Manganese Response in Conventional and Glyphosate Resistant Soybean
2010
Loecker, Jami L. | Nelson, Nathan O. | Gordon, W Barney | Maddux, Larry D. | Janssen, Keith A. | Schapaugh, William T.
Glyphosate-resistant (GR) soybean [Glycine max (L.) Merr.] is widely produced and provides many benefits to production agriculture, however, recent reports suggest that GR soybean genetics may result in reduced Mn uptake and increased response to Mn fertilization. The objective of this research was to determine response of GR and conventional (CV) soybean near-isolines to Mn fertilization. The soybean near-isoline pair KS4202 and K4202RR was planted at three locations and near-isoline pair KS4602N and KS4602NRR was planted at two locations in a split-block field study. Manganese treatments consisted of soil-applied MnSO₄ at 0, 2.8, 5.6, and 8.4 kg Mn ha⁻¹ and foliar applied Mn-glucoheptonate at 0.22 and 0.45 kg Mn ha⁻¹ Leaf tissue was analyzed for Mn at R1, R3, and R6 growth stages and seed was analyzed for Mn at harvest. Manganese concentrations in leaf tissue were above the critical value and were not affected by GR genetics at any location or growth stage. However, there were yield responses to Mn applications at three of the five locations. KS4202RR soybean yield increased by 800 and 275 kg ha⁻¹ with increasing Mn application rate at two locations when the near-isoline KS4202 yield did not increase. In contrast, at the third responsive location KS4602NRR did not respond to Mn application when the near-isoline KS4602N yield increased by 450 kg ha⁻¹ These results indicate that although soybean response to Mn is influenced by genetics, neither the Mn uptake nor the Mn responsiveness were conclusively affected by glyphosate-resistance in soybean.
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