| dc.description | In Bangladesh, agriculture is the main stay of the people. Bangladesh ts-cattéd a land
of river which is the second largest river based country of the world. About 700 small
and large rivers have been flowed through this country. The Padma, the Meghna, the
Jamuna the Karnafully etc. are the main and large rivers of Bangladesh. In the rainy
season these rivers become flooded due to heavy rainfall in Bangladesh and entrance
of huge amount of water from neighbouring countries such as India and Mayanmer. In
such a condition these rivers become very terrific. They washed away all things and
break away the cultivable land and bank of the river. As a result the cultivable land is
decreasing at an alarming rate. On the other hand, the area occupied by river is
increasing very quickly. But all these rivers are filled with sand due to flooding in
rainy season. This sandy area is generally called sandbar area and the total sandbar
area of Bangladesh is increasing. In dry season, this large area appear as char land due
to lack of water. It is generally included in non-cultivable land and no crops are grown
here due to lack of soil fertility, soil nutrient and soil microbial activity. It is totally
different from normal cultivable soil. So a large portion of total area of Bangladesh is
remaining useless or unproductive. | en_US |
| dc.description.abstract | An experiment was carried out to investigate the growth and yield of pumpkin
(Cucurbita maxima), soil properties, fungi and nematode population in the temporary
typical practice of compost incorporation sandbar pit at the Tista riverside of
Rangpur area of Bangladesh during 2011-12. In the study, temporary formed sandbar
was used which was amended with compost at varying rates viz. 0, 4, 6, 8, 10, 12,
and 14 kg /pit (60-75x60-75 cm’). Data were recorded on growth parameters viz.
length of vine, leaves per plant, total number of vines per plant, male and female
flowers per pit, fruit sets per pit at 50, 80, 110 days after sowing (DAS), yield (once
at the end) of pumpkin, chemical properties of soil, fungal population at 30, 60, 90
and 120 DAS and nematode population at 60 DAS. The role of compost on growth
and yield of pumpkin revealed and found positive statistical relationship.
Incorporation of 14 kg/pit compost showed the highest growth (number of leaf, vine,
male and female flowers fruit sets), yield, chemical properties, fungal and nematode
population which was statistically at par with 12 kg compost /pit. Soil temperature
(21-32.87°C), p' (5.85-7.35), organic matter (0.09-2.43%), TN (0.01-0.19%), P
(72.63-231.90ppm), K (0.10-0.95 me/100g), S (40.69-96.79ppm), B (0.00-0.98ppm)
and Zinc (4.34-23.46ppm) were determined as well as fungus propagules (18.1 /g
soil) and nematode populations (Nematode 00-10.66/25g soil) were isolated from
114 kg compost pit. Altogether, five fungal genera in which three genera belonged to
Deuteromycotina (Fusarium, Aspergillus and Penicillium) and two Zygomycotna
(Rhizopus and Mucor) were found by soil washing, dilution plate and direct plating
methods in different treatments, but Fusarium (Conidia 0.00-21.33 / 10g) was the
dominant one. There were positive correlation between fungal propagules (conidia
0.00-21.33 and fungal hyphae 0.00-18.00 per 10g soil) and nematode population
(10.66/25g soil) with soil properties (p", organic matter, TN and P). The 12 kg /pit
compost resulted highest yield (22.20 t/ha). Finally, it is concluded that 12 kg
compost /pit resulted statistically higher yield, chemical properties, fungal and
nematode population in non-residue sandbar pit ecosystem. | en_US |
