Publicação: Impact of Potassium and Nitrogen Fertilization on Bahiagrass Herbage Accumulation and Nutrient Concentration
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Amer Soc Agronomy
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Bahiagrass (Paspalum notatum Flugge) is the most utilized forage for beef cattle (Bos spp.) in Florida, but there is concern that bahiagrass pastures are declining due to insufficient K fertilization. Two studies determined the effects of K and N fertilization on bahiagrass herbage mass (HM) and nutritive value in field plots (Exp. 1), and greenhouse (Exp. 2). At two locations from May to December 2014 and 2015, Exp. 1 evaluated the combinations of three N fertilization levels (0, 50 kg N ha(-1) in May, or 50 kg N ha(-1) in May and August) and two levels of K fertilization (0 or 42 kg K ha(-1)). Potassium fertilization did not affect HM, crude protein (CP), or in vitro digestible organic matter (IVDOM); however, tissue K concentration increased from 10.6 to 11.2 g kg(-1) with increasing K fertilization. Plots fertilized with N had greater HM than the control, but there was no difference between plots fertilized in May only vs. those fertilized in May and August. Experiment 2 was conducted in a greenhouse in 2014 and 2015 with a factorial combination of three levels of N fertilization (0, 50, and 100 kg N ha(-1)) and four levels of K fertilization (0, 16, 33, and 66 kg K ha(-1)). There was a quadratic relationship between tissue K concentration and herbage accumulation (HA) and maximum HA occurred with tissue K concentration of 17 g kg(-1). Bahiagrass tissue K concentration and response to K fertilization are variable and can be related to fertilization levels.
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Agronomy Journal. Madison: Amer Soc Agronomy, v. 109, n. 3, p. 1099-1105, 2017.
