P. K. Sarkar
Principal Scientific Officer
IWM Division, BARI, Gazipur-1701
A. J. Mila
Scientific Officer
IWM Division, BARI, Gazipur-1701
A. Khatun
Principal Scientific Officer
IWM Division, BARI, Gazipur-1701
S. Pervin
Scientific Officer
IWM Division, BARI, Gazipur-1701
The study was carried out in the experimental field of the Irrigation and Water Management Division, BARI, Gazipur with a view to evaluate the interactive impact of irrigation and fertilizer on wheat (cv. Pradip) cultivated on raised bed. Irrigation scheduling based on pan evaporation was not found very effective in comparison to the recommended interval based irrigation scheduling. Comparatively more irrigation water was required for this method without increasing grain yield. The highest grain yield (4.93 t/ha) was obtained from the treatment irrigated thrice at three growth sensitive stages with an optimum fertilizers dose. One irrigation at the most critical growth stage (17-21 DAS) was found very effective in respect of water productivity. Reduced fertilizer doses gradually decreased the grain yields in all cases.
Irrigation, fertilizer dose, interactive impact, pan evaporation, wheat
Experimental field of the IWM Division, BARI, Gazipur
Crop-Soil-Water Management
The objectives of the study were (i) to investigate the advantages of cultivating wheat in raised bed, (ii) to determine the effect of fertilizer and amount of irrigation water on grain yield and (iii) to predict an economically profitable method for wheat cultivation.
The study was conducted during the rabi season of 2011-12 at experimental field of the IWM Division, BARI, Gazipur. Soil samples were collected from 0 - 60 cm depth of the experimental plots randomly to determine soil moisture, bulk density and field capacity during sowing by oven dry method. The field experiment was laid out in a split-plot arrangement and replicated thrice. The unit plot size was 5 m x 4 m. The standard design of the bed is such that, the distance between the two furrows was 65 cm and the top width of the bed is approximately 30 cm. Line to line space on the top of the bed is 20 cm having a 5 cm space between the line and the edge of the bed. Approximate furrow depth is 15-20 cm. Irrigation schedule was taken to confirm with BARI recommended irrigation in the experimental plots. The treatment combination comprised of 3 levels of irrigation during wheat growth stages as I1 (17-21 DAS), I2 (17-21 DAS + 45-50 DAS) and I3 (17-21 DAS + 45-50 DAS + 75-80 DAS). Irrigation scheduling and application rates of each irrigation water for wheat based on cumulative pan evaporation (CPE) at IW: CPE ratios of 0.60, 0.75, 0.90 and 1.10 and adjusted for rainfall. The detailed treatment set up is listed below.
Irrigation
I1: Irrigation at 17-21, 45-55 and 65-75 DAS (recommended schedule)
I2: IW:CPE = 0.60 (17-21 DAS), 0.75 (45-50 DAS), 0.90 (60-65 DAS), 1.05 (75-85 DAS).
I3: Irrigation at 17-21 DAS.
Fertilizer doses
F1: Recommended dose, (kg ha-1): N120P33K50S20B1
F2: 25 % less of all recommended basal dose
F3: 20 % less of all recommended basal dose
F3: 15 % less of all recommended basal dose
Daily pan evaporation was recorded from the standard ‘USWB class A’ pan.
BARI Annual Report 2011-2012
Based on the results obtained from the study, irrigation scheduling based on sensitive growth stages was found better than the schedules based on cumulative pan irrigation in respect of grain yield and water productivity. Grain yield also decreased with the decreasing rate of the recommended fertilizers doses. So farmers are suggested to apply irrigation as per weter sensitive growth stages of wheat with optimum fertilizer dose.
Report/Proceedings