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Integrated Crop, Nutrient and Water Management in North-west Region of Bangladesh (petrra Funded)-interaction Effects of Fertilizer and Irrigation on Boro Rice Cultivation-04

Dr M A Sattar
CSO and Head
IWMD, BRRI, Gazipur

Dr M Maniruzzaman
PSO
IWMD, BRRI, Gazipur

Dr F I M Golam Wahed Sarkar
PSO
Agril Economics Division, BRRI

Dr Jotish C Biswas
CSO and Head
Soil Science Division, BRRI

Abstract/ Executive Summary:

A field experiment was conducted to determine the optimum number of irrigation and water use efficiency for maximum yield; to determine the interaction effect of irrigation numbers and fertilizer doses on Boro rice production under recommended management; and to find out the economically viable combination of irrigation and fertilizer management. At study site, 3 shallow tubewells (STW) based farmers were selected for this study. At least one farmer was selected for each location based on thefarmers chosen BRRI released latest varieties. Farmers chosen BRRI dhan28 for cultivation. The soil texture of the study sites was determined. The experiments were laid out in a Split-plot Design (SPD) with the following treatment combinations where irrigation in the main plot and replicated three times within the selected farmers fields. One farmers’ field was considered as one replication. Irrigation treatments were chosen based on the best findings of the field experiments and BRRI findings. The irrigation treatments were: I₁ = Alternative irrigation after 3 days of disappearing standing water, I₂ = Farmer irrigation management (always standing water and fertilizer levels were: F₁ = 100-24-42-10-3.5 (BRRI recommendation), F₂ = 175-35-122-11-1.8 (STB-Kurigram), 126-40-55-12-1 (STB-Pirganj) and F₃= 188-16-40-9-0 (STB-Kurigram), 126-40-55-12-1 (STB-Pirganj), 105-17-25-11-0 (FFM-Pirganj.In KGF and RDRS sites, there were significant yield differences because of fertilizer and water management. The highest yield was recorded in STB fertilizer management followed by BRRI recommendation in both the locations irrespective of water management. The insignificant influence of varied irrigation levels might be because of rain water received by the crop during the crop’s growing period (discussed earlier). However, about 25% less amount of water was required in alternate irrigation at 3 days after disappearance of standing water (I1) compared to farmers practice in both the project sites and on an average 0.5–1.0 t/ha higher yield was found. In STB fertilizer treatment, more fertilizer required compared to others. However, farmers’ in Kurigram site used the highest amount of urea. Although farmers’ applied more water, they got lower yield because of imbalanced fertilizer used by them. There was about 1.0 t/ha higher yield in Kurigram site compared to Pirganj site due to proper management and early transplanting of Boro crop. To maintain STB fertilizer in combination with reduced water management (I2), additional Tk. 2000/ha was needed for obtaining added benefit of Tk. 6500/ha compared to farmers’ practices in both the ICWM sites.

Keywords: STB fertilizer management, Irrigation and Water use efficiency, Maximum yield

Location: GKF site, Kurigram and at RDRS site, Pirganj, Thakurgaon

Start Date: 01-07-2003

End Date: 30-06-2004

Program Area: Crop-Soil-Water Management

Commodity: Land development productivity

Objectives:

To determine the optimum number of irrigation and water use efficiency for maximum yield;
To determine the interaction effect of irrigation numbers and fertilizer doses on Boro rice production under recommended management; and
To find out the economically viable combination of irrigation and fertilizer management.

Methodology:

At study site, 3 shallow tubewells (STW) based farmers were selected for this study. At least one farmer was selected for each location based on the farmers chosen BRRI released latest varieties. Farmers chosen BRRI dhan28 for cultivation. The soil texture of the study sites was determined. The experiments were laid out in a Split-plot Design (SPD) with the following treatment combinations where irrigation in the main plot and replicated three times within the selected farmers fields. One farmers’ field was considered as one replication. Irrigation treatments were chosen based on the best findings of the field experiments and BRRI findings. The irrigation treatments were: I₁ = Alternative irrigation after 3 days of disappearing standing water, I₂ = Farmer irrigation management (always standing water and fertilizer levels were: F₁ = 100-24-42-10-3.5 (BRRI recommendation), F₂ = 175-35-122-11-1.8 (STB-Kurigram), 126-40-55-12-1 (STB-Pirganj) and F₃= 188-16-40-9-0 (STB-Kurigram), 126-40-55-12-1 (STB-Pirganj), 105-17-25-11-0 (FFM-Pirganj. The total rainfall was observed about 254 mm and 226 mm during the whole Boro rice growing season in Kurigram and Pirganj, respectively. The rainfall occurred at the whole rice growing season, which helped increasing yield and reduce the irrigation intensity. The soil texture of those sites is silty loam to sandy loam. In research management plots the fertilizers and irrigation were applied as per treatments and in farmers’ management plot the fertilizers and irrigation were applied as per farmers’ doses. The amount of water applied for each irrigation was measured by V-Notch and the rainfall data was recorded during crop-growing season. Yield and yield contributing data for each water treatment was measured following the standard method. The collected data were analyzed statistically and Duncan’s Multiple Range Test (DMRT) was used to determine the significant differences among the treatments. The water use efficiency was also calculated for each treatment.

Source of Information: BRRI annual Review 2004

Article Link (Online Journal):

Funding Source:

1. Asian Development Bank	Budget:
2.	Budget:

Total Budget (Tk.) :

Achievement/Findings:

In KGF and RDRS sites, there were significant yield differences because of fertilizer and water management. The highest yield was recorded in STB fertilizer management followed by BRRI recommendation in both the locations irrespective of water management. The insignificant influence of varied irrigation levels might be because of rain water received by the crop during the crop’s growing period (discussed earlier). However, about 25% less amount of water was required in alternate irrigation at 3 days after disappearance of standing water (I1) compared to farmers practice in both the project sites and on an average 0.5–1.0 t/ha higher yield was found. In STB fertilizer treatment, more fertilizer required compared to others. However, farmers’ in Kurigram site used the highest amount of urea. Although farmers’ applied more water, they got lower yield because of imbalanced fertilizer used by them. There was about 1.0 t/ha higher yield in Kurigram site compared to Pirganj site due to proper management and early transplanting of Boro crop. To maintain STB fertilizer in combination with reduced water management (I2), additional Tk. 2000/ha was needed for obtaining added benefit of Tk. 6500/ha compared to farmers’ practices in both the ICWM sites.

Knowledge Management: Report/Proceedings