Methods of assessing boron availability to kiwifruit plants growing on high boron soils
1997
Tsadilas, C.D. | Dimoyiannis, D. | Samaras, V.
Five soil boron (B) extraction methods were evaluated for their ability to predict available B to kiwifruit plants in soils with high B concentration. The methods were hot water soluble (Hws-B), 0.05M mannitol in 0.01M calcium chloride (CaCl2) extractable (Man-B), 0.05M hydrochloride acid (HCl) soluble (HCl-B), resin extractable (Resin-B), and saturation extract (Sat-B). The amounts of B recovered by the first four methods investigated were strongly correlated with each other, the highest correlation obtained being between Hws-B and HCl-B. Plant B was highly correlated to the B recovered by the first four extractants and poorly correlated to the B determined by the saturation method. Soil B concentrations corresponding with B toxicity in kiwifruit are 0.51, 0.80, 0.18, and 2.0 micrograms.g-1 soil for Hws-B, Man-B, HCl-B, and Res-B, respectively. The coefficients of determination in some cases were improved when in the regression equations, soil pH and clay content were included.
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