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- W1987244145 abstract "Abstract Urea (15N-enriched) was applied at 50 kg N/ha to dairy pasture in May, June, or August 1985. Initial pasture responses were 4.6, 6.2, and 6.2 kg dry matter (DM)/kg N respectively. Corresponding residual responses were 1.8, 2.6, and 4.9 kg DM/kg N respectively. Total plant recovery (shoots + roots) of 15N by November was 31, 47, and 63% for May, June, and August applications respectively. During the slow-growing period after the May application, about half the 15N uptake was in the roots. Recovery of 15N in plant and soil (0 – 250 mm depth) by 5 – 6 months after application was 58 and 70% for May and June applications respectively. Measurements of inorganic soil 15N with depth indicated that leaching had occurred. The high recovery (99%) following the August application was associated with rapid plant uptake and immobilisation by the soil microbial biomass. At the first harvest after application, the soil microbial 15N (making up to 20% of total soil 15N) was twice as large following the August application than after the May and June applications. This fraction declined significantly by the last harvest after the August application, coinciding with a relatively large residual pasture response to applied N." @default.
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- W1987244145 date "1988-01-01" @default.
- W1987244145 modified "2023-09-27" @default.
- W1987244145 title "Influence of time of application on the fate of<sup>15</sup>N-labelled urea applied to dairy pasture" @default.
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- W1987244145 doi "https://doi.org/10.1080/00288233.1988.10421368" @default.
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