文冠果是一种抗寒耐旱的木本油料树种,种子含油率30%,是我省主要的木本油料树种之一。但由于长期的自然杂交,个体间的长势及种子产量差异很大。为提高单位面积产量,近几年来,我们除了用优树种子进行繁殖外,还采用嫁接方法改劣为优,现将高接换头法,简介如下: 1974年4月中旬,选取14年生低产文冠果树作砧木,选优树的1年生有顶芽的结果枝作接穗,条长10-15厘米,粗0.5厘米以上,用 Xanthoceras sorbifolia is a cold-resistant woody oilseed species, seed oil content of 30%, is one of the main woody oilseed species in our province. However, due to long-term natural hybridization, there is a big difference between the growth of individuals and the yield of seeds. In order to increase yield per unit area, in recent years, we not only breed superior tree seeds, but also adopt the method of grafting to make worse. Now, the method of high interchange heads is introduced as follows: In mid-April 1974, 14-year-old low yield Xuan crown fruit trees as rootstocks, the best one-year-selected branches of the top of the bud as a result of scion branches, the length of 10-15 cm, 0.5 cm thick above, with