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Effect of Green Manures and Levels of Nitrogen on Some Growth Attributes of Transplant Aman Rice

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

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

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

M.Y.Ali
Agro technology Discipline, Khulna University, Khulna-9208, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy Field Laboratory, 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 the growth performance of transplant aman rice (cv. BRRl dhan 32). The experiment consisted of 3 green manuring crops viz. Sesbania rostrata, Sesbania aculeata and Crotalaria juncea and 5 levels of nitrogen viz. 0, 20, 40, 60 and 80 kg ha^-1. Growth attributes such as leaf area index, crop growth rate and net assimilation rate increased up to 67 DAT irrespective of green manure crops and different levels of nitrogen and thereafter declined. On the other hand, plant height and leaf area duration increased with the increasing levels of nitrogen in combination with green manuring crops. Application of 40 kg N ha^-1 along with Sesbania rostrata green manuring showed the best performance in respect of grain yield and net assimilation rate of transplant aman rice. S. aculeata exhibited similar behaviour as that of S. rostrata but Crotalaria juncea showed relatively poor performance in respect of growth attributes of rice due to less amount of biomass added during incorporation.

Keywords: Green manuring, Nitrogen, Growth attributes, Transplant aman rice

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-05-1998

End Date: 00-11-1998

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To study the effect of green manure and different levels of nitrogen on the growth performance of transplant aman rice.

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 Old Brahmaputra Floodplain (AEZ-9) and characterized by non-calcareous dark gray floodplain soil belonging to the Sonatola soil series. The soil was silt loam in texture having pH 5.38 and 1.19% organic matter. The experiment consisted of 3 green manure crops viz. Sesbania rostrata, Sesbania aculeata and Crotalaria juncea and 5 levels of nitrogen viz., 0, 20, 40,60 and 80 kg ha^-1. The experiment was laid out in a randomized complete block design with 3 replications. Seeds of green manure crops were sown at the rate of 50, 40 and 50 kg ha^-1 for S. rostrata, S. aculeata and C. juncea, respectively, on 18 May. Green manuring crops were fertilized with N, P₂O₅ and K₂O at 10-20-15 kg ha^-1, respectively, before sowing. Sixty day old green manuring plants were chopped into pieces and incorporated in the soil by spading 10 days before transplanting of rice seedlings. The mean fresh biomass and dry biomass production from S. rostrata, S. aculeata and C. juncea were 18.41,22.56,15.83 and 4.57, 5.68 and 4.21 t ha^-1, respectively. The corresponding nitrogen addition through these green manures were 51.18, 35.22 and 31.57 kg ha^-1. Forty day old rice seedlings were transplanted at a spacing of 20x15 cm with three seedlings hill^-1. Transplant aman rice was fertilized with 60 kg P₂O₅, 40 kg K₂O, 60 kg gypsum and 10 kg ZnSO ₄ha^-1 during land preparation. Nitrogen, as specified in the treatment, was applied in the form of urea in three equal splits at 20, 35 and 50 days after transplanting (DAT). Different growth parameters such as plant height, leaf area index (LAI), crop growth rate (CGR), net assimilation rate (NAR) and leaf area duration (LAD) were recorded at 15 day intervals beginning 37 DAT up to harvesting following the standard formula. All management practices were done at proper time starting from land preparation to crop harvest Soil samples were collected three times to determine its physico-chemical properties. Data recorded on growth attributes were statistically analyzed using "analysis of variance" and differences among treatment means were adjudged with Duncan's multiple range test.

Source of Information: Pakistan Journal of Biological Sciences 7 (5): 739-742, 2004; ISSN 1028-8880

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the study it may be concluded that S. rostrata appeared as the promising green manuring species compared to S. aculeata and C. juncea. S. rostrata in combination with 40 kg N ha^-1 emerged out as a promising practice for the growth and yield of transplant aman rice.

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