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Research Detail

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Rokonuzzanan
Scientific Officer
RARS, Ishwardi

A.R.Akanda
Chief Scientific Officer
IWM Division, BARI

S.K. Biswash
Senior Scientific Officer
IWM Division, BARI

M.R. Karim
Scientific Officer
OFRD, BARI, Pabna

The experiment was conducted during rabi season of 2014-15 at the research field of the Regional Agricultural Research station, BARI, Ishwardi, Pabna to find out the water requirements of wheat on raised bed and to relate soil moisture content behavior with the changing climatic parameters. This study consisted of following irrigation treatments, T1= Three irrigation at (17-21) DAS, (55-60) DAS and (75-80) DAS, T2= Irrigation at 30% soil moisture depletion (SMD), T3= Irrigation at 50% soil moisture depletion (SMD), T4= Irrigation at 60% soil moisture depletion (SMD) and laid out in a RCB design with four replications. The result showed that a significant effect of irrigation treatments on plant height, plant per m2, and grain per spike, 1000 grain weight and grain yield. The highest grain yield (3.82 t/ha) was obtained from treatment irrigated at 17-21 55-60 and 75-80 DAS over the treatments at 30%, 50% and 60% SMD level so the used   307 mm, 236 mm, 250 mm, and 220 mm of seasonal water , respectively. The second highest yield (3.55 t/ha) was obtained at 30% SMD level and closest to T1.

  Climatic parameters, Raised bed, Irrigation, Wheat
  RARS, Ishurdi, Pabna
  00-00-2014
  00-00-2015
  Crop-Soil-Water Management
  Supplemental irrigation

To determine the water requirements of wheat on raised bed and to relate soil moisture content behavior with the changing climatic parameters.

 

The experiment was conducted during rabi season of 2014-2015 at the research field of the Regional Agricultural Research station, Ishurdi, Pabna. The experimental field soil was silty clay loam having field capacity of 28%, permanent wilting point of 13% and bulk density of 1.49 g cm-3. The experiment was conducted using a Randomized Complete Block Design with four replications. BARI Gom-28 was sown in individual plot of size 7 × 7.5 m, on raised bed with 40 cm base width, 20 cm top width, 15 cm height and 20 cm distance between two beds. The beds were formed by bed planter and were subjected to the following treatments.

T1 = Three irrigation at 17-21 DAS, 55-60 DAS and 75-80 DAS (Full Irrigation)

T2 = Irrigation at 30% soil moisture depletion (SMD) 

T3 = Irrigation at 50% soil moisture depletion (SMD) 

T4 = Irrigation at 60% soil moisture depletion (SMD)

Seeds were sown on 24 November 2014 and harvested on 23 March 2015. SMD was determined by monitoring soil moisture contents. For this purpose, soil samples were taken from the effective root-zone of the wheat plant (0 – 90 cm). The root-zone was divided into 3 depths viz., 0-15, 15-30 and 30-45 cm. Soil samples were collected from these 3 depths with the help of an Augur. The fresh weight of the soil sample was immediately recorded with the help of a portable weighing balance. After weighting, the samples were stored in soil sampling core which were then placed in an electric oven for 24 hour at 100°C. The dry weight of the samples was then recorded. Irrigation water was applied up to field capacity at each irrigation. The amount of water applied to each treatment was calculated on the basis of the soil moisture contents at the time of irrigation.

     d = Fc-Mc/100 x As x Bd 

Where,

d          = Depth of water to be applied (cm)

MC     = Moisture content (%) at the time of irrigation (FC-MCi)

A.S      = Apparent specific gravity of soil

D         = Depth of root-zone to be irrigated (cm)

F.C       = Moisture content at field capacity of soil (%)

MCi     = Moisture content at the time of irrigation (%)

The depth of rooting was considered 45 cm. It is reported that 70 % of total moisture is extracted from the 50 % effective root zone depth (Michael, 1996).  The seasonal crop water use was calculated. All other agronomic practices were carried out uniformly. At maturity, data were collected on grain yield. Water use efficiency was used in evaluating the yield performance and water management practices. The water utilized by the crop was calculated

  Annual Research Report, IWM Division, BARI--2013--14
  
Funding Source:
1.   Budget:  
  

Wheat may be cultivated on raised bed system with 3 irrigation for higher yield. Wheat may be also cultivated on raised bed system with 2 irrigation sacrificing minimum grain yield. This technology saves 26.9% of irrigation water compared to conventional method. As, it is first year study, final conclusion can be drawn after further trial.

 

  Report/Proceedings
  


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