Abstract:
A held experiment was conducted at the Shcr-e-Bangla Agricultural University
Farm, Dhaka 1207 during the summer season of 2007 to study the effect of
"Combined application of vermicompost and fertilizers (NPKS) on the yield of
summer onion". The experimental soil was silty clay loam in texture having pFI
of 6.0. The treatments were 4 levels of vermicompost viz, V0 (0 t ha4). V, (1.5
I ha4), V, (3 t ha4).V3 (5 t haS'). and 3 levels of chemical fertilizers, viz. F0 =
No NPKS (0-0-0-0 kg ha'). F1 = Ilali the recommended dose of NPKS (60-22
50-16 kg ha4), F2 = Full recommended dose of NPKS (120-44-100-32 kg ha')
in 12 treatment combinations and 3 replications. The results demonstrated that
the increasing doses of vermicompost and chemical fertilizers in combination
increased bulb yield of summer onion significantly. The maximum significant
bulb yield was obtained with the treatment combinations of V3F1 (Nigh vermicompost + Medium NPKS) or \'2F2 (Mediuni vermicompost -I- 1-ugh
NPKS). The highest doses of vermicompost and chemical fertilizers increased
N, P. K and S concentrations in summer onion plant and bulb significantly at
the hervesting stage. Application of chemical fertilizers failed to increase
organic matter content of post harvest soil, whereas vermicompost showed a
significant positive effect. Combined appLication of vermicompost and
chemical fertilizers increased the level of NPKS and organic matter status of
soil significantly. Application of vermicompost and chemical fertilizers in
combination prevents the development of acidity in the postharvest soil.
Description:
A thesis Submitted to the Department of Soil Science Sher-e-Bangla Agricultural University, Dhaka In partial flit flhlment of the requirements for the degree of
MASTER OF SCIENCE (MS) IN SOIL SCIENCE
SEMESTER: JULY-DECEMBER, 2007
