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After 17 years crops cycles, lower bulk density was found from raised bed over conventional from different depth, increased infiltration rate and total pore space in raised bed systems over conventional method due to create loose with microbia activites intobed with increase soil microorganisms.

Findings

Permanent bed systems with 30% residue retention both from wheat and rice and full residue retention from mungbean crop were found higher productivity over conventional practice with 0% residue retention. Less global warming potential was found from direct seeded rice and wheat under raised bed system and more in conventional both puddle transplanted rice, compared to the conventional practice. All resource conservation technologies reduced the global warming potential by 13-37%. 0.72% organic matter increased after seventeen years’ crop cycles for 30% residue retention from wheat and rice and full residue retained from mungbean crops. It saved 23, 25 & 29 % water under PRB with 30% residue retention from rice-wheat– mungbean cropping pattern. PRB with 30% SR saved 42 litre/ha/year fuels with 44% less CO₂ emission in the atmosphere in rice-wheat-mungbean system.

Conclusions

30% residue retention from wheat and rice and full residue retained from mungbean crops under permanent beds were the best combination for getting higher productivity as well as improve soil fertility. Saved 30% water with less 44% CO₂ emission resource conserving technologies from all three crops. 0.72% organic matter increased after twelve years’ crop cycle with30% straw retention from both wheat and rice and full residue retained from mungbean crops. Compared with all treatments, the raised bed system with 30% residue retained appears to be a very promising technology for sustainable intensification of RW systems in Bangladesh

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Ilias Hossain,Golam Faruq,Abdul Hakim,Shahidul Alam

FOOD SECURITY WITH SAVING NATURAL RESOURCES THROUGH CLIMATE SMART CONSERVATION TECHNOLOGIES UNDER CHANGING CLIMATE IN BANGLADESH

JLES-Vol-16-No-P-63-68, December 2021.

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