[논문]Effects of alfalfa and alfalfa-grass mixtures with nitrogen fertilization on dry matter yield and forage nutritive value

McDonald, Iryna; Baral, Rudra; Min, Doohong

doi:10.5187/jast.2021.e33

[해외논문] Effects of alfalfa and alfalfa-grass mixtures with nitrogen fertilization on dry matter yield and forage nutritive value 원문보기

Journal of animal science and technology : JAST, v.63 no.2, 2021년, pp.305 - 318

McDonald, Iryna (Department of Agronomy, Kansas State University) , Baral, Rudra (Department of Agronomy, Kansas State University) , Min, Doohong (Department of Agronomy, Kansas State University)

Abstract ▼ AI-Helper

Alfalfa (Medicago sativa L.) is an important forage legume grown in Kansas, USA and its productivity with cool-season grasses however is unknown. The objective of this study was to determine the dry matter yield (DMY) and forage nutritive value of alfalfa-grass mixtures compared to those of alfalfa and grasses grown in monoculture with and without nitrogen fertilization. Three different alfalfa varieties were planted (reduced-lignin alfalfa, Roundup Ready, and conventional alfalfa) and two kinds of cool-season grasses (smooth brome, Bromus inermis Leyss, and tall fescue, Festuca arundinacea Schreb) were planted as a monoculture or in alfalfa-grass mixtures. Nitrogen fertilizer (urea) was applied at green-up at a rate of 56 kg/ha and after the second cutting at a rate of 56 kg/ha in 2016 and 2017, respectively. and control treatments received no nitrogen. DMY was significantly higher in monoculture alfalfa and alfalfa-grass mixtures than in grass monocultures. Between alfalfa monoculture and alfalfa-grass mixtures, no significant differences in DMY were found. For all treatments, nitrogen application significantly increased DMY compared to the control. In 2016 and 2017, the low-lignin alfalfa monoculture had the lowest acid detergent fiber (ADF) and the grass monocultures had the highest ADF. In 2016 and 2017, neutral detergent fiber (NDF) in smooth bromegrass and tall fescue was higher than in other species treatments. A low-lignin alfalfa monoculture had significantly lower NDF concentration compared to alfalfa-grass mixtures. When averaged over 2016 and 2017, relative feed value (RFV) was highest in low-lignin alfalfa and lowest in the grass monocultures. In both years, nitrogen fertilizer application did not affect nutritive values.

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표/그림 (7)

표 Table 1. Rainfall and maximum and minimum temperatures at Ashland Bottoms Research Farm, Kansas State University during the study period
표 Table 2. Composition of alfalfa and grasses as monocultures and legume-grass mixtures
표 Table 3. Mean and total dry matter yield (Mg/ha) in 2016 and 2017
표 Table 4. Mean CP concentration (g/kg DM) in 2016 and 2017
표 Table 5. Mean ADF concentration (g/kg DM) in 2016 and 2017
표 Table 6. Mean NDF concentration (g/kg DM) in 2016 and 2017
표 Table 7. Mean RFV indexes in 2016 and 2017

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