Effect of foliar application of boron
Foliar application of boron showed significant influence on
growth and yield attributes of cowpea (Table 2). Spraying of
boron at 4 weeks of planting (F1) recorded maximum vine
length, leaf chlorophyll content, nodule number and weight
as well as root dry weight. The same treatment significantly
increased the number of pods (24.89), pod length (17.24 cm),
pod weight (15.38 g) and finally total pod yield (283.25 g/plant
and 13.38 ton/ha). The treatment F1 registered 26% higher
number of pods and 13% greater pod yield/plant over the
control. Foliar spray of boron at 4 weeks and 6 weeks (F3)