The objective of this study was to determine the
optimal concentration of boron (B) to obtain the highest
growth, yield, and oil content of black sesame. A field
experiment was conducted in a completely randomized
block design with five treatments and five replications.
Treatments included foliar application of B at five rates:
control, 50, 100, 150, and 200mg L−1 at 25 and 35 days after
sowing. Results showed that spraying B on leaves increased
sesame growth in terms of plant height, number of leaves,
and chlorophyll content. Moreover, spraying B increased
yield components including the number of pods; the
highest pods per plant was 46.2 in the B application treatment
with 150mg L−1 compared to the control with 27.2
pods per plant. The grain yield of the B spray treatment
produced 1.10–1.32 t ha−1, with the highest yield at the
dose of 150mg L−1 and the lowest yield at no B spray treatment.
Spraying B on leaves at optimal concentration also
increased the oil content in seeds up to 5.3% compared to
the control treatment. The findings of the study suggest
that foliar B application with 150mg L−1 increases the
growth, fruit set, seed yield, and oil content in sesame.