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Irrigation Effect on Cowpea Production in Chattogram Region (2018–2019)

M.P. Haque
Scientific Office
RARS, Hathazari, Chattogram

M.K.R. Bhuiyan
Chief Scientific Officer
RARS, Hathazari, Chattogram

M. A. HOSSAIN
Principal Scientific Officer
IWM Division, BARI, Gazipur

S.K. Biswas
Senior Scientific Officer
IWM Division, BARI, Gazipur

Abstract/ Executive Summary:

The study was conducted at the research field of Regional Agricultural Research Station, Hathazari, Chattogram during the rabi season of 2018-19 to identify the critical stages of irrigation and optimize irrigation in cowpea production. Five treatments were applied: T₁ (rain-fed i.e. local practice), T₂(irrigation at 3 weeks interval), T₃ (irrigation at the flowering stage), T₄ (irrigation at pod formation stage), T₅ (irrigation at flowering and pod formation stages). The highest yield (2.2 ton/ha) and highest water stress coefficient (K_s= 1 to 0.6) were found at higher frequency irrigation (T₂). The maximum irrigation (182mm) was applied at T₂. In rain-fed conditions (T₁), cowpea yield was the lowest (1.2 ton/ha). Crop production function of cowpea was Y=1.08+0.006X, R² =0.89 at 95% confidence interval. The sustainability of cowpea in low water stress co-efficient (up to 0.05) indicated that the field crop was drought tolerant. Irrigation at pod formation stage yield was higher than the flowering stage in case of only one irrigation facility. The flowering stage (K_y= 1.15) was more sensitive to deficit irrigation than the pod formation stage (K_y= 0.93). Based on the economic analysis, irrigation at three weeks interval was more beneficial (BCR=1.47).

Keywords: Irrigation, Cowpea production, soil moisture

Location: Regional Agricultural Research Station, Hathazari, Chattogram

Start Date: 00-10-2018

End Date: 00-03-2019

Program Area: Crop-Soil-Water Management

Commodity: Water management

Objectives:

To identify the critical stages of irrigation and optimize irrigation in cowpea production.

Methodology:

A field experiment was conducted at the research field of Regional Agricultural Research Station, Hathazari, Chattogram during the rabi season of 2018-19. The seeds were sown at 18 November 2018 and harvested at 25 March 2019. BARI Felon 1 was sown in 50 cm spacing from line to line, 10 cm from plant to plant and 100 cm border using randomized complete block (RCB) design with five treatments and three replications. The plot size was 4m by 4m and fertilizer was applied Urea@ 30kg/ha, TSP@ 45kg/ha, MP@ 30 kg/ha. The five irrigation treatments are i) Rainfed condition i.e. Local practice (T₁); ii) Irrigation at 3 weeks intervals(T₂); iii) Irrigation at flowering stage (T₃); iv) Irrigation at pod formation stage (T₄); v) Irrigation at flowering and pod formation stages (T₅) Amount of water to be applied during each irrigation was estimated by measuring soil moisture depletion from the field capacity. The water was applied by hose pipe.

Source of Information: Annual Research Report 2018–2019, Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The more frequent irrigation yields more production in cowpea. The three weeks interval irrigation gives the highest yield (2.2 ton/ha). The flowering stage is the critical stage of irrigation than pod formation stage. Irrigation at three weeks interval is more profitable on the basis of economic return (BCR=1.47). As this is the first year experiment, so the experiment should be continued in the next year for final conclusion.

Knowledge Management: Journal