为了评估品种、氮用量、打顶高度和上部叶分次采收对生产顶叶等级的影响，从2002 - 2004年进行了研究。

Research was conducted from 2002 through 2004 to evaluate the effects of variety, nitrogen rate, topping height, and separation of the upper-stalk tobacco at harvest on production of tip grades.

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一种柏木属的常绿树和灌木，原产于欧亚大陆和北美洲，而且长有成鳞片状的对生叶和木质的球果。

Any of various evergreen trees or shrubs of the genus Cupressus, native to Eurasia and North America and having opposite, scalelike leaves and globose, woody cones.

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忍冬一种忍冬属的灌木或藤本植物，有对生叶，芳香的常成对的管状花和小浆果。

Any of various shrubs or vines of the genus Lonicera, having opposite leaves, fragrant, usually paired tubular flowers, and small berries.

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