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1年生苗高与幼树早期生长、分枝、结实都呈极显著正相关,因此,研究1年生合格壮苗标准,对实现油桐早实丰产有重要意义。分技是油桐进入开花结实的必须条件。1年生苗高与分技高没有明显的相关,分技高是受物种相对稳定的生物学遗传特性所控制。在涪陵地区生产条件下,油桐1年生合格苗高应在70厘米以上,这种合格苗分技早,结实早,能早实丰产。 我区油桐生产一般采用直播造林桐农混种,幼苗分散,不便管理。1年生桐苗生长矮小,往往第2不能抽分新技,形成广阔的树冠,开花结实迟,三年桐3年不能投产,有的4年生也不结实。为了探索小米桐1年生苗高标准,1982年造试验地4亩,220株,用在彭县选出的10株小米桐优树种子播种,用完全随机种植。现将4年观测结果报告于后。
The 1-year-old seedling height had a very significant and positive correlation with the early growth, branching and fruiting of saplings. Therefore, it is of great significance to study the standard of 1 year-old eligible strong seedlings to realize the early fruiting and high yield of T’atown. Technical division is the necessary condition for tung tree to flowering and fruiting. There is no obvious correlation between the height of 1-year-old seedling and the height of plantation, which is controlled by the biological genetic characteristics of relatively stable species. Production conditions in Fuling, tung tree eligible for 1-year-old seedling height should be 70 cm or more, this qualified early seedling technology, early fruiting, early solid high yield. Tung Tung production in our area generally adopt direct seeding Tongnon mixed seedlings scattered, inconvenient to manage. 1-year-old Tong Miao growth is small, often the first 2 can not be divided into new skills, the formation of a vast canopy, flowering and fruiting late, Tong three years can not be put into operation, and some 4-year-old is not strong. In order to explore the high standard of 1-year-old Millettia, 4 acres of 220 plots were made in 1982, and 10 Millettia trees selected from Pengxian were planted with completely random seeds. 4-year observations are now reported later.