Abstract
An experiment was conducted at Bangladesh Institute of Nuclear Agriculture (BINA) farm, Mymensingh, Bangladesh during 2010-2011 to find out the effect of different water and organic residue rates on rice and soil. Organic carbon rates from cow dung (0.5, 1.0, 1.5 and 2.0 t C ha-1 including control) were evaluated under alternate wetting and drying (AWD) and continuous flooding (CF). CF system in combination with chemical fertilizers and 2.0 t C ha-1 produced the maximum plant height, filled grains tiller-1, 1000 grains weight, grain and straw yields. Combined use of 2.0 t C ha-1 cow dung and CF system decreased CO2-C gas emission, increased carbon accumulation in above ground biomass of rice as well as carbon sequestration in soil. This treatment also helped to optimize soil pH. Based on these results, it may be concluded that continuous flooding system in combination 2.0 t C ha-1 increased grain yield, carbon accumulation in above ground biomass, carbon sequestration in soil and optimized soil pH.Int. J. Agril. Res. Innov. & Tech. 6 (1): 26-33, June, 2016
Highlights
Rice is the staple food for more than half of the world population
Maximum carbon accumulation was found in continuous flooding system in 2011
Mean increase of carbon sequestration (449%) in soil was found in continuous flooding system against AWD system
Summary
Rice is the staple food for more than half of the world population. About four-fifths of the world’s rice is produced by small-scale farmers in developing countries. Before Green Revolution, farmer’s of rice based countries cultivate low input crop varieties for their food production and cropping intensity was very low as a result, soil quality such as organic matter and essential plant nutrients reserve didn’t affect by the above mentioned practices. Now-a-days, farmers’ use high input modern crop varieties with little or no use of organic residues for their crop production. In these consequences the highest depletion of soil carbon has been observed in soils of rice growing countries like Bangladesh (Ali et al, 1997). Pot experiment was conducted to find out the effective dose of cow dung in combination with recommended doses of Hossain (2016)
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