Purple sweet potato variety: purple sweet potato

Purple potato, also known as black potato, English name Purple Potato, potato meat is purple to dark purple. In addition to the nutrients of ordinary sweet potatoes, it is also rich in selenium and anthocyanins. In recent years, purple potato is very popular in the international and domestic market, and its development prospect is very broad.

Purple potato

Nowadays, many purple sweet potato varieties have been bred in various countries. At present, the purple sweet potato varieties cultivated in various parts of our country are as follows:

① mountains and rivers purple. Introduced from Japan, this variety has high pigment content, which is more than 2 times higher than that of common purple sweet potato. It can also be used to extract pigment. The output of 667 square meters is generally more than 1500 kilograms, the potato shape is slender, the uniformity is poor, and the length of the main vine is 6 ~ 7 meters. Cooking with the tender stems and leaves (tips) of the potato tastes better than hollow vegetables.

② American sweet potato. The variety was bred in the United States. The taste is delicate, sweet and smooth, with rich aroma. This potato has strong sprouting, many branches, sturdy, up to 1 meter long, not prosperous and semi-erect. The general output of 667 square meters is 3000 kg, which is rich in nutrition. Lysine, manganese, potassium, zinc and other trace elements, as well as iodine and selenium with anticancer effect, are higher than those of American black sweet potato. It can also be used to extract pigment.

③ German sweet potato. Introduced into China in 2002, medium vine, many branches, neat potato size, delicate meat, sweet and delicious, strong disease resistance, generally 667m2 yield 4000 kg ~ 5000 kg, single plant tuber can reach more than 10kg, the maximum single potato weight 5.7kg. In addition to edible, pigment can also be extracted, which is one of the best varieties of purple sweet potato.

The purple sweet potato varieties that have been bred in China are as follows:

① Jishu 18. The variety was bred by crop Research Institute of Shandong Academy of Agricultural Sciences, with an output of more than 3000 kg per square meter.

② Guangshu 135. The variety was bred by Guangdong Academy of Agricultural Sciences with a yield of 2000 kg ~ 2500 kg per square meter.

③ Ningzi No. 4. The variety was bred by the Grain and Oil crop Research Institute of Jiangsu Academy of Agricultural Sciences, with a yield of about 500 kg per 667 square meters. The above three varieties can also be eaten fresh, and they all have the characteristics of drought resistance, barren tolerance, strong adaptability, high yield, uniform potato pieces, smooth potato skin, bright color and delicate meat, so they are suitable for planting in sweet potato producing areas. ④ Jingshu 6. This variety is made from the cross between Brazilian sweet potato and Chinese sweet potato with long stem, purple skin and meat, high sweetness and good quality. the yield of 667 square meters is 1500 kg ~ 2000 kg and the drying rate is high. It is mainly used for deep processing and pigment extraction.

The deep processing of purple potato is mainly the extraction of anthocyanins. Anthocyanin is a natural purple pigment additive, which is safe and has no side effects. although it is more expensive than synthetic pigment, it still sells well in the international market. Purple sweet potato can also be peeled, dried and crushed into full powder, beautiful color, rich nutrition, is an excellent raw material for food processing, can be used as a variety of pastry ingredients and ingredients. At present, South Korea imports about 500 tons of purple sweet potato flour from China every year. In addition, potato chips, frozen potato cakes and vermicelli made from purple sweet potatoes are favored by the market for their rich nutrition and good taste.

The cultivation method of purple sweet potato is basically the same as that of ordinary sweet potato.