Dr.K.C. Roy
IWM Division, BARI, Gazipur
M.S. Islam
IWM Division, BARI, Gazipur
P.K. Sarkar
IWM Division, BARI, Gazipur
M.A.K. Mridha
An experiment was conducted to determine the irrigation scheduling of hybrid maize during the rabi season, 2001-2002 using the computer program CROPWAT. Irrigations were given at different depletions (60, 80 and 100%) of readily available moisture (RAM) as well as at 25, 50, 75 and 90 days after sowing (DAS). Besides, no irrigation treatments were also tested in the study. The treatment irrigated upto field capacity of 25, 50, 75 and 90 DAS produced the highest yield (8.04 t/ha) with 322 mm water for 4 irrigations. The treatment T6, irrigated five times at fixed interval of 25 days gave 7.99 t/ha of yield with 318 mm water application. From the study it reveals that four irrigations each at 25, 50, 75 and 90 days after sowing is the proper irrigation scheduling for the cultivation of maize.
Hybrid maize, irrigation scheduling, CROPWAT
Central farm, BARI, Gazipur
Crop-Soil-Water Management
The main objective of the study was to develop an appropriate irrigation scheduling of hybrid maize with the help of computer programme CROPWAT.
The experiment was conducted in the farm of Bangladesh Agricultural Research Institute (latitude: 24.00ON and longitude: 90.250E), Joydebpur during the rabi season of 2001-2002 with BARI hybrid maize-1. The texture of the soil was clay loam. Field capacity and wilting point of the soil were 28 percent and 14 percent by weidght bases, respectively. The bulk density and PH of the soil were 1.5 g/cc and 6.44, respectively. Randomized Complete Block Design (RCBD) with three replications was used. Total available soil moisture was 175 mm per meter depth of soil. Maximum infiltration rate was 30mm per day. Initial soil moisture depletion was 43 percent of the total available soil moisture. Fertilizer application rates were 250, 125, 130, 40 and 4 of N, P2O5, K2O5, S and ZnO, respectively. The whole of P, K. S. Zn and half of N were applied during the final land preparation. The rest of N in the form of urea was applied immediately after the first three consecutive irrigations. The size of each plot was 3m x 4m. Row to row spacing was 75 cm and plant to plant spacing was 25 cm having one plant in a hill.
The experiment had the following treatments:
T1= no irrigation
T2= Irrigation up to field capacity (FC) at 25, 50, 75, and 90 days after sowing (DAS)
T3= Irrigation up to FC at 60% depletion of readily available soil moisture (RAM)
T4= Irrigation up to FC at 80% depletion of readily available soil moisture (RAM)
T5= Irrigation up to FC at 100% depletion of readily available soil moisture (RAM)
T6= Irrigation at fixed interval of 25 days.
Annual Research Report 2001-2002, IWM Division, BARI, Gazipur
The highest amount of irrigation water (321.5 mm) was consumed by the treatment T2 followed by the treatment T6 (318.1 mm) and then T5 (241.0 mm). Amount of irrigation water for different treatments varied widely from 241.0 mm to 321.5 mm. However, the yield of maize did not vary as per the quantity of irrigation water. This might happen due to early frequent rains during this season that influenced crop growth.
Report/Proceedings