The H3A-4 extraction is a new method to determine plant available nutrients but has not been compared with standard soil tests or calibrated to crop response in Manitoba, Canada. Olsen P and ammonium acetate K were related to H3A-4 P and K for 961 soil samples. Significant relations were found between Olsen P and H3A-4 (R2 = 0.74, P < 0.01) and ammonium acetate K and H3A-4 (R2 = 0.83, P < 0.01). New thresholds were established for fertilizer recommendations with H3A-4 as 24 mg kg–1 for P and 32 mg kg–1 for K.
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8 December 2024
Comparison of conventional methods with Haney H3A version 4 for available phosphorus and potassium in southern Manitoba soils
Stephen Crittenden,
Oscar Molina,
Steve Sager,
Curtis Cavers,
Zisheng Xing,
Mervin St. Luce,
Yvonne Lawley
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ammonium acetate
H3A-4
Olsen
phosphorus
potassium
southern Manitoba
