乌桕是一种多年生的木本油料树种。它生长快、适应性强、结果期长、收益大、用途广,在低山丘陵、江河两岸、路、水、村、宅旁以及田头、地角都可栽种,广大群众多喜爱栽植。近年来,我县为兄弟省、市和本省各县每年提供良种接穗7万余斤,嫁接苗50余万株,但还是供不应求。积极建立乌桕良种采穗圃是解决当前乌桕良种接穗供需矛盾的主要途径。几年来我们对本场和有关社、队采穗圃的产条量进行了初步调查,现将材料整理如下,供参考。一、造林密度与采条量的关系1979年春我场用两个优良无性系,采用不同造林密度营造了5.7亩采穗圃,共计813株,全部采用截千造林,截干高度为20厘米。经连续2年测定,不同密度的产条量之间存在着显著差异,每亩株数177株的,当年亩产条量为60.18斤;每亩株数107株的,亩产条量仅19.26斤(见表1)。第二年产条量仍以前者高,后者低。从不同品种方面来看,小粒鸡爪桕亩产 Blackbird is a perennial woody oilseed species. It grows fast, adaptable, long results, large benefits, wide use, in the hilly, rivers and lakes, roads, water, village, house next to the field and land angle, can be planted, the majority of the masses love to plant. In recent years, my county for the fraternal provinces, cities and counties in the province each year to provide more than 70,000 scion seed grafted, more than 500,000 grafted seedlings, but still in short supply. The active establishment of Achnatherum splendens is the main way to solve the contradiction between the supply and demand of scion of the Achnatherum splendens seed. In the past few years, we conducted a preliminary investigation on the yield of this field, the relevant community and the team’s sprouting garden. The materials are compiled as follows for reference. I. The relationship between the planting density and the volume of cuttings In the spring of 1979, I used two excellent clones and used different afforestation densities to create 5.7 mu of sprouts for a total of 813 plants. All of them were cut and reforested with a height of 20 cm. After two consecutive years of determination, there are significant differences between the yield of different densities per acre 177 strains, when the mu yield of 60.18 kg; per acre of 107 strains, the mu yield of only 19.26 kg See table 1). The second year of production is still high, while the latter is low. From different breed point of view, the small gramineus per mu yield