RESIDUAL EFFECT OF MUNICIPAL SOLID WASTE COMPOST ON MICROBIAL BIOMASS AND ACTIVITIES IN MUSTARD GROWING SOIL

摘要

Residual effect of municipal solid waste compost (MSWC) on microbial biomass and enzyme activities of mustard after submerged rice paddies was studied. Experiments were conducted during the two consecutive winter seasons of 1997 to 1998 on m ustard grown at the Agriculture experimental Farm, Calcutta University. Baruipur, West Bengal, India. The treatments consisted of control, no input and MSWC. at 60 Kg N;ha and well rotted cow dung manure (COM), at 60 Kg N 'ha and MSWC (30 Kg N.'ha) + Urea (U, 30Kg N/ha) and CDM (30 Kg N/ha)~(-1) U (30 Kg N ha) and F (at recommended dose at 60:30:30 NPK/ha through urea, single super phosphate and muriate of potash respectively). Soil microbial biomass-C (MBC), urease (UR) and acid phosphatase (Al') activities were higher in CDM than MSWC-treated soils, due to the qualitative differences between the two materials. The sludied parameters were higher when urea was integrated with CDM or MSWC' than when applied singly. The MBC, UR and AP activities of soil periodically declined up lo day 60, and then increased after harvest. The appreciable amounts of heavy metals in MSWC produced no evidence of any detrimental influence on MBC, UR and AP activities of soil. This indicated the suitability of MSWC as an alternate source of organic mailer in mustard.