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Influence of Nitrogen Fertilization and Irrigation on the Growth and Seed Yield of Lentil

M.A. Salam
Research and Development Executive
Green Bangla Agrovet Ltd.

M.S. Islam
Product Development Officer
Rajib Agro Chemicals Limited, Dhaka.

M.K. Islam
Senior Scientific Officer
Department of Agronomy and Plant Genetic Resources Center, Bangladesh Agricultural Research Institute.

M.A. Kawochar
Scientific Officer
Plant Genetic Resources Center, Bangladesh Agricultural Research Institute.

M.S.I. Sikdar
Department of Agronomy, Hajee Mohammad Danesh Science and Technology University, Dinajpur- 5200, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted at the Sher-e-Bangla Agricultural University farm, Dhaka to study the influence of nitrogen fertilization and irrigation on the growth parameters of lentil (Lens culinaris) cv. BARI mashur-4 during the period from November 2006 to March 2007. Ten treatment combinations of 20, 30, and 40 kg N ha^-1 applied at sowing and 2 equal split at sowing and flowering stage with and without irrigation were tested. Irrespective of treatment differences the lentil plant as a pulse crop showed a lag phase in early growth stage (up to 25 DAS) to produce number of leaves, leaf dry weight and stem dry weight per plant. Application of 20 kg N ha^-1 as basal with 20 kg N ha^-1 as split application with one irrigation at flower initiation stage (55 DAS) of lentil improved the growth parameters significantly. Maximum dry matter eventually supported the plant to produce more number of branches and biological seed yield.

Keywords: Growth, Lentil, Irrigation, Nitrogen

Location: Sher-e-Bangla Agricultural University farm, Dhaka.

Start Date: 00-10-2006

End Date: 00-03-2007

Program Area: Crop-Soil-Water Management

Commodity: Lentil

Objectives:

To determine the optimum N dose and appropriate time of N application along with irrigation for maximizing the seed yield of lentil.

Methodology:

The experiment was laid out in a Randomized Complete Block Design (RCBD) with 3 replications. The size of each plot was 4.2 m x 2.5 m. The distance between two adjacent replications (block) was 1.5 meter and plot-to-plot distance was 0.75 meter. The intra block and plot spaces were used as irrigation and drainage channels. BARl mashur-4 (Lens culinaris) was used in this experiment as the test crop. The experimental plot was irrigated to remove its hard dryness before ploughing. Then at "zoe" condition five times ploughing, harrowing and laddering were done to have a desirable tilth. The plots were fertilized with Urea, Triple Super Phosphate (TSP), Muriate of Potash (MOP) and Zypsum as a source of N, phosphorous, potassium and sulpher respectively. N was applied as per treatment. TSP, MOP and Zypsum were applied as basal dose at the rate of 85 kg, 33 kg and 45 kg per hectare, respectively. Seeds were sown on 16 November, 2006 continuously in 30 cm apart rows having a depth of 2-3 cm. Two thinnings at 15 and 30 DAS were done to maintain optimum plant to plant distance of 10 cm. The crop was weeded twice at 20 DAS and 48 DAS. Flood irrigation was given as per treatment followed by mulching. Plant protection measures were taken as and when necessary. Harvesting was done on 6 March, 2007 at full maturity. The plants were collected from a pre demarcated area of six I inear meters (1.8 m²) at the center of each plot and data on growth characters were recorded. Plant heights of pre-selected ten plants were measured with a meter scale from the ground level to the top of the plants and numbers of branches, and leaves (trifol iate) per plant were counted. Ten plants were randomly selected from each treatment and leaves, stems, and reproductive parts (flowers and pods) were separated from each plant, then dried separately in an oven at 70 ºC for 48 hours and weight was taken carefully. The sum of the plant parts (leaves dry weight, stem dry weight and reproductive dry weight) constituted the above ground dry weight of plant. The seeds collected from 1.8 m² of each plot were sun dried properly and weighed and converted the yield in kg ha^-1. The collected data were analyzed by using the MSTAT-computer package program. The means were adjudged by least significant deference (LSD) at 0.05 level of significance.

Source of Information: Journal of Science Technology (Dinajpur) Vol. 8: 142-149 (2010), ISSN 1994-0386

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Irrespective of treatment differences the lentil plant as a pulse crop showed a lag phase in early growth stage (up to 25 DAS) to produce number of leaves, leaf dry weight and stem dry weight per plant. Application of 20 kg N ha^-1 as basal with 20 kg N ha^-1 as split application with one irrigation at flower initiation stage (55 DAS) of lentil improved the growth parameters significantly. Maximum dry matter eventually supported the plant to produce more number of branches and biological seed yield.

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