The special regional characteristics determine the excellent quality of Xuanhua milk grapes. Xuanhua District is located in the northern margin from the intermountain basin to Xuanhua basin in northwest Hebei, with 40 31'north latitude and115 2' east longitude. Xuanhua Basin is a typical Cenozoic intermountain valley fault basin, which is distributed from northwest to southeast, with the Yanghe River flowing from west to southeast in the center, surrounded by mountains, and Niangniang Mountain and Huanghuang Mountain in the south. The highest elevation of Tongyan Mountain is1023.2m, and the lowest elevation of Yanghe Mountain is 59 1 m.. The terrain is high in the northeast and low in the southwest, and gradually inclines. The areas of plains, rivers, mountains and hills are equally divided. There are abundant underground water sources and good irrigation conditions. The PH value of soil is 8-8.5, mostly light alluvial calcareous soil and sandy alluvial calcareous soil. Rich in calcium carbonate and rich in calcium and potassium, it is extremely beneficial to the transformation of glucose content, promoting root development, improving the assimilation rate of leaves, and making Xuanhua milk grape not only have good quality, but also significantly increase the sugar content, and the pulp is crisp and juicy.
Superior climatic conditions ensure the quality of Xuanhua milk grapes. Xuanhua belongs to the continental temperate monsoon climate zone in East Asia, with cool summer, cold winter and windy spring. The annual average sunshine hours are 2906.4 hours, with a maximum of 3047.6 hours and a minimum of 26 12.6 hours; The annual average temperature is 8℃, 65438+ 10, the coldest in October is -20.9℃, the hottest in July is 24℃, and the absolute highest temperature is 39. 1℃. The average annual rainfall is about 400 mm, the highest is about 560 mm and the lowest is about 240 mm; The annual average frost-free period is 1.39 days, and the latest frost-free period is in the middle and late May. Therefore, dry air, less rainfall, good atmospheric transparency and abundant light energy resources are beneficial to the growth and quality improvement of grapes.
Abundant natural resources gave birth to the unique quality of Xuanhua milk grape. Xuanhua's unique landform features four distinct seasons, abundant sunshine, short frost-free period, relatively concentrated illumination time, generally low rainfall and large temperature difference between day and night, which gave birth to the unique qualities of Xuanhua milk grape, such as large grain, thin skin, thick meat, sweet taste, good quality and moderate sweet-sour ratio.
Xuanhua milk grape is mainly cultivated in courtyard style, which is rare in the world with a unique funnel frame style. It is the cultural heritage left by our ancestors and has profound cultural connotations. At the same time, the funnel frame is easy to prevent wind and sand, the grape illumination is more uniform, and it is easier to condense water and fertilizer.