Emission of carbon dioxide influenced by nitrogen and water levels from soil incubated straw

Abstract

An incubation study was carried out to investigate the influence of nitrogen rates to determine optimum C/N ratio under various moisture levels for straw decomposition and sequester carbon (C) in the soil. The aim was to observe straw carbon mineralization through measuring the amount of CO 2 evolution. A clay loam topsoil mixed with maize straw was supplied with four nitrogen rates (0.04, 0.08, 0.16, 0.32 g N/kg) using (NH 4 ) 2 SO 4 to adjust C/N ratios at 82, 42, 20, and 10. Soil moisture was maintained at 55%, 70%, 85%, and 100% of field capacity incubated at 25°C for 53 days. The experiment was set up with 16 treatments arranged in complete randomized design. Results showed that mixing of straw with soil increased 50% cumulative CO 2 -C compared to controls. Averagely, about 44% of added maize straw C was mineralized to CO 2 -C. Straw addition along with nitrogen and moisture had significant relationships (P < 0.05) to cumulative CO 2 -C, soil organic C and microbial biomass C. There was a highly significant relationship (R 2 = 0.99) between CO 2 -C emission and incubation time.

Nitrous Oxide and Carbon Dioxide Emissions From Paddy Soil Treated With Rice Husk Products at Different Moisture Contents in a Short-Term Experiment

“…The highest CO2 emission in RR was correlated with its highest water-extractable TOC content (Table 2). Our results on the effect of raw rice husk addition on greenhouse gas emissions was in agreement with previous studies 5)8) 13) . Lou et al (2007) 5) conducted an incubation experiment with rice straw and roots at 60% WHC.…”

“…Nitrous oxide and CO2 emissions were evaluated from soil treated with different types of crop residues 5)7)8)12) or their products char or ash 11) . Soil moisture governed the decomposition of crop residues added to the soil, which in turn affected greenhouse gas emissions 13) . Identifying suitable management practices for addition of crop residues and moisture content are strongly required to increase soil fertility and crop yields while mitigating greenhouse gas emissions from agricultural soil.…”

Carbon footprint of lentil in old Brahmaputra floodplain soil

“…In addition, N 2 O has a GWP of 298 times higher than that of CO 2 (time scale 100 y) (IPCC, 2007). In addition, N fertilizers increase the decomposition rate of organic matter (Abro et al 2011, Potthoff et al 2005, Chen et al 2007) which ultimately boost up CO 2 emission (Abro et al 2011). This result was similar to Yan and Yang (2010) who the total emission from ontributed by N fertilizer use.…”

“…This result was similar to Yan and Yang (2010) who the total emission from ontributed by N fertilizer use. Application of N fertilizer induced N 2 Oemission under dry land condition resulting higher GHG O has a GWP of 298 times time scale 100 y) (IPCC, In addition, N fertilizers increase the decomposition rate of organic matter (Abro et al 2011, Potthoff et al 2005, Chen et al 2007) which emission (Abro et al 2011). …”

Influence of microbial inoculants on soil response to properties with and without straw under different temperature regimes

“…Some are used for livestock, industry while rest is discarded or burnt causing serious environmental implication as CO 2 emission. Field incorporation of straw after mechanized harvest is being promoted to enhance SOM levels, regulate C, supply nutrients, and improves soil quality and reduced C release to atmosphere (Abro et al, 2011). Microbial interaction of specific microorganisms (cellulolytic and lignolytic) with soil and crop residue may be considered as an appropriate strategy for effective decomposition of added substrate.…”