Monday, February 3, 2020

CARBON SEQUESTRATION AND ASSESSMENT OF CARBON INPUT THROUGH POTATO-MAIZE-T.AMAN CROPPING PATTERN IN BANGLADESH




M.A.K Mian, A.A. Begum and R.R. Saha


Agronomy Division

Bangladesh Agricultural Research Institute, Gazipur 1701



Abstract


The experiment was conducted at Agronomy Research field in 2017-2019. Treatment were viz. T1=Full residue of potato, maize and 1/3 of rice + 100% recommended fertilizer dose (RFD) of T.aman, T2=Full residue of potato, maize and 1/3 of rice + 80% RFD of T.aman, T3=Full residue of potato, maize and 1/3 of rice + 60% RFD of T.aman, T4=Residue removed + 100% RFD of T.aman, T5=Control (Without crop residue and fertilizer). Potato tuber yield was higher in all treatments (18.06-19.88 t/ha) except T5 (8.85 t/ha). Grain yield of maize was the highest in T1-T4 treatments (4.25-4.53 t/ha). The highest grain yield of rice was obtained from control treatment (T5) (3.76 t/ha) but the lowest in T4 (2.25 t/ha). Total organic C input from Potato-Maize–T. aman rice cropping pattern was noticed higher value in T1 (10.66 t/ha) but the lowest in T5 (6.57 t/ha). The highest total organic C adding from the pattern was estimated from T1 (4.70 t/ha) but the lowest in control T5 (0.58 t/ha). Treatments, T1, T2 and T3 showed positive balance of organic C in soil while T1 showed the highest value (0.11%). The C sequestration was estimated the highest in T1 (3.83 t/ha) while T4 and T5 showed negative values. The results expressed that addition of crop residues as well as organic C in soil enhanced C balance or C sequestration in soil. Treatments, T1, T2 and T3 showed positive balance of total N in soil while T1 showed the highest value (0.028%). Negative balance of total N in soil was noticed in T4 and T5. Addition of crop residues enhanced slightly positive balance of total N in soil. Total carbon input (average of four year from 2014-2015 to 2017-2018) was estimated at 17.1659 million ton/year through potato- maize-T.aman rice cropping pattern in Bangladesh

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