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The Longevity of Cultivation in Decreasing the Potential for Phosphorus Loss in Runoff by R.W. McDowell; L.C. Smith is a Agricultural and Biological Sciences article available to read on EtoBox.

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Phosphorus (P) loss from highly fertilised grazed pastures can impair surface water quality. High P concentrations in grazed pastures are maintained to boost legume production, but systems that use monocultures of grass and clover can be more profitable and decrease P losses by lowering soil P in grassed areas. In contrast with using a direct drill to establish new pastures, conventional cultivation can lower topsoil P quickly and can be used as part of a farm re-grassing programme every six years. We tested if the potential for low P losses (measured by water extractable P; WEP) could be maintained over six years in pastures (ryegrass and white clover monocultures and a ryegrass and clover mixed sward) despite being fertilised (10, 35 and 100 kg P ha -1 ) and grazed. Cultivation (0-20 cm) decreased WEP and Olsen P in all three pastures and P rates by 30-50 % compared to direct drill and maintained this decrease for six years. A threshold in Olsen P (22 mg L -1 ) was noted where WEP concentrations increased at a greater rate relative to Olsen P than below. This threshold was like the critical point in Olsen P for 97 % relative yield in the pastures (22-28 mg L -1 ) and could be use

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Author

R.W. McDowell; L.C. Smith

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)