Collection, storage and handling of plant genetic resources and their global distribution are essential components of international crop and tree improvement programmes.
植物遗传资源的收集、存储和处理以及它们在全球的分布，是国际作物和树木改良计划的重要成分。
Meanwhile, pests such as tree-killing beetles and crop-killing fungi will both increase their range and breed more rapidly.
同时，专杀树林的甲壳虫和专杀作物的真菌都会扩大活动范围，也会更加迅速繁殖。
Pecans are the only major tree nut native to the U.S., which produces about 80 percent of the world's crop.
美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。
Pecans are the only major tree nut native to the U. S., which produces about 80 percent of the world's crop.
美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。
In 1962, Stylosanthes was firstly introduced to Hainan of China as a cover crop in rubber tree plantation from Malaysia.
我国于1962年首次从马来西亚引种柱花草到海南岛，作为橡胶园的覆盖作物。
The apple tree, which was swaying gently in the breeze, had a good crop of fruit.
那棵苹果树硕果累累，在微风中轻轻摇曳。
The activity of soil microorganism is inhibited at low dose. At high dose, the crop yield is decreased by 10%, and on acid soil, by 50%. Alfalfa and tree are also yield decreased.
低剂量时，即可使土壤微生物活性受到抑制，高剂量时可使农作物减产1 0 % ，在酸性土壤上减产达50 %以上，对苜蓿及树木也同样引起减产。
The tree root distribution and management study is to select tree root type which fit in with the needs of crop.
其中林木根系分布与管理研究内容是通过对林木根系类型的筛选，选择与农作物根系矛盾较小的树种；
According to the light distribution law of the fruit-crop planting ecosystem the reasonable planting way and the reasonable shape of tree, the height of tree, the range of crown and other index ca...
根据果粮间作生态系统的光照分布规律可以确定合理的栽植方式和合理的树形、树高、冠幅等指标。
The rubber tree (Hevea brasiliensis) has been an important economic crop which has a large-scale cultivation in the tropical and subtropical regions, and 99% natural rubber comes from it.
巴西橡胶树是热带、亚热带地区大范围种植的一种重要的产胶植物，99%以上天然橡胶来源于巴西橡胶树。
The rubber tree (Hevea brasiliensis) has been an important economic crop which has a large-scale cultivation in the tropical and subtropical regions, and 99% natural rubber comes from it.
巴西橡胶树是热带、亚热带地区大范围种植的一种重要的产胶植物，99%以上天然橡胶来源于巴西橡胶树。
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