“双早”是以“云新7926”为母本,四川乡土核桃“夏早”为父本杂交育成的早实核桃新品种,2010年2月通过四川省林木品种审定委员会认定。坚果近圆形,外观黄白色,腹径3.44cm,缝径3.41cm,纵径4.07cm。壳面刻点浅,果顶略尖,果基平,缝合线微凸,果壳密合。单果重约11.3g,壳厚约0.69mm。极易取整仁,内隔膜退化为膜质,出仁率55.4%左右。核仁粗脂肪含量68.84%,蛋白质20.74%。树势中庸偏强,树形自然开心形。4年生树高2.8m,冠幅10.46m2,干高约0.5m。定植1年后开花 “Double early ” is a new early-maturity walnut variety with “Yunxin 7926” as its female parent and Sichuan native walnut “Xiazao” as the male parent. In February 2010, it was approved by the Sichuan Provincial Forest Variety Committee finds. Nearly circular nuts, the appearance of yellow-white, abdominal diameter 3.44cm, 3.41cm slit diameter, longitudinal diameter 4.07cm. Shell surface point light, slightly apical fruit, fruit-based flat, suture convex, shell close. Single fruit weighs about 11.3g, shell thickness of about 0.69mm. Very easy to take whole kernel, the inner membrane degeneration into membranous, kernel rate of about 55.4%. Nucleolus crude fat content of 68.84%, protein 20.74%. Moderate strong middle-class tree, tree-shaped natural happy shape. 4-year-old tree height 2.8m, crown width 10.46m2, stem height of about 0.5m. One year after planting flowering