Publication Date
1997
Description
Mineral concentrations of Andropogon gayanus Kunth, as affected by age of regrowth, 42 and 63 days (six and four cuttings); rate (kg/ ha/year) of N fertilizer, 0, 100 and 200, and of P2O5, 0 and 75, were evaluated on a sandy-loam Aridisol (pH 5.5) in Venezuela, using a split-split-plot experimental design with two replications. Forage mineral concentrations did not differ (P>0.05) among ages. Mean Ca, P, Mg, Na were: 0.20, 0.11, 0.10 and 0.029 %, and regarded as deficient for ruminants. Only K (1.21 %) was considered adequate. Mean Fe, Zn, Cu, Mn and Co were 57, 24, 2.7, 133 and 0.11 ppm, with severe Cu and Zn deficiencies. Fertilizer N did not influence (P>0.05) mineral composition. Forage P increased (P<0.05) and forage Co decreased (P<0.05) with P fertilization. Deficiency problems in ruminants consuming this forage are likely.
Citation
Morillo, D E.; Caraballo, A; Faria-Marmoll, J; and McDowell, L R., "Effect of Plant Age and N and P Fertilization on Mineral Composition of Andropogon Gayanus" (2024). IGC Proceedings (1997-2023). 19.
https://uknowledge.uky.edu/igc/1997/session10/19
Included in
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Effect of Plant Age and N and P Fertilization on Mineral Composition of Andropogon Gayanus
Mineral concentrations of Andropogon gayanus Kunth, as affected by age of regrowth, 42 and 63 days (six and four cuttings); rate (kg/ ha/year) of N fertilizer, 0, 100 and 200, and of P2O5, 0 and 75, were evaluated on a sandy-loam Aridisol (pH 5.5) in Venezuela, using a split-split-plot experimental design with two replications. Forage mineral concentrations did not differ (P>0.05) among ages. Mean Ca, P, Mg, Na were: 0.20, 0.11, 0.10 and 0.029 %, and regarded as deficient for ruminants. Only K (1.21 %) was considered adequate. Mean Fe, Zn, Cu, Mn and Co were 57, 24, 2.7, 133 and 0.11 ppm, with severe Cu and Zn deficiencies. Fertilizer N did not influence (P>0.05) mineral composition. Forage P increased (P<0.05) and forage Co decreased (P<0.05) with P fertilization. Deficiency problems in ruminants consuming this forage are likely.
