USING TISSUE ANALYSIS AS A TOOL TO PREDICT BAHIAGRASS PHOSPHORUS FERTILIZATION REQUIREMENT |
| |
| Authors: | Maria L Silveira Augustine K Obour Joao M Vendramini Lynn E Sollenberger |
| |
| Institution: | 1. Range Cattle Research and Education Center , University of Florida , Ona, Florida, USA;2. Agronomy Department , University of Florida , Gainesville, Florida, USA |
| |
| Abstract: | Tissue analysis in combination with soil testing has been recently incorporated in the fertilization recommendations for bahiagrass in Florida; however, limited research is available to validate the proposed critical tissue phosphorus (P) level. A greenhouse experiment was conducted to identify the critical minimum tissue P concentration below which bahiagrass dry matter (DM) yield is impacted. Treatments consisted of three nitrogen (N) rates (0, 50, and 100 kg N ha?1), four P rates (0, 20, 40, 60 kg P2O5 ha?1) and two clipping intervals (28 and 56 d). Bahiagrass yields and tissue P increased in response to P application. Phosphorus uptake showed a quadratic response to P rates when N was applied. Phosphorus recovery increased linearly as P rate increased. Root mass responded to P, even at the smallest (20 kg ha?1) rate. Data indicated that tissue P concentration of 1.3 (±0.2) g kg?1 can be used as an indicator of bahiagrass P deficiency. |
| |
| Keywords: | bahiagrass fertilization pastures phosphorus tissue analysis spodosol |
|
|
