Direct and residual effects of phosphoros from organic manures and single super phosphate on microbial populations and biomass carbon content in groundnut-sunflower cropping system

Abstract

Tq m i I N ct cltt A gr i ctr I ttt r a I IJ n iv er s i ty, C o i m b a t o re, I nd ia ABSTRACT polculltrre experituenls ttere conducled using cliJJ'erent phosphorus sources at Tamil Nacltt Agrictiltttrol (Jniversity:Coimbutore, cluring 2007-2008. to inprove organic carbon content ancl ti maintain a bel,er nticrobiul populati<ut in grotntlnttt (Aruc'his hypogttca L) sunflower (Helianthus annuus L) cropping system. Fotl'orgonic 'sotrrces (Ltrntyarcl tnanurc, poultry manure' vernicompost aurl srwage-rludgu) evctlualecl iu conrpurisott tvith lhe stundctrd inorganic source o.f single asis @ 31 kg P,O, hctl. The six treatments, including cr in a completely randomized design' The ntain crop oJ residttal crop of sunflower Go a) Post-harvest sctil tncl urnflrnrer. Organic monures increased lhe organic cctrbon co,len!, biotttcr.s,s cnrbon c,ottlutl urtcl tnicrobiul populution. Poultry manure significantly ittc.reusecl the nticrobittl populatiort untl biontu.s,s cctrbon conlanl in main and residual cropping thttn.s.itrgle sypper phosphote Hotyever, the nticrobiul biomass carbon content in the post-residual c,rop soil tt'us lower lhun thcrt in lhe posl-httrvc.st 'soil after rtril crop' Keylvords: Biomass carbor.r, nriclobial populatiou, organic catbott, organic manure' phosphorus so[lrce lntrod uction Orgauic rnarttlres plal a vital role itl trlaitrtetratlce of physical. cherrical and biological conditions of soil and supply lttacro and Inicrotltttriettts to crops,

Sulfur Distribution and Availability in Alkaline Subtropical Soils Affected by Organic Amendments

“…Similarly, the lower C to N and C to P ratios of the PL were also probably the reason for the rapid degradation of PL. Consequently, the MBC increased more rapidly in PL treatment as stated by Premanandarajah and Shanika (2015). The preliminary increase in MBC in the amended soils reflects the decomposition of easily degradable substrates contained in the organic amendments during the early phase of incubation.…”

“…Although the organic amendments, viz., farmyard manure, poultry litter, and sugarcane filter cake, significantly increased CO 2 -C and ΣCO 2 -C evolution from the soils, the effect of PL was more prominent than the SF and FYM amendments (Bhoi and Mishra 2012). The higher contents of total organic C, dissolved organic C, and other essential nutrients in PL might have stimulated the growth and activity of microbial populations present in the soils (Malik et al 2013) and thus resulted in increased soil respiration (Premanandarajah and Shanika 2015). The rate of CO 2 -C evolution increased in the soils immediately after the addition of organic amendments.…”

Study of Soil Microbial Population and Enzyme Activities under Jasmine Cultivation as Influenced by Nutrient Sources

“…The treatments that received RDF along with Pressmud @ 40 g sulphur/plant/year (111 x 10 6 CFU g -1 ) and RDF along with Pressmud @ 20 g sulphur/plant/year (100 x 10 6 CFU g -1 ) were found to be on par in influencing the bacterial population of soil. Improvement in the bacterial population with addition of sulphur through organic source was reported by Premanandarajah and Shanika [19]. Organic carbon (g kg -1 ) 6.2 Chemical properties Macro nutrients 7.…”