科研之友
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摘要
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.
- 出版日期2011
