Publication Date
1985
Location
Kyoto Japan
Description
Improved While clover (Trifolium re pens L.) cul ti vars can potentially increase the input of nitrogen (N) from symbiotic fixation into clover-grass pastures and maintain elevated N2 fixation rates in the presence of nitrogenous fertilizers. The objective of this study was to determine the effects of interspecific competition on N2 fixation and mineral N uptake in white cover-perennial ryegrass (Lolium perenne L.) associations with either a medium-small ('Grasslands Huia') or large leaved ('G18') cultivar. The clover and grass were grown in a controlled environment room in pots that were partitioned to allow either no interspecific competition for shoots and roots, full competition, shoot competition only, and root competition only. Pots recieved a nutrient solution containing 1.4 mM Nor 14.3 mM N and was enriched with 1sN to allow determination of mineral N uptake and atmospheric N2 fixation. Percentage clover N derived from fixation was greater in full and root competition than in no and shoot competition at both N levels, with the effect being more pronounced at high N. G18 fixed a greater proportion of its N than Huia, although mineral N uptake was the same in both cul ti vars. Both the percentage and amount of N2 fixed were depressed by the higher N level but were depressed to a greater extent in the no and shoot competition than in full and root. Gl8 fixed more N than Huia at both N levels, and would thus be expected to adapt better than Huia to N-fertilized pastures.
Citation
West, C P.; Steele, K W.; and Halligan, E A., "Competition Effects on Nitrogen Fixation and Mineral N Uptake in Trifolium repens L.- Lolium perenne L. Associations" (1985). IGC Proceedings (1985-2023). 7.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/7)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Competition Effects on Nitrogen Fixation and Mineral N Uptake in Trifolium repens L.- Lolium perenne L. Associations
Kyoto Japan
Improved While clover (Trifolium re pens L.) cul ti vars can potentially increase the input of nitrogen (N) from symbiotic fixation into clover-grass pastures and maintain elevated N2 fixation rates in the presence of nitrogenous fertilizers. The objective of this study was to determine the effects of interspecific competition on N2 fixation and mineral N uptake in white cover-perennial ryegrass (Lolium perenne L.) associations with either a medium-small ('Grasslands Huia') or large leaved ('G18') cultivar. The clover and grass were grown in a controlled environment room in pots that were partitioned to allow either no interspecific competition for shoots and roots, full competition, shoot competition only, and root competition only. Pots recieved a nutrient solution containing 1.4 mM Nor 14.3 mM N and was enriched with 1sN to allow determination of mineral N uptake and atmospheric N2 fixation. Percentage clover N derived from fixation was greater in full and root competition than in no and shoot competition at both N levels, with the effect being more pronounced at high N. G18 fixed a greater proportion of its N than Huia, although mineral N uptake was the same in both cul ti vars. Both the percentage and amount of N2 fixed were depressed by the higher N level but were depressed to a greater extent in the no and shoot competition than in full and root. Gl8 fixed more N than Huia at both N levels, and would thus be expected to adapt better than Huia to N-fertilized pastures.
