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This article in AJ

  1. Vol. 64 No. 3, p. 274-276
    Received: Apr 1, 1971

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Effects of Low Levels of Bromacil on Some Mineral Constituents and Forms of Nitrogen in Glycine max (L.) Merrill1

  1. H. Hiranpradit,
  2. C. L. Foy and
  3. G. M. Shear2



Certain s-triazine herbicides are known to increase the protein in plants perhaps by enhancing nutrient accumulation and/or affecting enzymatic conversion in N and carbohydrate metabolism. Conceivably, other proven inhibitors of photosynthesis could have similar effects. The present study was conducted to determine the effects of subtoxic levels of bromacil (5-bromo.3-sec-butyl-6-methyluracil) on the mineral constituents, forms of N, and growth of 28-day-old soybean [Glycine max (L.) Merrill. ‘Lee’] plants.

Soybeans were grown in soil containing various levels of bromacil under greenhouse conditions and analyzed after 28 days. Bromacil at 0.0225 ppm (0.086 µM) concentration did not significantly affect plant dry weight but significantly increased both percentages and total amounts of N and P in plant shoots compared with untreated controls. The increases in total amounts of N and P per plant were up to 15.0 and 15.6% more than the untreated controls. The treated plants took up about 18% more nitrate-N than the untreated controls, which resulted in significantly higher accumulation of protein-N + nudeic acid-N in the plants. Total amounts per plant of acid soluble-N and ammonium-N also tended to be increased. Overall, there was also an increase in amino acids that form the constituents common to nearly all protein molecules.

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