They can be stir-fried, deep-fried, braised, boiled, simmered, steamed, pan-fried, and so on, and can be made into 500 dishes with delicious flavors and different shapes and colors. In addition, they themselves contain abundant antioxidant substances, and after high-temperature frying they can still maintain their original natural color without adding pigments.

III. Cultivation Points 1. Sprouting and Cutting: 20-30 days before sowing, place the selected seed potatoes evenly under 20°C conditions, spray with an appropriate amount of water, and shade with straw mats. When the young sprouts grow to the size of soybean grains, place the seed potatoes in a warm, sunny place to sun the seeds, so that the seedlings turn green and the sprouts become strong. Cut the seed potatoes 1-2 days before sowing, with each seed piece weighing about 25 g. Small seed potatoes should be cut vertically, and each piece must have a strong top sprout; large seed potatoes should be cut starting from the tail, eliminating weak sprouts, and according to the arrangement order of the eyes, cut diagonally from the top, and finally split the top into two. The knife used for cutting must be strictly sterilized with 75% alcohol. 2. Land Preparation and Sowing: Black potatoes have a relatively short growth period and require concentrated fertilizer. Apply 3 cubic meters-5 cubic meters of high-quality organic fertilizer, 20 kg of diammonium phosphate, 20 kg of urea, and 10 kg of potassium sulfate per mu by broadcasting, then deep plow and fine harrow the soil after fertilizing. Black potatoes should be planted sparsely rather than densely. Open furrows at a row spacing of 70 cm and a furrow depth of 5 cm. When opening the furrows, apply phoxim granules to control cutworms and other underground pests. Sow at a plant spacing of 25 cm-30 cm, keeping about 3500 plants per mu. After sowing, press the soil in time and shape the ridges well, then spray herbicide and cover with plastic film. 3. Field Management: After the seedlings emerge, break the film in time to release the seedlings, and seal the seedling release holes tightly with wet soil. After the seedlings all emerge, in order to promote early vigorous growth of the seedlings, spray the leaves with 800-fold leaf green essence solution 2-3 times; during the flowering period, remove the flower buds in time. To increase the rate of large tubers, spray the leaves with 800-fold sweet fruit essence solution 2-3 times. The main disease of black potatoes is late blight, and the pests are aphids and ladybugs. To control late blight, spray with 64% antivirus alum 600-fold solution; to control aphids and ladybugs, spray with 18% chlorpyrifos 1000-fold solution. 4. Timely Harvest: Harvest at the appropriate time according to market supply and demand conditions, and during the harvest process, minimize mechanical damage as much as possible so as not to affect commercial quality.