据四川省林科所情报资料室《情报交流》81年第三期介绍,开县本坪公社桃元大队十七生产队,用十株30～50年生,树势衰老,结果少或不结果的桐树,作截枝更新试验。80年3月下旬在桐树离主干60厘米以外,将主枝的二三级分枝全部砍去,并及时抹去非目的枝条,在桐树根部增施三斤左右饼肥和其他土杂肥,加厚耕作层,使油桐树有良好的立地条件。经 According to intelligence information room of Sichuan Forestry Bureau, “Information Exchange,” the third phase of 81 introduced Kaixian Ben Ping commune Taoyuan production team of seventeen teams, with ten 30 to 50 years old, tree aging, with little or no result Tung tree, cuttings for the update test. In late March 80 in the Tung tree 60 cm away from the trunk, the main branches of the second and third branches all cut off, and promptly wiped out non-purpose branches in the roots of Tong additional three kilograms of cake and other soil mixed fertilizer , Thickened farming layer, so that Tung has good site conditions. through