Marginal responses over six years by sorghum and sunflower to broadcast and banded phosphorus on a low-P vertisol and changes in extractable soil phosphorus
1991
Hibberd, D.E. (Queensland Dept. of Primary Industries, Bundaberg (Australia). Research Station) | Want, P.S. (Queensland Dept. of Primary Industries, Bioela (Australia). Research Station) | Hunter, M.N. (Queensland Dept. of Primary Industries, Brisbane (Australia)) | Standley, J. (Queensland Dept. of Primary Industries, Toowoomba (Australia). Wheat Research Inst.) | Moody, P.W. (Queensland Dept. of Primary Industries, Indooroopilly (Australia). Agricultural Chemistry Branch) | Blight, G.W. (Queensland Dept. of Primary Industries, Rockhampton (Australia))
Sorghum dry matter yields at anthesis increased linearly with P however applied. Grain yields totalled over 5 years fitted a quadratic response curve with either method. Sunflower DM yields at anthesis increased with broadcast P in the first season only, but seed yields were unaffected by P over 4 seasons. Fertilizer P may not be needed for sunflower, but banding at about 70 kg P per ha is recommended for sorghum. Based on extractable P values, the relative effectiveness of initial broadcast and incorporated P declined over the first 4 years, but then tended to remain steady at about 0.67.
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