| dc.description.abstract | Four experiments were carried out at the char land of Jaldhaka upazila under Nilphamari
district, during September 2018 to August 2019 to investigate the performances of
brinjal, okra, sweet gourd and chili in mahogany and litchi based agroforestry systems.
The experiments were laid out with single factor Randomized Complete Block Design
(RCBD). The treatments for brinjal experiment were T1= Mahogany + brinjal and T2=
brinjal sole cropping. Whereas the treatments for okra experiment were four different
distances from mahogany tree base .i.e. T1 = 40 cm from tree base, T2= 80 cm from tree
base, T3= 120 cm from tree base and T4= 160 cm from tree base. Again, the treatments
for sweet gourd experiment were three different planting spacings i.e. T1 = Pit to pit
spacing: 2.5 m, T2= Pit to pit spacing: 2.0 m, and T3= Pit to pit spacing: 1.5 m. Also the
treatments for chili experiments were four fertilizer and manure applications .i.e. F0 = No
fertilizer, F1= only cow dung, F2= only poultry litter and F3= only chemical fertilizer.
The total number of experimental plots for brinjal was six for okra was twelve, for sweet
gourd was nine and for chili was twelve. The experimental results showed that the
highest brinjal yield (31.45 t/ha) was recorded in brinjal sole cropping and the lowest
yield (28.45 t/ha) was recorded in mahogany + brinjal based agroforestry system. In case
of okra experiment, the highest yield (21.96 t/ha) was recorded at 160 cm distance from
the tree base and the lowest yield (15.16 t/ha) was recorded at 40 cm distance from the
tree base. In case of sweet gourd experiment, the maximum yield (11.72 t/ha) was
recorded from pit to pit spacing 2.0m and the minimum yield (9.23 t/ha) was recorded
from pit to pit spacing 1.5m. In case of chili experiment, chemical fertilizer gave the best
total yield (4.88 t/ha) and no fertilizer gave the lowest total yield (3.09 t/ha). From the
economic analysis, it was observed that the higher BCR (4.48) was recorded in
mahogany + brinjal and the lowest BCR (4.38) was recorded in sole cropping of brinjal
based agroforestry system. The higher BCR (4.17) was also recorded in okra cultivation
at 160 cm distance from the tree base and the lower BCR (2.92) was recorded at 40 cm
distance from the tree base. Again the higher BCR (3.57) was recorded in sweet gourd
cultivation at pit to pit spacing of 2.0 m. On the other hand, the lower BCR (2.09) was
recorded at pit to pit spacing of 1.5 m. In case of chili cultivation in agroforestry system,
the higher BCR (2.49) was recorded where chemical fertilizer was applied and the lower
BCR (2.20) was recorded where no fertilizer was applied. Finally, it may be concluded
that brinjal, okra, sweet gourd and chili can be cultivated successfully under newly
established mahogany and litchi based agroforestry systems at the char land ecosystem
considering the additional returns as per investment in terms of money and time. | en_US |
