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Effect of Nitrogen Fertilization on Growth, Nodulation and Biomass Yield of Green Manure Crops

M.Y.A. Pramanik
Department of Agriculture Extension, Khamarbari, Dhaka, Bangladesh

M.A.R. Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh

M.S.R. Salim
Department of Agriculture Extension, Khamarbari, Dhaka, Bangladesh

G.M. Faruk
Department of Agriculture Extension, Khamarbari, Dhaka, Bangladesh

Abstract/ Executive Summary:

Keywords: Green manure crops, Nitrogen, Nodulation, Biomass

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 08-04-2004

End Date: 23-06-2004

Program Area: Crop-Soil-Water Management

Commodity: Manures

Objectives:

1. To observe the performance green manures as affected by nitrogen fertilization.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from 8 April 2004 to 23 June 2004 to investigate the effect of nitrogen rate on plant height, biomass yield and nodulation of green manure crops. The experiment consisted of seven green manure crops viz. Sesbania rostrata, Sesbania aculeata, Crotalaria juncea, Vigna unguiculata, Phaseolus mungo, Vigna radiata and Glycine max and three nitrogen levels viz. 10 kg (100% of the recommended dose), 15 kg (150% of the recommended dose) and 20 kg N ha-1 (200% of the recommended dose). The recommended nitrogen dose was taken. The experiment was laid out in a randomized complete block design with three replications. The unit plot size was 4.0m x 2.5m. The land was prepared by a power-tiller with several ploughings and cross ploughings followed by laddering to level the land. Weeds and other plant residues were collected and removed from the field. The land was fertilized with P, K and S at 18, 26 and 12 kg ha^–1, respectively at final land preparation in the form of triple super phosphate, muriate of potash and gypsum. Different doses of N were applied in the form of urea according to treatment specification at final land preparation. Seeds of green manure crops were sown on 8 April 2004 in all unit plots randomly as per layout of the experiment. Five plants were randomly selected in each plot for each destructive sampling to record the data on plant height, fresh biomass and number of nodules plant^-1 at 15 day intervals beginning from 30 days after sowing (DAS) up to 75 DAS. Collected fresh samples were oven dried in an electrical oven at 65⁰C for 72 hours to record the dry biomass yield. Central five square metres area in each plot was harvested to record the fresh biomass yield plot^-1, which was converted to t ha^-1. The recorded data were compiled and tabulated for statistical analysis. Analysis of variance was done with the help of the computer package M-STAT. Means were adjudged by Duncan's Multiple Range Test

Source of Information: J. Agrofor. Environ. 3 (1): 199-202, 2009; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Fresh biomass yield was significantly influenced by nitrogen fertilization at all days after sowing. The highest fresh biomass yield at 30, 45, 60 and 75 DAS were observed by the application of 20 kg N ha^-1, the highest doses for cultivation of green manure crops. The result followed in order by 15 kg and the lowest fresh biomass yield was obtained when the crop was fertilized with 10 kg N ha^-1.

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