Effect of planting date and growth stage on secondary and micronutrient content of soybean tissue

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Abstract
Field experiments were conducted to determine the effect of planting date and cultivar [Glycine max] on B, Zn, Mn, Fe, Mg, and Ca content of soybean leaflets, petioles, and stems at beginning bloom (R1), beginning seed (R5) and physiological maturity (R7) growth stages. The concentrations of all the nutrients analyzed were influenced by planting date and cultivar in at least one year. The concentration ranges were: B, 16-167 ppm; Zn, 14-98 ppm; Fe, trace-575 ppm; Mn, 12-122 ppm; Mg, 0.18-0.89%, and Ca, 0.47-3.02%. As the plants developed, [Fe] generally decreased, [Mn] increased, and [Zn] showed no consistent response. Changes in B, Mg, and Ca concentrations with plant development varied with the plant part. Leaflet [Ca] and [B], and petiole [Ca] and [Mg] increased during seedfill. Petiole and stem [B], and stem [Mg] and [Ca] decreased during seedfill.