Abstract
Boron (B) nutrition problems of cacao (Theobroma cacao L.) in Nigeria deserve continuous attention in view of the fact that more cocoa-growing areas showing B deficiency are being brought to light. Omotoso (1975) examined plant tissue B and B extractable by hot water in relation to the appearance of B deficiency symptoms on cacao leaves and found that B deficiency symptoms had no direct relation to hot-water-soluble (HWS) B in the Nigerian soils studied. Omotoso (1975) then suggested further investigations to identify soil properties that can improve the capacity of HWS B to predict cacao uptake of B.
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