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- In 1954 the first experimental seed orchards were planted. 到1954年,第一批实验性种子园建立起来了。
- They have found areas suitable for seed orchard purposes. 他们找到了适于营建种子园的地区。
- Study on Establishing Graft Seed Orchard of Pinus massoniana Lamb. 马尾松无性系嫁接种子园营建技术研究。
- Smaller seed orchards are more easily managed but can't produce enough seed. 小一些的种子果园稍微好控制一点,但是又不能生产出足够多的种于。
- Intercropping in seed orchards is greatly contributed to economic benefit. 实行园内间种,有利于提高经济效益。
- Seed orchards should not be established on sites which are seriously susceptible. 种子园不应设在易受严重影响的地方。
- Its use is limited to the preservation of breeding material or the establishment of clonal seed orchards. 其用途仅限于保持育种材料或建立无性系种子园。
- But seed orchards are difficult to control, because tree pollen spreads so far that alien, non-elite trees almost inevitably muddy the gene pool. 但是有种子的果树很难控制,因为花粉传播的太远了,一些其它种类的树木就会不可避免地弄乱此基因库。
- Studies on Establishing Techniques for the Advanced Generation Seed Orchards of Pinus tabulaeformis Carr. 油松高世代种子园营建技术。
- Gibbenellic acid is now applied as a standard seed orchard treatment in many Japanese orchards. 在日本,使用赤霉酸已成为许多种子园的常规措施。
- The main function of a seed orchard is to produce seed of improved genetic quality on a regular and sustained basis. 种子园的主要作用就是经常和持续地生产改良了遗传品质的种子。
- Title: Studies on Establishing Techniques for the Advanced Generation Seed Orchards of Pinus tabulaeformis Carr. 关键词:林学;油松;高世代种子园;建立技术;高产技术
- Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem. 大多数关于种子园理论,是以假定能发生随机交配和自花受精而不会成为严重问题为依据的。
- As a result,timber companies had to grow seed by planting seed orchards,full of elite trees that were supposed to pollinate each other. 所以,林业公司只能靠培植种子的果园来培养种子。果园里种满了种树用以相互受粉。
- But seed orchards are difficult to control,because tree pollen spreads so far that alien,non-elite trees almost inevitably muddy the gene pool. 但是有种子的果树很难控制,因为花粉传播的太远了,一些其它种类的树木就会不可避免地弄乱此基因库。
- Smaller seed orchards are more easily managed but can't produce enough seeds. 小一些的种子果园稍微好控制一点,但是又不能生产出足够多的种子。
- New and more sophisticated methods of physiological control should be available to the seed orchard manager. 新的和更先进的生理控制方法,对于种子园管理人员将会有效的。
- As a result, timber companies had to grow seed by planting seed orchards, full of elite trees that were supposed to pollinate each other. ”所以,林业公司只能靠培植种子的果园来培养种子。 果园里种满了种树用以相互受粉。
- Based on the practical investigation, this paper studied economic benefit of two seed orchards of Masson pine by means of systematic methods. 在实际调查的基础上,运用技术经济分析方法,对广西几处马尾松种子园的经济效益进行了初步研究。
- It could be argued that localities subject to periodic abnormally dry earlysummer conditions should be favoured for seed orchard sites. 可以证明有周期性反常干旱早夏的地方作种子园园址应是有利的。