M. S. Rahman
Scientific Officer
IWM Division, BARI Gazipur
M. M. Rohman
Senior Scientific Officer
Plant Breeding Division, BARI
P. K. Sarkar
Principal Scientific Officer
IWM Division, BARI Gazipur
M. A. R. Akanda
Principal Scientific Officer
SRC, Bogra, BARI
M. R. Molla
Scientific Officer
IWM Division, BARI Gazipur
In this study, twenty five maize genotypes (CZ 3, CZ 10, CZ 12, CZ 19, CZ 24, CZ 26, CZ 27, CZ 28, CZ 29, CZ 30, CZ 31, CZ 32, CZ 33, CZ 35, CZ 36, CZ 37, CML 159, CML 206-1, CML 216, CML 251, CML 376-1, CML 395, CML 456, CML 470 and CML 496) were tested for their salt tolerance at different degree of soil salinity: 4 dS/m (T2), 8 dS/m (T3 ), 12 dS/m (T4) and16 dS/m (T5). A non saline treatment (T1) was undertaken as a control. The survivality, growth and yield of the genotypes are gradually decreased by increasing soil salinity. All maize genotypes were found to be salt tolerant at 4 dS/m salinity level and yields were more or less similar to non saline treatment. Some maize genotypes (CZ 28, CZ 29, CZ 33 and CZ36) were found to be high salt tolerant (up to16 dS/m) though the yields were lower than that of non-saline treatment.
Maize genotypes, salt tolerance, soil salinity, survivality
Central farm, IWM Division, BARI, Joydebpur, Gazipur
Crop-Soil-Water Management
The objectives were: (i) to screen the maize genotypes against different levels of soil salinity and (ii) to evaluate the effectiveness of saline water irrigation
The experiment was conducted in the poly of research field in Irrigation and Water Management Division, Bangladesh Agricultural Research Institute (24°0´ N, 90°25´ E, and 100 m above mean sea level). Twenty five maize genotypes were tested under this experiment. The seeds of maize genotypes were sown in the plastic pots (28 cm x 35 cm) on 2 January 2011. Before sowing the pots were irrigated 3 times up to field capacity by using saline water (4 dS/m) allowing sufficient drainage to keep the soil in the pots to approximately 3 dS/m salinity level. Each treatment was replicated twice and the following treatments were selected:
T1 = Fresh water irrigation (control)
T2 = Saline water irrigation at 4 dS/m
T3 = Saline water irrigation at 8 dS/m
T4 = Saline water irrigation at 12 dS/m
T5 = Saline water irrigation at 16 dS/m
Irrigation water was prepared artificially with desired salinity level by the solution of NaCl and CaCl salt at a ratio of 5:1 in water using error and trial method in the laboratory. Irrigations were applied to the plants through drip irrigation system. Six saline water irrigations of each salinity level (4, 8, 12, 16 dS/m) were applied in the treatments to maintain the required salinity level in pots during the crop season. Standard fertilizer doses were applied in each pot. Irrigations were applied six times to each of the treatment (T3, T4, T5) and these were: 30 days after sowing (DAS), 50 DAS, 60 DAS, 70 DAS, 90 DAS and 110 DAS. In case of treatment T2, Irrigations were applied at 30 days after sowing (DAS), 50 DAS, 70 DAS, 90 DAS and 110 DAS. On the other hand, four fresh irrigations at 30 DAS, 50 DAS, 75 DAS and 100 DAS were applied in T1 (control).
BARI Annual Research Report 2010-2011
As an overall trend, the survivality, growth and yield of all the tested maize genotypes decreased as the salinity level increased. A few numbers of maize genotypes (CZ 28, CZ 29, CZ 33 and CZ36) were found to be high salt tolerant at 16 dS/m though the yield were lower than that of non-saline environment. As this the first year study, it needs to be continued further for confirmation the results especially on 16 dS/m soil salinity level.