Availability and uptake of boron in a group of pedogenetically-related Canterbury, New Zealand soils
1991
Adams, J.A. (Lincoln Univ., Canterbury (New Zealand). Dept. of Soil Science) | Hamzah, Z. (Malaysian Rubber Research Inst., Kuala Lumpur (Malaysia)) | Swift, R.S. (Reading Univ., Reading (United Kingdom). Dept. of Soil Science)
Amounts of B extracted from 6 of the soils by hot water (HW), hot 0.02 M CaCl2 (HC), 0.01 m CaCl2 + 0.05 M mannitol (CM), and a B-specific resin (R) were significantly correlated with each other. HW and HC yielded higher levels of extractable B than did CM and R. B extracted by all 4 reagents was significantly correlated with soil organic C (and to a lesser extent clay content), but not with soil pH. All 4 extractants were shown in glasshouse pot experiments to be suitable for assessing the B available to radishes. Decreased yields occurred in soils with HW or HC extractable B levels less than 1.1 microg per g and were associated with a progressively lower allocation of dry matter to roots. For analytical purposes, HC provided the most convenient measure of available B.
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