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Duration-controlled grazing of dairy cows. 2: nitrogen losses in sub-surface drainage water and surface runoff.
- Source :
- New Zealand Journal of Agricultural Research; Mar2019, Vol. 62 Issue 1, p48-68, 21p
- Publication Year :
- 2019
-
Abstract
- The annual quantities of nitrate-N (-N) and total N (TN) leached from mole and pipe drained dairy pastures on a Pallic soil, were reduced by an average of 52% and 42% (p < .05), respectively, by standing cows off pasture to ruminate and rest after grazing (Duration-controlled grazing, DC), compared to the standard grazing management (SG) of leaving cows at pasture between milkings. For the SG treatment, measured -N leached was 13, 8 and 21 kg N ha<superscript>−1</superscript> and total N leached was 18, 13 and 26 kg N ha<superscript>−1</superscript> in 2009, 2010 and 2011, respectively. Annual surface runoff contained <1 kg -N ha<superscript>−1</superscript> y<superscript>−1</superscript> and <3 kg TN ha<superscript>−1</superscript> y<superscript>−1</superscript>. The deposition of urine in the autumn period had the greatest influence on the quantity of leached in winter drainage. DC grazing is a practical method to reduce N leaching from grazed dairy pastures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00288233
- Volume :
- 62
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- New Zealand Journal of Agricultural Research
- Publication Type :
- Academic Journal
- Accession number :
- 133506829
- Full Text :
- https://doi.org/10.1080/00288233.2017.1418396