Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 26:352-355 (1986)
© 1986 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Benomyl Fungicide and Irrigation on Soybean Seed Yield and Yield Components1

L. G. Heatherly and G. L. Sciumbato2

Soybean [Glycine max (L.) Merr.] producers are often faced with the dilemna of using expensive inputs with little or no assurance of an economic return. In order for these inputs to be feasible, a resonable expectation of success as measured in either increased quality or quantity of seed yield is required. One such production input that has gained increased attention is the use of foliar-applied fungicides. An experiments using ‘Centenniala’ and ‘Tracy-M’ soybeans was planted in the field on 15 May 1981 and 9 May 1983 on Sharkey clay (Vectic Haplaquept, very-fine, montmorillonitic,thermic) Stoneville, MS, to determine the effect of benomyl [methyl 1-(butylcarbamoyl-2-benzimidazolecarbamate] fungicide on seed yield of irrigated and nonirrigated soybeans. Irrigation treatments were nonirrigated (NI), and irrigation started at beginning of bloom(R1) and continued whenever soil water potential (SWP) at the 30 cm (T30) and 60 cm depths (T60) dropped to between –50 and –100 kPa. Irrigation was continued through the full-seed stage (R6) in both T30 and T60. Two irrigation methods, furrow and overhead, were used. The fungicide was sprayed onto the foliage in equal amounts (0.28 kg a.i. ha–1) at Stages R3 and RS. Significant yield increases of 194 kg ha–1 in 1981 (P < 0.10) and 145 kg ha–1 in 1983 (P < 0.05) resulted from applying the fungicide to the most frequently watered treatment (T30). Use of the fungicide did not significantly affect yield in the less-watered treatment (T60) or the nonirrigated treatment. Type of irrigation had no significant effect on yield response to fungicide. Yield increases resulting from optimum (T30) irrigation were large (> 1500k g ha–1) and significant in both years, and most of the increase was attributable to increased number of seed. The yield increase that was obtained from the benomyl-treated T30 treatment was the result of about equal percentage increases in both seed weight and number of seed. These results indicate that benomyl foliar fungicide should be used only on those soybeans that will receive adequate water throughout reproductive development.

Key Words: Glycine max (L.) Merr. • Seed weight • Number of seed • Irrigation type

1 Joint contribution of USDA-ARS and the Mississippi Agric. and Forestry Exp. Stn., Stoneville, MS.

2 Research agronomist, USDA Soybean Production Res., P.O. Box 196, and plant pathologist, Delta Branch Exp. Stn., Stoneville, MS 38776.

Received for publication April 8, 1985.




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Copyright © 1986 by the Crop Science Society of America.