EFFECT OF COMBINED APPLICATION OF INORGANIC FERTILIZERS AND VERMICOMPOST ON GROWTH, YIELD, CHEMICAL COMPOSITION AND OIL CONTENT OF RAPESEED (Brassica campestris var. SAU sharisha-1)

Abstract

A held experiment was conducted at Sher-e-Rangla Agricultural University Farm. Dhaka 1207 during the Rabi season of 2007-2008 to study the eflect of combined application of inorganic fertilizers and vermicompost on growth. yield, chemical composition and oil content of rapeseed (Brassicci campesiris var. SAU Sharisha- I). The experimental soil was clay loam in texture having pH of 6.2. The treatments used were 4 levels of each of vermieomposts viz. V 0 (01 ha"), V 1 (2 t ha"). V 2 (4 t ha1),V3 (6 t ha") and chemical fertilizers (N. P. K. S. Zn. B) vit F0= ( 0-0-0- 0-0-0kg ha" ). F, = low fertilizer (45 - 15-20 - 12 -. 1.5 - 1.0 kg ha 1 ), F 2 medium fertilizer (90-30-40 25 -. 3 -2 kg ha"), F 3 high fertilizer (135-45 -60-40 - 4.5 -- 3.0 kg ha 4 ) in 16 treatment combinations with 3 replications. The resulls demonstrated that the increasing doses of vermicompost and chemical fertilizers increased grain and straw yields of rapeseed significantly. The maximum significant grain yi eld was obtained with the treatment combination. V 2F2 and that of straw yield was obtained with the treatment combination. V 3F3. The highest doses of vermicompost and chemical fertilizers increased N. P. K. and S concentrations in rapeseed plant significantly and also enhanced N, P, K and S uptake significantly at the harvesting stage. The maximum significant N. P and K uptake by rapeseed grain were obtained with the treatment combination, V 2F2 and S uptake was obtained with the treatment combination, V 3F3 . Application of chemical fertilizers failed to increase organic matter content of post harvest soil, whereas vennicomposts showed a significant positive efiCet. Vermicompost and chemical fertilizers increased P. S and Zn. B status significantly and that of N and K appreciably in the soil under study. The oil content was not significantly influenced by the different treatments.