effect of early spring grazing and dairy cow grazing intensity on particulate phosphorus losses in surface run‐off

A four‐treatment (UG‐UG, UG‐G, LG‐G and HG‐G) experiment (involving sixteen plots: 3·0 × 7·0 m) examined the effect of early spring grazing intensity on particulate phosphorus (PP) losses in surface run‐off. Ten dairy cows fitted with manure collection ‘bags’ grazed during two short‐term grazing eve...

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Bibliographic Details
Published in:Grass and forage science 2016-03, Vol.71 (1), p.172-176
Main Authors: McConnell, D. A, Doody, D. G, Elliott, C. T, Matthews, D.I, Ferris, C. P
Format: Article
Language:English
Subjects:
bags
dairy cows
grazing
grazing intensity
pastures
phosphorus
rain
rainfall simulators
risk
run-off
runoff
soil
spring
treading
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Summary:A four‐treatment (UG‐UG, UG‐G, LG‐G and HG‐G) experiment (involving sixteen plots: 3·0 × 7·0 m) examined the effect of early spring grazing intensity on particulate phosphorus (PP) losses in surface run‐off. Ten dairy cows fitted with manure collection ‘bags’ grazed during two short‐term grazing events, Grazing‐1 (23 February) and Grazing‐2 (6 April). During Grazing‐1, two treatments remained ungrazed (UG‐), while treatments LG‐ and HG‐ were lightly grazed and heavily grazed respectively. At Grazing‐2, three treatments were grazed to a similar intensity (‐G), while one remained ungrazed (‐UG). Run‐off was generated at two and 16 days after Grazing‐1 and Grazing‐2 using rainfall simulators (40 mm h⁻¹) and analysed for a range of P fractions. Grazing had no effect on either dissolved reactive phosphorus (DRP) concentrations or dissolved unreactive P concentrations (mean, 0·15 and 0·16 mg L⁻¹ respectively) in run‐off. However, PP concentrations increased (P 
ISSN:0142-5242
1365-2494
DOI:10.1111/gfs.12183