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Soil organic carbon pools and productivity in relation to nutrient management in a 20-year-old rice–berseem agroecosystem

Soil organic carbon pools and productivity in relation to nutrient management in a 20-year-old rice–berseem agroecosystem,10.1007/s00374-007-0226-6,Bi

Soil organic carbon pools and productivity in relation to nutrient management in a 20-year-old rice–berseem agroecosystem   (Citations: 3)
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Labile fractions of soil organic C (SOC) can respond rapidly to changes in C supply and are considered to be important indicators of soil quality. An attempt is made in this paper to investigate into the dynamics of total organic C (C tot), oxidisable organic C (C oc), very labile C (C frac 1), labile C (C frac 2), less labile C (C frac 3), non-labile C (C frac 4), microbial biomass C (C mic), mineralizable C (C min) and particulate organic C (C p) in relation to the system productivity of a 20-year-old rice (Oryza sativa L)–berseem (Trifolium alexandrium L) cropping system with different management strategies [no fertilization, only NPK and NPK + FYM (farmyard manure) applied in different seasons] in the hot humid, subtropics of India. Cultivation over the years caused a net decrease, while balanced fertilization with NPK maintained the SOC. About 62% of the C applied as FYM was stabilized into SOC. The passive pool (C frac 3 + C frac 4) constituted about 55% of the C tot. A larger proportion (63%) of applied C was stabilized in the passive pool of SOC. Of the analysed pools, C frac 1, C mic, C p and C min were influenced most by the treatments imposed and explained higher per cent variability in the yield of the crops.
Journal: Biology and Fertility of Soils - BIOL FERT SOILS , vol. 44, no. 3, pp. 451-461, 2008
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    • ...Majumder et al. (2008c) obtained a pretty good correlation between the first C pool (very lable pool or Pool I) and the mineralizable C (r=0.96, P<0.05) in the plots under a 20year-old rice-berseem agroecosystem under tropical...
    • ...Majumder et al. (2008c) also observed about 45% of SOC present in the recalcitrant pools under subtropical climatic conditions in a 20 year old riceberseem (Trifolium alexandrinum L.) agroecosystem...
    • ...Majumder et al. (2008c) explained that variations in the rate of decomposition of crop residue-C in soils under different climatic conditions might be responsible for such differences in the magnitude of the pools...

    Ranjan Bhattacharyyaet al. Long term fertilization effects on soil organic carbon pools in a sand...

    • ...At the same time, this pool of SOC fuels the soil food web and therefore greatly influences nutrient cycling for maintaining soil quality and its productivity (Chan et al. 2001; Majumder et al. 2008a, b). On the other hand, stabilized fraction is composed of organic materials that are highly resistant to microbial decomposition and hardly serves as a good indicator for assessing soil quality and productivity (Weil et al. 2003; Sherrod et ...
    • ... time, this pool of SOC fuels the soil food web and therefore greatly influences nutrient cycling for maintaining soil quality and its productivity (Chan et al. 2001; Majumder et al. 2008a, b). On the other hand, stabilized fraction is composed of organic materials that are highly resistant to microbial decomposition and hardly serves as a good indicator for assessing soil quality and productivity (Weil et al. 2003; Sherrod et al. 2005; ...
    • ... stabilized fraction is composed of organic materials that are highly resistant to microbial decomposition and hardly serves as a good indicator for assessing soil quality and productivity (Weil et al. 2003; Sherrod et al. 2005; Majumder et al. 2008a, b). Cropping systems and management practices that ensure greater amount of crop residue (CR) to be returned to the soil are expected to cause a net buildup of SOC stock (Kaur et al. 2008; ...
    • ...Barring a few recent reports under tropical environments (Banerjee et al. 2006; Rudrappa et al. 2006; Majumder et al. 2008a, b ;K aur et al. 2008; Mandal et al. 2008), majority of the studies related to soil organic carbon dynamics under different agricultural management practices and land uses are confined to temperate region (Mandal et al. 2008), where SOC content is generally much higher than tropical Indian soils...
    • ...Superiority of FYM in increasing the WBC content in soils was also reported earlier (Singh et al. 2000; Majumder et al. 2008a)...

    Bibhash C. Vermaet al. Monitoring changes in soil organic carbon pools, nitrogen, phosphorus,...

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