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Effect of Green Manures and Different Levels of Nitrogen on Plant Height, Tillering Behaviour, Dry Matter Production and Yield of Transplant Aman Rice

M. Y. A. Pramanik
Department of Agricultural Extension, Dhaka, Bangladesh.

M. A. R. Sarkar
Professor
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bnagladesh.

M. H. Kabir
Bangla Academy, Dhaka, Bangladesh.

G. M. Faruk
Department of Agricultural Extension, Dhaka, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted at the Bangladesh Agricultural University, Mymensingh during the period from May to November 1998 to investigate the effect of green manures and different levels of nitrogen on tillering behaviour, dry matter production and yield of transplant aman rice (cv. BRRI dhan32). The experiment was laid out in a randomized complete block design with three replications. The experiment comprised of 3 green manuring crops viz., Sesbania rostrata, Sesbania aculeata and Crotalaria juncea and 5 levels of N viz., 0, 20, 40, 60 and 80 kg ha^-1. Dry matter production was increased with the age of the plant and also increasing trend was observed irrespective of green manuring crops in combination with higher levels of nitrogen, but number of tillers hill^-1 increased up to 67 days after transplantation. The highest dry matter production and the highest number of tillers hill^-1 were obtained with the incorporation of S. rostrata in combination with 80 kg N ha^-1. S. aculeata also exhibited similar behaviour in these regards. The highest number of effective tillers hill^-1 and the highest grain yield were obtained with Sesbania spp. in combination with 40 kg N ha^-1 but C. juncea showed comparatively poor performance in respect of the aforesaid parameters due to less amount of biomass added during incorporation.

Keywords: Green manure, Nitrogen, Tillering, Dry matter, Yield, Transplant aman rice

Location: Bangladesh Agricultural University, Mymensingh

Start Date: 00-05-1998

End Date: 00-11-1998

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To examine the effect of green manure and nitrogen on plant characteristics

2. To determine its impact on the yield of paddy.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from May to November 1998. The experimental land was medium high in topography under the agro-ecological zone of Old Brahmaputra Floodplain (AEZ-9). The soil was silt loam in texture having pH 5.38 and 1.19% organic matter. The experiment consisted of 3 green manuring crops viz., Sesbania rostrata, Sesbania aculeata and Crotalaria juncea and 5 levels of N viz.0, 20, 40, 60 and 80 kg ha^-1. The experiment was laid out in randomized complete block design with 3 replications. Seeds of green manuring crops were sown on 19 May 1998 using seed rates of 50, 40 and 50 kg ha^-1 for S. rostrata, S. aculeata and C. juncea, respectively. During land preparation green manures were fertilized with 10 kg N, 20 kg P₂O₅ and 15 kg K₂O ha^-1 before sowing. Sixty day old green manuring crops were chopped into pieces and incorporated in the soil. The mean fresh biomass and dry biomass production of shoots of 60-day-old S. rostrata, S. aculeata and C. juncea were 18.41, 22.56 and 15.83 t ha^-1 and 4.57, 5.68 and 4.21 t ha^-1 and the corresponding addition of N were 51.18, 35.22 and 31.57 kg ha^-1, respectively. Forty day old seedlings of transplant aman rice were transplanted at a spacing of 20 x 15 cm after 10 days of soil incorporation of green manuring crops. The plots were fertilized with 60 kg P₂O₅,40 kg K₂O, 60 kg gypsum and 10 kg ZnSo₄ ha^-1 during final land preparation. Nitrogen as specified in the treatment was applied in the form of urea in three equal installments at 20, 35 and 50 days after transplanting. All management practices were done in proper time starting from land preparation to crop harvest. Data were recorded on plant height, tillering, dry matter production and yield of transplant aman rice. Recorded data were analyzed statistically using “Analysis of variance” technique and mean differences were adjudged with Duncan’s Multiple Range Test.

Source of Information: Asian Journal of Plant Sciences, 3 (2): 219-222, 2004, ISSN 1682-3974

Article Link (Online Journal): DOI: 10.3923/ajps.2004.219.222; URL: http://scialert.net/abstract/?doi=ajps.2004.219.222

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Green manuring with Sesbania rostrata in combination with 40 kg N ha^-1 appeared as the promising practice to positively effect and improve the growth and yield of transplant aman rice.

Knowledge Management: Journal