Journal ArticleDOI
Transfer of fixed nitrogen from white clover to associated grasses in swards grazed by dairy cows, estimated using 15N methods
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Pasture swards containing perennial ryegrass alone or with one of five different white clover cultivars were examined for production and transfer of fixed nitrogen to grass under dairy cow grazing, indicating that below-ground N transfer was largest during dry summer conditions.Abstract:
Pasture swards containing perennial ryegrass (Lolium perenne L.) alone or with one of five different white clover (Trifolium repens L.) cultivars were examined for production and transfer of fixed nitrogen (N) to grass under dairy cow grazing. Grass-only swards produced 21% less than mixed clover-grass swards during the second year after sowing. Production from grass-only plots under a mowing and clipping removal regime was 44% less than from grass-only plots under grazing. Much of this difference could be attributed to N transfer. In swards without clover, the ryegrass component also decreased in favour of other grasses.read more
Citations
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Soil biota, ecosystem services and land productivity
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Book ChapterDOI
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Biological nitrogen fixation in mixed legume/grass pastures
S. F. Ledgard,K. W. Steele +1 more
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Nitrogen cycling in low input legume-based agriculture, with emphasis on legume/grass pastures
TL;DR: In this paper, a review of legume-grass pastures under grazing by livestock is presented, with most emphasis on temperate legume/grasspastures under moderate high production with modest N losses.
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Carbon and Nutrient Fluxes Within and Between Mycorrhizal Plants
TL;DR: In this paper, the authors investigated the role of ecto-mycorrhizal fungi in the transfer of C and nutrients between plants, and found that the amount of plant C partitioned belowground (to roots and ecto mycorrhiza) varies widely depending on the methodology used and ecosystem, and is affected by several factors such as the identity of plant and fungal species, plant nutrient content, and EM age.
References
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Journal ArticleDOI
Steam distillation methods for determination of ammonium, nitrate and nitrite
J. M. Bremner,D. R. Keeney +1 more
TL;DR: In this article, steam distillation methods of determining ammonium, nitrate, and nitrite in the presence of alkali-labile organic nitrogen compounds are described, which are used for tracer studies using 15N-enriched compounds.
Journal ArticleDOI
Ammonium Production in Soil under Waterlogged Conditions as an Index of Nitrogen Availability
TL;DR: In this paper, the authors investigated the possibility that methods involving estimation of the ammonium produced by incubation of soil under waterlogged conditions may provide an index of nitrogen availability, which led to development of the following method of assessing mineralizable soil nitrogen:
Journal ArticleDOI
Symbiotically fixed nitrogen from field- grown white and red clover mixed with ryegrasses at low levels of15N-fertilization
B. C. Boller,J. Nösberger +1 more
TL;DR: It is concluded that the annual yield of symbiotically fixed N from clover/grass mixtures can be very high, provided that the proportion of clover in the mixtures exceeds 50% of total dry mass yield.
Journal ArticleDOI
Utilization by wheat crops of nitrogen from legume residues decomposing in soils in the field.
TL;DR: Evidence that ungrazed legume residues, incorporated in amounts commonly found in southern Australian wheat growing regions, contribute only a little to soil available N and to crop N uptake, even in the first year of their decomposition is supported.
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