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Accumulation and Distribution of P, Fe, Mn, and Zn by Selected Determinate Soybean Cultivars Grown With and Without Irrigation¹

Reports on accumulation and distribution of nutrients by determinate soybeans [Glycine max (L.) Merr.] when grown under field conditions have seldom included information about micronutrients or made comparisons among several cultivars grown with or without irrigation. To provide this information, we grew three or four determinate soybean cultivars with or without irrigation on a Norfolk loamy sand (fine-loamy , siliceous thermic Typic Paleudults) during 1978 and 1979. Plant samples were collected periodically throughout the growing season to measure dry matter accumulation and distribution among the leaves, petioles, stems, and pods. Plant fractions were analyzed for P, Fe, Mn, and Zn. Total P accumulation reflected total dry matter production and was greater in plants which received irrigation during periods of water stress. The total P and Zn accumulation among cultivars was generally not significantly different, although the P and Zn concentrations in the cv. Ransom were frequently higher. The concentrations and accumulations of Fe and Mn were generally not influenced by cultivar. Irrigation appeared to enhance P diffusion to plant roots and increased P concentrations at some samplings, but it rarely influenced Fe, Mn, or Zn concentration or accumulation. Total P, Fe, Mn, and Zn accumulations were greater during 1979 due to earlier planting, a shorter period of drought, and more available soil water in the lower part of the profile. Accumulation of these nutrients reflected plant growth, but seed yields did not follow the same pattern. With irrigation, 1979 seed yields averaged 1.95 metric tonsha compared to average irrigated yields of 3.16 metric tons/ha in 1978. Nonirrigated yields averaged 1.72 and 1.62 metric tons/ha in 1978 and 1979, respectively. Seed yields did not appear to be limited by P or micronutrient accumulation. Also, for these determinate cultivars yields were not closely related to total dry matter production.

Key Words: Soybean varieties • Soybean production • Nutrient accumulation • Glycine max L. Merr. • Plant analyses

² Soil scientists, Florence, SC 29502.

Received for publication May 21, 1981.

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