Theme 13: Plant Improvement
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Publication Date
2001
Location
Brazil
Description
Cultivars of timothy (Phleum pratense L.) with high N and P use efficiencies are required to reduce costs of production and risks of N and P pollution, and to meet the nutrition requirements of high producing animals. This field study aimed at comparing, (under three N rates) the relationship between DM yield, N uptake, and P uptake of 27 timothy half-sib families, plus the cultivar Champ as a control (Dry matter yield), N and P uptake increased with increasing N rates. Genotypes also differed for DM yield, N and P uptake. For a given DM yield, the genotypes had contrasting N uptake. Similarly, for a given N uptake, there was variability in P uptake. Overall, P uptake was highly correlated to N uptake. We conclude that there is genotypic variability in timothy for N use efficiency, and N and P uptake efficiencies. Our results also confirm that P uptake follows, to a large extent, variations in N uptake as an effect of N rates and genotypes.
Citation
Michaud, Réal; Bélanger, Gilles; and Brégard, A., "Variability for Nitrogen and Phosphorus Uptake among Timothy Genotypes" (2001). IGC Proceedings (1985-2023). 3.
(URL: https://uknowledge.uky.edu/igc/19/13/3)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Variability for Nitrogen and Phosphorus Uptake among Timothy Genotypes
Brazil
Cultivars of timothy (Phleum pratense L.) with high N and P use efficiencies are required to reduce costs of production and risks of N and P pollution, and to meet the nutrition requirements of high producing animals. This field study aimed at comparing, (under three N rates) the relationship between DM yield, N uptake, and P uptake of 27 timothy half-sib families, plus the cultivar Champ as a control (Dry matter yield), N and P uptake increased with increasing N rates. Genotypes also differed for DM yield, N and P uptake. For a given DM yield, the genotypes had contrasting N uptake. Similarly, for a given N uptake, there was variability in P uptake. Overall, P uptake was highly correlated to N uptake. We conclude that there is genotypic variability in timothy for N use efficiency, and N and P uptake efficiencies. Our results also confirm that P uptake follows, to a large extent, variations in N uptake as an effect of N rates and genotypes.
