一、前言用桑种子繁殖的实生苗,根多根深,适应性强,但是叶小,性状各異,产叶量低。所以,生产上一般都用丰产优質的品种进行嫁接,成为嫁接桑苗。桑苗的嫁接方法很多,以袋接法最为普遍。袋接法又分广接、火培接、普通接三种。育成时间前两者需要二年,后一种需要三年。目前主要提倡广接法,好处是成苗时間短,成活率高,苗木質量好,栽植后生长旺盛,产量高等。但是,过去一株实生苗只能接一株嫁接苗,剪下的实生苗条不加利用。在目前蚕桑生产大发展的形势下,砧木不足,就会影响发展速度。有人做过“一苗二接法”的試驗,可能由于嫁接技术和管理问题,成活率表現不高,成苗質量不理想,沒有得到推广。为了充分利用砧木,我們于1963年开始进行一株实生苗二接法的試驗,証明以同数的实生苗可以多繁殖嫁接苗80%以上,方法簡单易行,是成活率高的一种繁殖方法。近 First, the introduction of seedlings with mulberry seedlings multiply, deep roots, adaptability, but the leaves are small, different traits, low leaf yield. Therefore, the production is generally used in high yield varieties of high quality grafting, become grafted saplings. Sang Miao many grafting methods, the most common way to bag. Bag connected method is divided widely, fire pei then ordinary three. It takes two years before the birthing time, which takes three years. At present, the main advocate wide access method, the benefits are short time seedlings, high survival rate, good seedling quality, vigorous growth after planting, high yield. However, in the past only one seedling grafted seedlings, cut the bare slender useless. In the current situation of great development of silkworm mulberry production, lack of rootstocks will affect the pace of development. Some people have done “a Miao two access” test, probably due to grafting technology and management issues, the survival rate is not high, the quality of the seedlings is not ideal, has not been promoted. In order to make full use of rootstocks, we started a second seedling experiment in 1963 to prove that the same number of seedlings can propagate more than 80% of the grafted seedlings, the method is simple and easy, and is a kind of breeding with high survival rate method. near