Dairy effluent effects on herbage yield and nutritive value of forage cropping systems
2002
Macoon, B. | Woodard, K.R. | Sollenberger, L.E. | French, E.C. III. | Portier, K.M. | Graetz, D.A. | Prine, G.M. | Van Horn, H.H. Jr
The utilization of dairy waste effluent provides nutrients and water for crop growth and allows producers to comply with regulations governing on-farm recycling of nutrients. Dry matter (DM) yield and nutritive value were measured for forages from five year-round cropping systems at effluent N rates of 450, 675, and 900 kg ha(-1) yr(-1) during 4 yr on a Kershaw fine sand (coated, thermic Typic Quartzipsamments) in northern Florida. Cropping systems were rye (Secale cereale L.) grown in tandem with either bermudagrass (Cynodon spp.), corn (Zea mays L.)-bermudagrass (CBR), corn-forage sorghum [Sorghum bicolor (L.) Moench; CSR], rhizoma peanut (Arachis glabrata Benth.; PR), or corn-rhizoma peanut (CPR). Annual yields increased with N level in Years 1 and 2, but not during Years 3 and 4. Yields were similar among BR, CBR, and CSR (25.9 Mg ha(-1)) in Year 1. In Year 2, BR (31.2 Mg ha(-1)) had the greatest yield followed by CBR and CSR (avg. 25.5 Mg ha(-1)). In Years 3 and 4, yields of BR (21.1 Mg ha(-1)) and CBR (20.7 Mg ha(-1)) declined while yield of CSR remained constant. Systems CPR and PR yielded less during the 4 yr (17.6 Mg ha(-1)). In vitro digestibility of BR (580 g kg(-1)) was lower than for the other systems (mean of 653 g kg(-1)). Cropping system had a major impact on forage yield and nutritive value, but N rates above 450 kg ha(-1) had relatively little effect on these responses.
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