引进美国核桃良种简介１９８５年以来，我所相继从美国引进许多核桃品种，有的经多点高接试栽，从中选出几个适应性强，丰产的优良品种。无论在核桃育种上，还是在生产上，若推广和应用这些良种，必将推动我国核桃事业和发展。１契可（Ｃｈｉｃｏ），是用夏凯（Ｓｈａｒｋ... Introduction of Walnut Varieties in the United States Since 1985, we have introduced many varieties of walnuts successively from the United States, and some have picked up a large number of varieties with high adaptability and high yield. Whether in the breeding of walnuts, or in the production, if the promotion and application of these varieties, will promote the cause and development of China’s walnut. 1 Chico, is the use of Xia Kai (Shark ...