. A contribution to the investigation of the assimilation of free atmospheric nitrogen by white and black mustard. Mustard; Plants Assimilation; Nitrogen. ,14 solution was replaced by distilled water until the original volume was reached. The vessels contained about 6 quarts and to every quart 3 drops of a concentrated aqueous solution of chloride of iron were added. The part of the culture vessel containing the root s was pro- tected from the light by means of paper. On top of the vessel was placed a wooden cover with a round hole in the center in whicli the seedling was fixed by means of cot
. A contribution to the investigation of the assimilation of free atmospheric nitrogen by white and black mustard. Mustard; Plants Assimilation; Nitrogen. ,14 solution was replaced by distilled water until the original volume was reached. The vessels contained about 6 quarts and to every quart 3 drops of a concentrated aqueous solution of chloride of iron were added. The part of the culture vessel containing the root s was pro- tected from the light by means of paper. On top of the vessel was placed a wooden cover with a round hole in the center in whicli the seedling was fixed by means of cotton. In three of the vessels Sincvpi$ alba (Figs. 9 and 10) was planted and in tlie three others Shiapis nigra (Figs. 11 and 12). All these plants developed excellently. Six other vessels were treated exactly in the same way, but in place of two parts of nitrate of potassium, one part of chloride of potassium, later on increased to two parts, was used. All these plants died before August 1 (Fig. 13), after having developed but very little. To recapitulate: All plants icliich received fixed nitrogen were normally and completely developed both in sand and in water cultures. Of those. ii, " , " -,t Fig. 11—Water cultures of Sinapis nigra, July 31, with nitrates. which got no nitrogen, all in water cultures died, while the sand cultures of Sinapis alba did not shoiv any more development than could he explained by the nitrogen contained in the seed. The sand cultures of Sinapis nigra, however, developed so far as to indicate an assimilation of free nitrogen. To find onl whether the plants themselves were the cause of these phenomena or whether other influences, e. the action of microor- ganisms, played a role here, a series of sterilized sand and water cul- tures were made. The sterilized sand cultures were prepared as follows: The pots were glazed on the outside and the hole in the bottom was plugged up with cotton. They were then filled with the prepared sand. Subs
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Keywords: ., bookauthorunitedst, bookcentury1800, bookdecade1890, bookyear1894
