Effect of Soil Amendments on Methane Emission and Rice Productivity nearby the Dingaputa Haor area of Netrokona District, Bangladesh

Md. Rajib Hossain, Department of Environmental Science and Disaster Management, Bangabandhu Sheikh Mujibur Rahman Science and Technology University
2019 Journal of Environmental Science and Allied Research  
An experiment was conducted nearby the Dingaputa haor area of Netrokona District during boro season. The aim of the study was to find out the most suitable soil amendment for reducing CH 4 emission and maximizing the yield attributes of BRRI dhan58. In this experiment six treatments, such as T 1 : 100% recommended dose of urea (220 kgha -1 ) , T 2 : 50% Urea+Vermicompost (4 tha -1 ), T 3 : 50% Urea+Azolla incorporated (4 tha -1 ), T 4 : 25% Urea+Azolla incorporated (4tha -1 )+ Vermicompost (4
more » ... + Vermicompost (4 tha -1 ), T 5 : 25% Urea+Azolla incorporated (6 tha -1 )+Vermicompost (2 tha -1 ), T 6 : 25% Urea+Azolla incorporated (6 tha -1 )+Azolla dual cropping (1tha -1 ) with Cyanobacterial mixture were used. At 14 DAT, CH 4 flux was very low and no significant differences were observed among the treatments. At 70 DAT, CH 4 emissions peaked in all treatments where highest peak was recorded (30.39 mgm -2 h -1 ) in treatment T 6 and the lowest was recorded (16.38 mgm -2 h -1 ) in T 2 . The highest grain yield (6.50 th -1 ) was found in the treatment T 4 while lowest grain yield (5.37 th -1 ) was found in the treatment T 3. After rice harvest the soil properties such as soil pH, total nitrogen, organic carbon, phosphorus, potassium and sulphur was found 6.94, 0.16%, 1.58%, 14.52 ppm, 0.10 meq 100g -1 and 9.65 ppm respectively. Considering all the above parameters it may be concluded that, the application of 25-50% of the recommended Urea along with Azolla incorporated (4tha -1 ) and Vermicompost (4tha -1 ) amendment could be suitable for maximizing of rice yield and reducing CH 4 emission.
doi:10.29199/2637-7063/esar.202021 fatcat:m2v5ahpi5fhdbcwjoiyjid4yg4