Catch crops and feeding strategy can reduce the risk of nitrogen leaching in late lactation fodder beet systems
Autor: | Brendon J. Malcolm, Nathan P. Arnold, Paul Johnstone, Steven J. Dellow, Deanne Waugh, Brendon Welten, Dawn Dalley, Hamish E. Brown, Sam Carrick, Mark Wohlers, A. Horrocks, John de Ruiter, Michael H. Beare |
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Rok vydání: | 2020 |
Předmět: |
biology
0402 animal and dairy science Soil Science chemistry.chemical_element 04 agricultural and veterinary sciences Plant Science Lolium multiflorum biology.organism_classification 040201 dairy & animal science Nitrogen Urinary nitrogen medicine.anatomical_structure Agronomy chemistry Fodder Lactation Grazing 040103 agronomy & agriculture medicine 0401 agriculture forestry and fisheries Environmental science Animal Science and Zoology Leaching (agriculture) Cover crop Agronomy and Crop Science |
Zdroj: | New Zealand Journal of Agricultural Research. 63:44-64 |
ISSN: | 1175-8775 0028-8233 |
Popis: | Autumn grazing of high-yielding forage crops such as fodder beet (FB) has increased in popularity in many regions of New Zealand. During grazing, large amounts of urinary nitrogen (N) is returned to the soil which is at risk of leaching. This study evaluated using two different catch crops of oats or Italian ryegrass (‘Italian RG’) to reduce the risk of N leaching both after FB grazing by lactating dairy cows and after lifting (i.e. un-grazed FB) in autumn. During FB grazing, cows grazed either (i) high [40% of diet dry matter (DM), with pasture; FB40] or (ii) low (25% of diet DM, with pasture; FB25) FB allocations. Both Italian RG and oats reduced soil mineral N (0–90 cm depth) by 16%–37% by August, and 53%–58% by October, compared with a fallow control (115 and 100 kg N ha−1 for August and October, respectively). The greatest reductions in soil mineral N were from oats, largely attributed to higher DM yields resulting in greater N uptake. Furthermore, the total amounts of soil mineral N in the soil after grazing differed between FB allocation treatments and lifted FB (FB25 > FB40 > lifted FB), in proportion to urinary-N inputs and associated dietary N intake. |
Databáze: | OpenAIRE |
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