Monitoring cobalt status - experiences in the central North Island

Author:

Hawke M.F.,O'Connor M.B.,Johnston T.J.M.,Waller J.E.,Addison B.

Abstract

The requirement for 'cobalt (Co) of ruminants grazing pastures on the pumice soils of the Central Plateau was established in the late 1930s and Co topdressing to increase the Co intake of animals became commonplace from the mid-1950s. An on-farm survey in 1978-79 indicated that Co inputs could be halved because of adequate reserves of soil Co accumulated since the 1950s. However, the economic downturn in agriculture of the 1980s led to marked reductions in Co use. Follow-up surveys between 1991-93 indicated a general decline in soil and pasture Co levels. This decline was much more pronounced in areas with a poor history of Co topdressing. The 1991-93 survey results indicated a relationship between soil Co and pasture Co, Using probability analysis it was possible to indicate the soil Co level required to maintain a particular pasture Co concentration. Keywords: EDTA soil cobalt, fertiliser practice, pasture cobalt, stock health

Publisher

New Zealand Grassland Association

Subject

General Medicine

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Fortification of silage and hay crops with trace elements;New Zealand Journal of Agricultural Research;2006-09

2. Slow‐release cobalt fertilisers: What release rate is required?;New Zealand Journal of Agricultural Research;2004-06

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