核桃具有较高的经济价值和营养价值,是我国食油生产的第二条战线,它在世界干果栽培中居于首位。美、法等国核桃平均亩产一般为150多公斤,较我国高几倍到十几倍,主要是因为我国核桃生产基本上沿用种子繁殖,至今仍停留在放任生长和半栽培状态,没有实观良种化、品种化。针对存在问题,自1990年开始我省进行了核桃选优工 Walnut has a high economic value and nutritional value, is the second front line of China’s cooking oil production, which ranks first in the world’s dried fruit cultivation. The average yield of walnuts in the United States, France and other countries is generally over 150 kilograms, which is several times to ten times that of our country, mainly due to the fact that the production of walnuts in our country basically follows the seed breeding and still stays in the state of letting growth and semi-cultivation till now. View good variety, variety. For the existing problems, since 1990, our province has carried out walnut excellent selection