Matéria seca, digestibilidade in vitro e composição químico-bromatológica do capim (Paspalum notatum ) cv. 'tifton 9' com diferentes idades

Vendramini, J. M. B.; Haddad, Cláudio Maluf; Castro, Flávio Geraldo Ferreira; Vieira, Andrea Campmany; Heisecke, Osvaldo Ruben Peralta; Tamassia, Luis Fernando Monteiro

doi:10.1590/s0103-90161999000300018

Cited by 4 publications

References 9 publications

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Agronomic and environmental impacts of phosphorus fertilization of low input bahiagrass systems in Florida

Obour

Silveira

Vendramini

et al. 2010

Nutr Cycl Agroecosyst

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Phosphorus management in low input bahiagrass (Paspalum notatum Flugge) systems represents a major challenge of agronomic and environmental importance. Concerns over agricultural P transport to surface waters have prompted several revisions in the P fertilizer recommendations for bahiagrass in Florida. This study evaluated the effects of revised P fertilizer recommendations on forage dry matter yield (DMY) and nutritive value and the potential impacts on water quality in bahiagrass pastures growing on a Spodosol. Treatments consisted of the factorial combination of three N rates (0, 56, and 112 kg N ha -1 ) and four P rates (0, 5, 10, and 20 kg P ha -1 ), replicated three times and applied annually in May of 2007 and 2008. Forage was harvested at 28-d intervals and DMY, tissue P and crude protein concentration, and P uptake were measured. To monitor P leaching potential, suction cup lysimeters were installed at 15-, 30-, 60-, 90-, and 150-cm depths. In 2007, bahiagrass DMY was not affected by P; however, in 2008 there was a linear increase in DMY from 6.9 to 8.2 Mg ha -1 as P rate increased. In both years, tissue P increased linearly from 2.1 to 2.5 g kg -1 as P rates increased from 0 to 20 kg P ha -1 . Similarly, P uptake increased from 14 kg P ha -1 for the control to 19 kg P ha -1 for the treatment receiving 20 kg P ha -1 . During the 2-year study, P fertilization had no impact on soil Mehlich-1, water-extractable P, and leachate P concentrations. Leachate P concentrations at the 15-and 30-cm depths varied seasonally (from 0.05 to 0.85 mg P l -1 ), with greater spikes occurring during periods of high water table conditions. Current P fertilization recommendation can increase bahiagrass DMY with no adverse impacts on water quality.

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Agronomic and environmental impacts of phosphorus fertilization of low input bahiagrass systems in Florida

Obour

Silveira

Vendramini

et al. 2010

Nutr Cycl Agroecosyst

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Land Application of Aluminum Water Treatment Residual to Bahiagrass Pastures: Soil and Forage Responses

et al. 2013

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Phosphorus transport is an environmental concern, particularly in coarse‐textured soils with minimal P‐sorbing capability. This 2‐yr study evaluated the impact of an Al water treatment residual (Al‐WTR) application on soil P responses, leachate P concentrations, and bahiagrass (Paspalum notatum Flüggé) yield and nutritive value. Treatments were a factorial combination of three Al‐WTR levels (0, 35, and 70 Mg ha–1) and two methods of application (surface vs. incorporated), replicated four times in a randomized complete block design. Forage was harvested at 28‐d intervals from May to November 2007 and 2008 and analyzed for neutral detergent fiber and tissue mineral concentrations. Soil samples were collected in August 2006, before the Al‐WTR application, and in November 2007 and 2008. Shallow groundwater P was monitored using a piezometer installed at the 60‐cm depth. Soil water‐extractable P and leachate P concentrations decreased as Al‐WTR application level increased. Mehlich‐1 Al and soil P storage capacity values increased linearly as Al‐WTR application level increased. Soil disturbance due to incorporation of Al‐WTR resulted in horizontal P transport in the soil. Incorporation of Al‐WTR caused a yield suppression in Year 1 (∼11% compared with surface application), but no negative effect was observed in Year 2. Neutral detergent fiber and crude protein were not affected by Al‐WTR application level or method. Data indicate that Al‐WTR reduced P mobility in a Spodosol with no impact on forage responses except for a light reduction in yield in the first year if Al‐WTR was incorporated.

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Herbage Responses to Dogfennel Cover and Limited Nitrogen Fertilization in Bahiagrass Pastures

et al. 2018

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Core Ideas Dogfennel ground cover negatively impacted bahiagrass herbage responses. Bahiagrass provided satisfactory herbage mass in areas with low dogfennel cover in May and June. Limited N fertilization did not change the herbage dynamics of bahiagrass stands competing with varying percentages of dogfennel cover. Further research should be conducted with additional bahiagrass cultivars, soil types, and N fertilizer rates. Nitrogen fertilization is an important management practice in bahiagrass (Paspalum notatum Fluegg) pastures; however, the use of N has been limited in forage‐based livestock systems in Florida. Dogfennel [Eupatorium capillifolium (Lam.) Small] is currently the most common broadleaf weed in bahiagrass pastures. We hypothesize that limited N fertilization might exacerbate dogfennel competition leading to greater declines of bahiagrass herbage responses. Field experiments were conducted in 2007 and 2008 to quantify the effects of dogfennel‐free, low, medium, and high dogfennel cover (0, 1 to ≤25, 26 to 74, and ≥75%) and limited N fertilization (56 kg N ha−1 yr−1) on bahiagrass herbage mass (HM), dogfennel biomass, bahiagrass herbage accumulation (HA) reduction, and bahiagrass crude protein (CP) concentration. Dogfennel biomass was greater for N‐fertilized plots vs. non‐fertilized plots at all monthly evaluations. Bahiagrass HM was satisfactory when dogfennel cover was low early in growing season; however, bahiagrass HM was 29 to 60% and 43 to 71% less in medium and high cover plots, respectively than dogfennel‐free plots. Conversely, bahiagrass CP was negatively affected by dogfennel only when harvested in June and July. Bahiagrass HA reduction increased as dogfennel cover increased in both years. Results from these field trials suggested that dogfennel cover negatively impacted bahiagrass herbage responses, except for low dogfennel cover early in the growing season. Additionally, limited N fertilization did not change the herbage dynamics of bahiagrass stands competing with varying percentages of dogfennel cover. Further research should evaluate additional bahiagrass cultivars, soil types, and N fertilizer rates.

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Matéria seca, digestibilidade in vitro e composição químico-bromatológica do capim (Paspalum notatum ) cv. 'tifton 9' com diferentes idades

Cited by 4 publications

References 9 publications

Agronomic and environmental impacts of phosphorus fertilization of low input bahiagrass systems in Florida

Agronomic and environmental impacts of phosphorus fertilization of low input bahiagrass systems in Florida

Land Application of Aluminum Water Treatment Residual to Bahiagrass Pastures: Soil and Forage Responses

Herbage Responses to Dogfennel Cover and Limited Nitrogen Fertilization in Bahiagrass Pastures

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