Regulation of nitrogen fixation in a grazed pasture
Open Access
- 1 February 1978
- journal article
- research article
- Published by Taylor & Francis in New Zealand Journal of Agricultural Research
- Vol. 21 (1), 73-82
- https://doi.org/10.1080/00288233.1978.10427385
Abstract
Self-contained, rotationally grazed ryegrass-white clover pasture was established at Palmerston North on a sandy silt loam, to investigate factors regulating N-fixation in a high fertility soil. N-fixation, as estimated by the acetylene-reduction assay, gave rates of 180 and 230 kg N/ha/annum for years with a dry warm summer and a moist cool summer respectively. Seasonal and regrowth stage variation in N-fixation could be explained in terms of widely with season, from 19 to 110 kg N fixed/t legume herbage DM. Reduction of N-legume growth and soil-N uptake by legumes. N-fixation per unit of legume growth varied fixation as a result of grazing was associated with an increase in soil mineral nitrogen. The proportion of N-fixation occurring in the top 75 mm soil horizon was 90% in winter, and 10% under dry summer conditions.This publication has 22 references indexed in Scilit:
- Hydrogen evolution: A major factor affecting the efficiency of nitrogen fixation in nodulated symbiontsProceedings of the National Academy of Sciences, 1976
- The acetylene reduction assay as a means of studying nitrogen fixation in white clover under sward and laboratory conditionsGrass and Forage Science, 1976
- Response of irrigated lucerne to defoliation and nitrogen fertiliserNew Zealand Journal of Experimental Agriculture, 1974
- Growth and nitrogen fixation of pure stands of three pasture legumes with high/low phosphateNew Zealand Journal of Agricultural Research, 1973
- Some factors affecting pasture growth in SouthlandNew Zealand Journal of Experimental Agriculture, 1973
- The use of acetylene reduction to study the effect of nitrogen fertiliser and defoliation on nitrogen fixation by field-grown white cloverNew Zealand Journal of Agricultural Research, 1969
- Pasture growth and soil fertility: VIII. the influence of grasses, white clover, fertilisers, and the return of herbage clippings on pasture production of an impoverished soilNew Zealand Journal of Agricultural Research, 1965
- Effect of associated growth on yield and nitrogen content of legume and grass plantsPlant and Soil, 1962
- Effect of Available Nitrogen on Symbiotic FixationSoil Science Society of America Journal, 1955
- THE NITROGEN ECONOMY OF GRASS LEGUME ASSOCIATIONSGrass and Forage Science, 1954