Abstract
The effects of conservation agriculture (CA) practices on soil properties along with crop yields of rice-based triple cropping systems have not been adequately assessed in Bangladesh. An experiment was conducted at Bangladesh Agricultural Research Institute, Gazipur, Bangladesh from 2009 to 2012 to assess the effects of tillage practices and crop residue retention on soil physical properties, soil organic carbon (SOC) and crop yields in a wheat-mungbean-rice system. Treatments consisted of three tillage practices (MT: minimum tillage; CT: conventional tillage and DT: deep tillage) and eight levels of crop residue management (S0—no residues retention, Sr—retention of 30 cm rice straw, Sm—whole mungbean stover retention, SW—30 cm wheat straw retention, Smr—whole mungbean stover & 30 cm rice straw retention, Srw—30 cm rice & wheat straw retention, Smw—whole mungbean stover & 30 cm wheat straw retention and Swrm—30 cm wheat and rice straw along with whole mungbean stover retention) were applied in split plot design with three replications. Bulk density (BD) and porosity responded positively to MT and increased residue retention of all crops (p > 0.05). Minimum tillage and Swrm also significantly accumulated SOC (p < 0.05; 0.38% higher than DT with no residue retention) and retained soil moisture (p < 0.05). Minimum tillage practice performed better in upland crops (p < 0.05; wheat & mungbean yields) and CT outperformed MT in wetland rice crop (p < 0.05). The grain and straw yields of wheat and rice were also influenced by previous crop residue retentions (p < 0.05). The results, therefore, suggested that increased residue retention with minimum tillage practices improved soil properties and yield of upland crops but with deeper tillage practices consistently maintained wetland rice production.
Highlights
Tillage has both advantageous and unfavorable effects on soil physico-chemical properties and on climate change [1]
An experiment was conducted at Bangladesh Agricultural Research Institute, Gazipur, Bangladesh from 2009 to 2012 to assess the effects of tillage practices and crop residue retention on soil physical properties, soil organic carbon (SOC) and crop yields in a wheat-mungbeanrice system
For that reason, the optimum combination of tillage practices and crop residue retention levels for higher crop yield and soil health? the effects of tillage practices and crop residue retention on soil physical properties, SOC content along with crop yields under wheat-mungbean-rice cropping system have not been adequately assessed in Bangladesh [2]
Summary
Tillage has both advantageous and unfavorable effects on soil physico-chemical properties and on climate change [1]. Though the benefits of SOC sequestration to sustaining crop productivity by following minimum disturbance of soil [2] [15] along with applying organic amendments and crop residues and including leguminous crops in the cropping systems have been well documented in other parts of South and Southeast Asia [10] [11] [14], very few studies have been conducted in the rice based triple cropping systems of Bangladesh of subtropical humid climate in this regard. The effects of tillage practices and crop residue retention on soil physical properties, SOC content along with crop yields under wheat-mungbean-rice cropping system have not been adequately assessed in Bangladesh [2]. The present study was undertaken to assess the effects of tillage practices and crop residue retention on soil physical properties, SOC content and crop yields under wheat-mungbean-rice cropping system
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