核桃的人工授粉与疏雄王家玉核桃树的开花授粉特性，一般有三种情况：１．雌雄异熟性，核桃是雌雄同株，单性花，通常在同一株树上表现出雌雄异熟性。有的雌花先熟，有的雄花先熟。由于雌雄花期不遇，熟性的差异，而制约传粉授精，影响产量的提高。２．核桃幼树在始花的最... Artificial pollination of walnut and flowering and pollination of Wangxiangyu walnut tree, there are three general conditions: 1. Androgyny, walnut is monoecious, unisexual flowers, usually in the same tree showed heterotrophic. Some female flowers first cooked, some male flowers first cooked. As the male and female florescence not met, the difference of maturity, which restricts pollination and insemination, affecting the yield increase. 2. Walnut saplings at the beginning of the flower ...