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DC Edmeades, JD Morton, JE Waller, AK Metherell, AHC Roberts & P Carey. (2010) The diagnosis and correction of potassium deficiency in New Zealand pastoral soils: a review. New Zealand Journal of Agricultural Research 53:2, pages 151-173.
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P. L. Carey & A. K. Metherell. (2003) Monitoring long‐term changes in reserve potassium in some New Zealand soils using a modified sodium tetraphenyl‐boron method. New Zealand Journal of Agricultural Research 46:3, pages 199-213.
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P. H. Williams, M. J. Hedley & P. E. H. Gregg. (1989) Uptake of potassium and nitrogen by pasture from urine-affected soil. New Zealand Journal of Agricultural Research 32:3, pages 415-421.
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P.H. Williams, J.D. Morton & B.L.J. Jackson. (1986) Chemical soil test prediction of pasture responses to potassium on recent soils of the South Island west coast. New Zealand Journal of Experimental Agriculture 14:4, pages 411-415.
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B. L. J. Jackson. (1985) A modified sodium tetraphenylboron method for the routine determination of reserve-potassium status of soil. New Zealand Journal of Experimental Agriculture 13:3, pages 253-262.
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C. During & R. Campkin. (1980) Sources of potassium taken up by ryegrass from some soils of the North Island. New Zealand Journal of Agricultural Research 23:1, pages 85-91.
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