Liming induces carbon dioxide (CO2) emission in PSB inoculated alkaline soil supplemented with different phosphorus sources

Abstract

Agricultural land is a major sink of global organic carbon (C). Its suitable management is crucial for improving C sequestration and reducing soil CO emission. Incubation experiments were performed to assess the impact of phosphate solubilizing bacterial (PSB) inoculation (inoculated and uninoculated) and soil calcification (4.78, 10, 15, and 20% crushed CaCO) with phosphorus (P) sources [single superphosphate (SSP), rock phosphate (RP), farm yard manure (FYM), and poultry manure (PM)] in experiment 1 and with various rates of PM (4, 8, and 12 kg ha) in experiment 2 on cumulative soil respiration. These experiments were arranged in three factorial, complete randomize design (CRD) with three replications. Interactively, lime with P sources (at day 1 and 3) and lime with PSB (at day 1) significantly expedited soil respiration. Mainly, PSB inoculation, liming, PM fertilization, and its various rates significantly enhanced soil respiration with time over control/minimum in alkaline soil at all incubation periods. Higher CO emission was detected in soil supplemented with organic P sources (PM and FYM) than mineral sources (SSP and RP). CO emission was noted to increase with increasing PM content. Since liming intensified CO discharge from soil, therefore addition of lime to an alkaline soil should be avoided; instead, integrated approaches must be adopted for P management in alkaline calcareous soils for climate-smart agriculture.

Soil organic carbon and labile and recalcitrant carbon fractions attributed by contrasting tillage and cropping systems in old and recent alluvial soils of subtropical eastern India

“…SOM is made up of dead plant and animal residues, particulate organic carbon, humus carbon, and recalcitrant carbon which plays a crucial role in soil fertility, productivity, and overall quality of soil [ 10 , 11 ] along with balancing environmental functions [ 12 ]. Agricultural soils act as a major sink for organic carbon (C) which helps in sequestering more C and reducing soil CO 2 emission [ 13 ]. Connecting sustainable development goals (SDGs) to agriculture and the nutritional quality of food is one of the key tasks to raise crop productivity without compromising the sustainability of agricultural resources and environmental security through the build-up of SOM [ 14 ].…”

Isolation and characterization of phosphate solubilizing bacteria naturally colonizing legumes rhizosphere in Morocco

“…P mobilization in the rhizosphere is largely due to pH changes induced by roots and/or associated microorganisms and to carboxylate exudation ( Hinsinger et al, 2011 ). Soil pH is critical in determining the availability of inorganic forms of P ( Hinsinger et al, 2009 ; Adnan et al, 2018 ), and it can also influence the fate of organic P through its impact on enzymatic activities. In neutral to alkaline soils, Pi occurs largely in various forms of Ca phosphate (mainly apatites) whereas, in acidic and deeply weathered soils, such as those abundant in the tropics, much of the soil Pi occurs as bound to and/or occluded in Fe and Al oxy (hydr) oxides ( Jones and Oburger, 2011 ).…”

Analysis of Sources and Trends in Agricultural GHG Emissions from Annex I Countries

“…Lime (limestone or dolomite) is used to ameliorate soil acidity, improve soil structure, and improve plant growth in cropland and grassland [44]. However, it intensifies CO 2 discharge from soil, therefore addition of lime to an alkaline soil should be avoided [45]. Overall, its use decreases in Annex I countries over time.…”