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Fig. 1. Manganese concentration as influenced by Bothriochloa caucasica, B. ischaemum, and B. bladhii; and influenced by dryland and irrigation levels of low, medium, and high. Data for months July and October, and years 2002 and 2003 were combined. A Indicates a significant contrast of dryland vs. irrigated levels (P < 0.05) within one plant species. x, y Indicates a linear (x) or quadratic (y) response of manganese concentration to increased irrigation within one plant species (P < 0.05). a, b, c Means not followed by the same superscript differ in manganese concentration within a single water treatment (P < 0.05). NS Not significant at P < 0.05.
