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Influence of Irrigation on Mineral Concentrations in Three Old World Bluestem Species

^a Agronomy Dep., Iowa State Univ., Ames, IA 50011-1010
^b Dep. of Plant and Soil Science, Texas Tech Univ., Lubbock, TX 79409-2122
^c Dep. of Range, Wildlife, and Fisheries, Texas Tech Univ., Lubbock, TX 79409-2122

View larger version (15K): [in a new window]   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.

View larger version (24K): [in a new window]   Fig. 2. Uptake of P as influenced by Bothriochloa caucasica, B. ischaemum, and B. bladhii; and influenced by dryland and irrigation levels of low, medium, and high in July and October. Data for years 2002 and 2003 were combined. a, b Means not followed by the same superscript differ in P uptake within a single water treatment (P < 0.05). NS Not significant at P < 0.05.

View larger version (25K): [in a new window]   Fig. 3. Uptake of N as influenced by Bothriochloa caucasica, B. ischaemum, and B. bladhii; and influenced by dryland and irrigation levels of low, medium, and high in July and October. Data for yr 2002 and 2003 were combined. a, b, c Means not followed by the same superscript differ in N-uptake within a single water treatment (P < 0.05). NS Not significant at P < 0.05.