Soil pH and exchangeable aluminium in contrasting New Zealand high and hill country soils
DOI:
https://doi.org/10.33584/rps.16.2016.3245Abstract
Soil acidity and associated aluminium (Al) toxicity severely limit the establishment and growth of legumes in New Zealand high country pastures. A survey of 13 soils differing in location, soil order, parent material and climate, showed soil pH to range from 4.9 to 6.4 and exchangeable Al (0.02M CaCl2) concentrations of <0.5 to 23.3 mg/kg. At all sites and at varying soil pH ô€„ô€‘ô€‡ô€€ƒ ô€“ô€•ô€’ô€‚¿ô€ô€ˆô€€ƒ ô€‡ô€ˆô€“ô€—ô€‹ô€–ô€€ô€€ƒ ô€€¤ô€ô€€ƒ ô€šô€„ô€–ô€€ƒ ô€“ô€•ô€ˆô€–ô€ˆô€‘ô€—ô€€ƒ ô€„ô€—ô€€ƒ ô€†ô€’ô€‘ô€†ô€ˆô€‘ô€—ô€•ô€„ô€—ô€Œô€’ô€‘ô€–ô€€ƒ above the toxicity threshold for sensitive legumes. Brown soils had the overall highest Al concentrations from 0.8 to 23.3 mg/kg, and volcanic soils the lowest from <0.5 to 6.7 mg/kg. The soil and environmental factors other than soil pH that drive variability in soil exchangeable Al require further investigation. Keywords: soil pH, soil exchangeable aluminium, toxicity, soil type
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