试论植被氮的来源特别是关于植物是否吸收游离氮或不结合氮的问题

J. Lawes, J. Gilbert, E. Pugh
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引用次数: 12

摘要

在参考了这一主题的早期历史,特别是索绪尔的结论,即植物从土壤中的含氮化合物和他发现存在于大气中的少量氨中获得氮之后,作者们开始讨论他们自己关于植物氮来源的实验。考虑到他们自己的调查所建立的最突出的事实,即在给定的土地面积上,不同作物产生的氮量,以及这些与某些测量或已知来源的关系。在同一块土地上年复一年地种植同一种作物,而不通过肥料提供任何氮,人们发现,在14年的时间里,小麦的体重增加了30多磅。大麦,在6年的时间里,少一些干草,在3年的时间里,将近40磅。——还有豆子,11年后,超过50磅。每年每英亩的氮肥用量。三叶草,另一种豆科作物,连续4年种植了3年,平均体重达到120磅。芜菁,在连续8年里,已经长出了45磅。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the sources of the nitrogen of vegetation; with special reference to the question whether plants assimilate free or uncombined nitrogen
After referring to the earlier history of the subject, and especially' to the conclusion of Saussure, that plants derive their nitrogen from the nitrogenous compounds of the soil and the small amount of ammonia which he found to exist in the atmosphere, the Authors preface the discussion of their own experiments on the sources of the nitrogen of plants, by a consideration of the most prominent facts established by their own investigations concerning the amount of nitrogen yielded by different crops over a given area of land, and of the relation of these to certain measured, or known sources of it. On growing the same crop year after year on the same land, without any supply of nitrogen by manure, it was found that wheat, over a period of 14 years, had given rather more than 30 lbs.—barley, over a period of 6 years, somewhat less—meadow-hay, over a period of 3 years, nearly 40 lbs.— and beans, over 11 years, rather more than 50 lbs. of nitrogen, per acre, per annum. Clover, another leguminous crop, grown in 3 out of 4 consecutive years, had given an average of 120 lbs. Turnips, over 8 consecutive years, had yielded about 45 lbs.
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