The legend of sweet potato

1593, that is, during the Wanli period of the Ming Dynasty in China, Chen Zhenlong, a businessman from Fuzhou, Fujian, took his son Chen Jinglun and his caravan across the ocean to the Philippines. There, they saw sweet potatoes everywhere, ate for half their lives, and ate sweet potatoes for the first time.

Sweet potato's unique sweet aroma and satisfying satiety immediately attracted them. After inquiring, they learned that sweet potato is drought-resistant, barren-resistant, easy to transplant, easy to reproduce, rich in nutrition, sweet in taste and high in yield, and they were immediately tempted.

At that time, the invading army and the famous Li fought fiercely in Pyongyang. People are suffering from natural and man-made disasters, food shortage and misery. Now they have decided to bring sweet potatoes back to their hometown for planting.

At that time, the Spanish colonists made a very strict ban on foreign sales. In the face of strict inspections at various ports, Chen Zhenlong and his son came up with a coup, weaving a sweet potato vine into a cable, avoiding the checkpoints of Spanish colonists and successfully boarding a merchant ship returning to their hometown in Fujian.

After seven days and seven nights' voyage, I brought the secret of sweet potato to China, and sent a letter to Fujian Governor Jin at that time, requesting to promote planting.

Extended data

Growth habit of sweet potato: sweet potato likes temperature, is afraid of cold and is not cold-resistant. The suitable growth temperature is 22-30℃, and the growth will stop when it is lower than 65438 05℃. Different growth stages have different requirements on temperature, and the temperature in bud stage should be 18-22℃. Too high or too low temperature will affect the germination rate.

The seedling temperature should be 22-25℃, the stem and leaf temperature should be 22-30℃, and the stem and leaf temperature should not be lower than 16℃, otherwise it will hinder its growth or even stop its growth; If it is lower than 8℃, it will cause plants to wither and die of frost. The temperature of root tuber stage should be 22-25℃. Appropriate temperature can promote the growth of plants in each growth period and ensure the rapid number and expansion of roots.

Morphological characteristics of sweet potato: panicum miliaceum, with round, oval or spindle-shaped roots in the underground part. The shape, skin color and flesh color of tuberous roots vary with varieties or soils. Stems procumbent or ascending, occasionally twining, multi-branched, cylindrical or angular, green or purple, sparsely pilose or hairless, and stems are prone to adventitious roots.

The shape and color of leaves are often different for different varieties, and sometimes there are different leaf shapes on the same plant. They are usually broadly ovoid, 4-13cm long and 3-13cm wide, and all leaves or 3-5(-7) lobes are broadly ovoid, triangular ovoid or linear-lanceolate.

The leaves are heart-shaped or nearly truncated at the base, tapering at the top, sparse or nearly hairless on both sides, and the leaves are dark green, yellow-green, purple-green and so on. The color of the top leaf is one of the characteristics of the variety; Petioles vary in length, 2.5-20 cm long, sparse or glabrous.