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This article in AJ

  1. Vol. 79 No. 2, p. 297-302
     
    Received: Apr 16, 1986
    Published: Mar, 1987


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doi:10.2134/agronj1987.00021962007900020024x

Yield and Biochemical Response of Sugarbeet to Benomyl1

  1. G. A. Smith and
  2. S. S. Martin2

Abstract

Abstract

Two field studies were conducted to determine the effects of the systemic fungicide benomyl [methyl l-(butylcarbamoyl)-2-benzimidazolecarbamate] applied at protectant levels to the foliage of sugarbeet (Beta vulgaris L.), on yield components, recoverable sucrose, and six root extract chemical constituents. In the initial study (1980 and 1981), six benomyl applications (271 g a.i. ha−1, at 2-week intervals beginning in late June) to disease-free sugarbeets significantly increased yield components and decreased amino N, total N, and betaine. The objective of the second study (1982–1984) was to determine the effect of timing and number of benomyl applications during the growing season. In each year, five benomyl treatment regimes, ranging from single applications to six sequential applications, were evaluated for their effects. All non-sucrose chemical component means across cultivars decreased as a result of benomyl treatment. These reductions were consistent and statistically significant for total N, amino N, and betaine. Means for sucrose, purity, and root weight increased in response to benomyl in 1980 and 1981 although not significantly so for sucrose. There was a significant year-effect on changes in yield components and lack of consistency for any given treatment on extract chemical composition. Thus, these data did not point to a specific physiological basis for the observed effects.

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