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.
