Abstract
1. Guayule plants were grown outdoors in gravel culture over a period of 8.5 months and supplied with thirty-eight different nutrient solutions of varying anion and cation composition. Two harvests were made, one at the end of the summer growing season and one at the end of the winter-or principal rubber-accumulating season. 2. Growth and rubber accumulation were affected by nitrogen supply more than by the supply of any other major nutritional element under the conditions used. Plants which received little nitrogen and which showed reduced growth accumulated little rubber as compared with plants at higher nitrogen levels. The highest level of rubber accumulation was in plants which received 14-17 milliequivalents of nitrogen as nitrate per liter of nutrient solution. These plants contained 5.5% rubber, based on dry weight of the defoliated plant, at the winter harvest. 3. Growth and rubber accumulation were both diminished in phosphate-deficient plants as compared with plants which received abundant phos...
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