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This article in AJ

  1. Vol. 71 No. 2, p. 233-234
     
    Received: Apr 6, 1978
    Published: Mar, 1979


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doi:10.2134/agronj1979.00021962007100020004x

Critical Manganese Deficiency Level of Soybean Related to Leaf Position1

  1. K. Ohki2,
  2. F. C. Boswell2,
  3. M. B. Parker3,
  4. L. M. Shuman2 and
  5. D. O. Wilson2

Abstract

Abstract

Correct interpretation of results from plant analyses depends on many factors which include sampling the appropriate leaf blade for microelement analysis. Although numerous reports conclude that the recently matured leaf should be sampled for tissue analysis, specific information relating concentration of leaf-blade Mn by leaf position to yield of field-grown soybean (Glycine max (L.) Merr.) yield has not been reported previously. A 2-year field s t d y was conducted on an Olustee-Leefield sand (Ultic Haplaquod-Arenic Plinthaquic Paleudult) to determine the most ap ropriate leaf on the main axis for tissue analysis. Leaf samples were taken at the R2 growth stage (flower at node immediately below the uppermost node with completely unrolled leaf) from plots treated with 0 to 56 kg/ha Mn. Leaf blades sampled were one (top) down the axis in sequential order through blade five. Relationships between leaf Mn concentrations and seed yield over 2 years showed that critical Mn deficiency levels for blades one through five were 18, 13, 11, 11, and 10 ,µg/g, respectively. The critical deficiency levels for each leaf position were similar between years.

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