Boron deficiency in sugar cane, oil palm and other monocotyledons on volcanic soils of Ecuador.

Deficiency symptoms and factors making B deficiency common and difficult to correct are described. B deficiency in cacao was not correlated with leaf-B content. Soil analysis suggested a critical B level between 0.25 and 0.5 ppm water- soluble B. Recognition of visual symptoms remained essential for B-deficiency diagnosis. 35 references. (Abstract retrieved from CAB Abstracts by CABI’s permission