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Yield Potential of Lentil Under Different Soil Moisture Status

A. A. Sarkar
Agricultural Engineering Division. Bangladesh Institute of Nuclear Agriculture, P.O. Box 4. Mymensingh 2200. Bangladesh

A. A. Hassan
Agricultural Engineering Division. Bangladesh Institute of Nuclear Agriculture, P.O. Box 4. Mymensingh 2200. Bangladesh

M. H. Ali
Agricultural Engineering Division. Bangladesh Institute of Nuclear Agriculture, P.O. Box 4. Mymensingh 2200. Bangladesh

N. N. Karim
Agricultural Engineering Division. Bangladesh Institute of Nuclear Agriculture, P.O. Box 4. Mymensingh 2200. Bangladesh

Abstract/ Executive Summary:

Field experiments were conducted during 1994-95 to 1996-97 on a silt-loam soil at lshurdi, Bangladesh to study the impact of various irrigation levels on the yield of some advanced mutants of lentil. In a split-plot design, irrigation was applied in main-plots and cultivars in sub-plots. Four irrigation treatments were followed in this experiment, viz. control (no irrigation), one common irrigation was applied after 20 to 25 days of sowing plus later irrigation in the last two treatments was given following IW/CPE ratios of 0.4 and 0.75. henceforth referred to as T_o, T₁, T₂ and T₃ respectively. The results showed that irrigation had significantly negative effect on the yield of lentil in all the experimental years. The highest yield and water use efficiency was recorded without irrigation and they gradually decreased with the increase of the irrigation amount. Thus, the experimental results revealed that for lentil cultivation in the study area, stored soil moisture with the prevailing rainfall is sufficient to produce its optimum yield and application of irrigation seems to be harmful to the crop.

Keywords: Yield potential, Lentil, Soil moisture

Location: BINA sub-station, Ishurdi

Start Date: 00-11-1996

End Date: 00-02-1997

Program Area: Crop-Soil-Water Management

Commodity: Irrigation scheduling

Objectives:

1. To investigate the influence of the adequacy or lack of water on the yield and water use efficiency of a few lentil mutants newly developed at the Bangladesh Institute of Nuclear Agriculture.

Methodology:

Field experiments were conducted during the winter seasons (Nov to Feb) of 1994-95, 1995-96 and 1996-97 at Ishurdi, a pulse growing area, with the geographical location at 24°06' N, 89°15' E at 34 m above mean sea level. Texturally the soil is silt-loam. The bulk density of 0 to 120 cm experimental soil profile ranged from 1.52 gm/cm to 1.63 gm/cm. The experiment was laid out in a split-plot design having the sizes of unit main-plots 5 x 8 m and sub- plots 5 x 2 m, applying irrigation in main plots (four treatments) and cultivars in sub-plots 4 varieties). The individual main-plots were bounded by 0.4 m wide levees constructed beforehand to hold the irrigation water. Besides this, additional 0.5 m space was left in between the levees as a buffer zone. A small space was also provided in between two sub-plots and the experiment was replicated thrice. At final land preparation, the experimental plots were uniformly fertilized with a basal dose of urea. triple super phosphate, muriate of potash. zinc oxide and gypsum. Soil moisture was monitored at sowing. before and after 24 hours of each irrigation and finally at harvest with a neutron moisture meter at an increment of 15 cm up to 120 cm soil depth. The growing season profile soil moisture was calculated. Crop water use or evapotranspiration (ET) was calculated by the water balance equation. Finally on maturity, the crop was harvested on 2nd week of March in each year and analyzed statistically. Then water use efficiency (grain) was calculated as: WUEg = GY/ET where WUEg is the water use efficiency for the grain yield (kg/ha/cm), GY is the grain yield (kg/ha), and ET is the total cumulative evapotranspiration (cm) over the growing season.

Source of Information: JOURNAL OF THE IEB/AE DIV. VOL. 27 NO.1 DEC. 2000

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The experimental results revealed that for lentil cultivation in the study area, stored soil moisture with the prevailing rainfall is sufficient to produce its optimum yield and application of irrigation seems to be harmful to the crop.

Knowledge Management: Journal