ABSTRACT

A field experiment was conducted at the Banglabazar field area near Pabna town during the period from
05 February 2016 to 25 May 2016 to observe the performance (growth and yield) of kangkong and sweet
gourd grown at different distances from the lohakat tree (Xylia sp.). Different treatments of the experiment
were T1 (3 feet distance from tree), T2 (6 feet distance from tree) and T3 (9 feet distance from tree) T4 (open
field referred as control). The experiment was laid out in RCBD for all six crops with 3 replications. In case
of sweet gourd, it was found that open field produced highest yields (40.30 t ha -1) which were statistically
similar to treatment T3. In case of kangkong, it was also found that treatment T3 (9 feet distance from tree)
produced highest yields (39.20 t ha -1
) which were statistically similar to treatment T4 (open field referred as
control). In case of sweet gourd and kangkong, the lowest yield was found in T1(3 feet distance from the
tree). The growth characters of lohakat tree (Xylia dolabriformis) tree are not satisfactory in association with
kangkong and sweet gourd at 9 feet distance from lohakat tree (Xylia dolabriformis) tree.
Key words: Performance, kangkong, vegetables, agroforestry.
Introduction
In Bangladesh, a large number of vegetable are grown throughout the year including summer season. About
30 per cent of vegetable are produced in summer and rainy seasons. The average consumption of vegetable
in Bangladesh is only 70 g per head per day including potato and sweet potato. To supply the minimum
daily requirement of 200g vegetable head day-1, national production of vegetable should be over 10 million
ton in addition. The effective area of forest in Bangladesh is neither in a position to fulfill the requirements
of the people’s fuel and timber nor to stabilize the climatic condition. So, conflict for land use between
agriculture and forestry are prevalent in Bangladesh. Under these circumstances it is necessary to find out a
suitable alternative to overcome this situation. Recently, some techniques have already been advocated to
overcome future food challenges, vegetable agroforestry is one of them. The integration of tree and crop or
vegetable on the same area of land is a promising production system for maximizing yield and maintaining
friendly environment (Nair, 1990). In Bangladesh; different crops are cultivated in summer season. Among
the different summer vegetables okra and bottle gourd are the important summer vegetables in Bangladesh.
These are well known and very popular vegetables grown successfully during summer season in
Bangladesh. For identifying the compatible tree-crop combination, particularly under storey species i.e.
different crops should be screened out in terms of their adaptability and yield in association with the early
stage of tree. Therefore, it would be wise to conduct experiments under different tree crop or vegetable
combination at different spacing for screening of different crops in terms of their growth and yield
performance. The specific objectives of the study were to observe the performance of kangkong and sweet
gourd in association with lohakat tree tree and to observe their interaction.
Materials and Methods
The study was made to evaluate the performance of vegetables in association with four years old lohakat
tree. The soil of the experimental area was a medium high land. The texture of the soil was silty loam
having pH 6.7 (Amir and Bhuiya, 1994). The topography of the field was medium high land above flood.