Mn Concentration in Soybean Leaf Related to Bean Yields1

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Abstract
Correlation of Mn concentration in leaf tissue with seed yield for soybean (Glycine max (L.) Merr.) requires a nutrient calibration relating Mn concentration in tissue to seed yield under field conditions. The objectives of this study were to establish the relationship of Mn concentration and seed yield and the effect of sampling time on critical Mn level under field conditions. Soybean ‘Ransom’ was grown on Olustee‐Leefield sand (Ultic Haplaquod‐Arenic Plinthaquic Paleudult) with Mn rates of 0, 5.6, 11.2, 22.4, and 56 kg/ha. Leaf samples were taken at 4, 6, 9, 12, and 16 weeks after planting and the blades were analyzed for Mn.The critical level of Mn in recently‐matured leaf blades for maximum bean yield was 7 to 10 μg/g for blades sampled at 4 to 9 weeks after planting. No substantial difference in critical Mn level was observed for the early sampling period of 4 to 9 weeks after planting. At the 12‐ and 16‐week sampling periods the critical Mn levels related to bean yield were 20 and 22 μg/g, respectively. The broad transition zone between deficiency and adequacy at the 12‐ and 16‐week sampling indicated reduced sensitivity in the Mn concentration and yield relationship. The recently matured blade (blade 2) on the main plant axis is suggested for sampling at the 9‐week period after planting for a representative indication of the Mn status of soybean under field conditions.

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