IntroductionAn investigation was undertaken by one of the writers for the purpose of determining the minimum potassium requirements of the tomato plant. It was planned to use water cultures in these studies. Although the solutions contained the so-called essential elements for normal plant growth it was soon discovered that the plants failed to grow. Since attention had been recently called to the importance of boron and manganese it was thought that a possible solution to the problem lay in adding these elements to the culture medium and a special experiment was conducted to test their effects on the growth of the tomato. Manganese (1.0 ppm.) was added to the nutrient solution as manganese sulphate and boron (0.55 ppm.) as boric acid. The four groups noted in table I consisted of nine cultures, each containing a single plant in a two-quart Mason jar.
the crystal structure of some forms of glucose 1639 degree of accuracy. In the cases of krypton and xenon the calculated and experimental (density) values are discrepant and, as pointed out by Aston, new determinations of the densities and compressibilities of these gases should be made.
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