Offered Papers Theme A: Efficient Production from Grassland
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Publication Date
2005
Location
Dublin Ireland
Description
Taproot nitrogen reserves (TN, kg N/ha) a function of N concentration within taproots (N%) and taproot biomass (TBM) are a major determinant of lucerne (Medicago sativa L.) growth rates after defoliation and in early-spring (Avice et al., 1997b). Several studies have shown that N% changes with seasons (Cunninghan & Volenec, 1998) and defoliation frequencies (Avice et al., 1997a). However the seasonal pattern of TBM deserves further investigation as the dynamics of root reserves is a weak point in lucerne simulation models (Confalonieri & Bechini, 2004). The objective of this experiment was to assess the seasonal variation in TN through the measurement of TBM and N% of lucerne crops subjected to two defoliations frequencies.
Citation
Teixeira, E. I.; Moot, D. J.; Brown, H. E.; and Mickelbart, M., "Seasonal Variation of Taproot Biomass and N Content of Lucerne Crops Under Contrasting Grazing Frequencies" (2005). IGC Proceedings (1985-2023). 442.
(URL: https://uknowledge.uky.edu/igc/20/themeA/442)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Seasonal Variation of Taproot Biomass and N Content of Lucerne Crops Under Contrasting Grazing Frequencies
Dublin Ireland
Taproot nitrogen reserves (TN, kg N/ha) a function of N concentration within taproots (N%) and taproot biomass (TBM) are a major determinant of lucerne (Medicago sativa L.) growth rates after defoliation and in early-spring (Avice et al., 1997b). Several studies have shown that N% changes with seasons (Cunninghan & Volenec, 1998) and defoliation frequencies (Avice et al., 1997a). However the seasonal pattern of TBM deserves further investigation as the dynamics of root reserves is a weak point in lucerne simulation models (Confalonieri & Bechini, 2004). The objective of this experiment was to assess the seasonal variation in TN through the measurement of TBM and N% of lucerne crops subjected to two defoliations frequencies.
