American Black Potato

American black potato is a new variety of black and red sweet potato introduced from the United States. The leaf heart is dirty, without engraving, short vine (70cm long 100cm), many branches in the basal part, the top three leaves purplish red. There are 6 tubers per plant, the single weight is 100kg 500g, the maximum is 1kg, the tuber is numerous and uniform, the yield per mu is about 4000kg for spring potato and 3000 kg for summer potato. Potato spindles, purple black black shell with purple skin, purple-red flesh, beautiful appearance, all purple-black after ripening, sweet flour sand, good taste and high nutritional value. Rich in anti-cancer substances selenium, iodine, per kilogram of fresh potato, protein 23g, sugar 290g, VA6.80 g, phosphorus 200mg, lysine, carotene, iron, zinc, calcium and other contents are higher than ordinary sweet potatoes, known as "green health food" in the United States.

Key points of cultivation techniques:

1 apply sufficient base fertilizer, deep ploughing Qilong applies high-quality soil miscellaneous fertilizer 4000 kg, ammonium bicarbonate 40 kg, calcium superphosphate 60 kg, potassium sulfate 20 thousand yuan per mu, deep ploughing more than 25 cm, ridge height 30 cm, upper 40 cm 50 cm wide, ridge bottom 90 cm wide, ditch bottom 30 cm wide, double rows on the canopy when planting seedlings.

(2) timely early planting of strong seedling sweet potato belongs to unlimited growth crops. Under suitable temperature conditions, the longer the growth period is, the higher the yield is. Plastic film mulching of spring potato can be planted 10 to 15 days in advance, and then break the film and release seedlings when there is no frost, which can increase the yield by more than 30% compared with non-film mulching cultivation. In open field cultivation, it is necessary to plant high-cut and strong seedlings with a height of about 25%. When planting, one row was planted on each side of the long surface, with 3,500 to 4,000 spring potatoes per mu and 4,000 to 5000 summer potatoes per mu. Under the condition of ensuring survival, cut as shallowly as possible. Leave 5 centimeters on the ground, all the rest are horizontally buried in the soil, buried at a depth of 50.8 percent, pour enough water, cover tightly with fine soil after the water seeps, and finally spray the surface with "diachlor" to prevent the harm of weeds.

(3) Scientific management about 5 days after planting, check seedlings and replenish seedlings, and water them along the ditch in case of drought in about 20 days. Pay attention to drainage in flood season. In the early stage of tuber, potassium sulfate compound fertilizer was applied once. After the rank vine was sealed, paclobutrazol was sprayed for 3 times to prevent overgrowth. It is strictly forbidden to turn rice seedlings. If they take root after rain, they can be lifted along the vine. In the middle and later stage of tuber, sweet potato expander and potassium dihydrogen phosphate were sprayed for 3 times to promote root expansion and increase yield. If there are pests harming the foliar surface, foliar fertilizer can be mixed with insecticides.