文冠果树当前存在的主要问题是品种混杂,良莠不齐,单位面积产量低。据分析,在目前栽培的文冠果群体中有1/3的丰产母树(占总产量的3/4左右);有1/3的平产母树(占总产量的1/5左右);其余1/3不结实或结实很少。所以从现有母树中选择优良单株,经过后代测定培育出丰产优质品种,是当前生产中迫切需要解决的问题。为此,我们从1974年开始进行文冠果的选优工作,6年来通过初选、筛选和决选,最后选出1株丰产优质单株,即内林53号。选择标准及其优良性状如下: The main problem currently exists in the fruit tree is mixed varieties, good and bad, low yield per unit area. According to the analysis, one-third of the high-yielding parent trees (about 3/4 of the total output) are present in the currently cultivated Xanthoceras sorbifolia population; one-third of the total-yielding parent trees (about 1/5 of the total output); the rest 1/3 is not strong or sturdily few. Therefore, it is an urgent problem to be solved in current production to select fine single plants from the existing mother trees and to produce high-yielding and high-quality varieties through the determination of the offspring. To this end, we started from the selection of the text of Xuan Guan Guo since 1974, six years through the primaries, screening and selection, the final selection of a high yield and quality of single plant, that Nene 53. Selection criteria and their excellent traits are as follows: