No abstract

not available DOI: http://dx.doi.org/10.3329/bjsr.v26i1-2.20236 Bangladesh J. Sci. Res. 26(1-2): 89-93, December-2013

No abstract

No abstract

No abstract

No abstract

Local level calibration of crop coefficient (K c ) values is critical for regional level planning and allocation of water resources for irrigation. In this regard, an experiment was conducted at the Irrigation and Water Management Division of Bangladesh Agricultural Research Institute (BARI), Gazipur, in order to estimate crop coefficient values of soybean under the local climatic condition. An improved crop variety-BARI Soybean-6 was used in this experiment. The crop was grown under four irrigation treatments, allowing irrigation at an interval of 10, 15, 20 and 25 days. The treatments were so designed that drainage was allowed between the consecutive irrigations. Irrigation at 15 days interval produced the highest seed yield of 1.26 t/ha and was considered to be suitable for estimating seasonal crop evapotranspiration (ET c ) and K c values. The seasonal highest cumulative ET c was 308.43 mm under this treatment. The K c values of soybean at initial, development, mid-season and late season stages were found as 0.67, 1.46, 1.59 and 0.62, respectively.

Field experiment was conducted during two consecutive years (2011-12 and 2012-13) to investigate the yield and water productivity (WP) of mustard (BARI Sarisha-14 variety) using sprinkler irrigation. There were six irrigation treatments (sprinkler irrigation at vegetative (T 1 ), pre-flowering (T 2 ) and pod formation (T 3 ) stage, sprinkler irrigation at vegetative and pod formation stage (T 4 ), sprinkler irrigation at pre-flowering and pod formation stage (T 5 ); and basin irrigation at vegetative, pre-flowering, and pod formation stage (T 6 ) (farmer's practice). Results indicate that yield and yield components responded positively against different soil moisture regime. The significant highest yield (1.41 and 1.37 t/ha) was obtained by applying basin irrigation at three growth stages, with no statistical difference in yield (1.38 and 1.34 t/ha) with the application of sprinkler irrigation at vegetative and pod formation stages. Vegetative stage was the most critical stage to sprinkler irrigation and pod formation is the next most sensitive stage for mustard cultivation. Sprinkler irrigation can save more than 65 and 35 % of water with the yield reduction of 12.96 and 2.16%, respectively, in treatment T 1 and T 4 compared to treatment T 6 . These treatments (T 1 and T 4 ) also gave higher water productivity, irrigation water productivity, and net revenue than treatment T 6 . The results will be helpful for policy planning regarding efficient irrigation and water management under water scarce situation.