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Integrated Management of Green Manures and Nitrogen Fertilizer on the Growth of Transplant Aman Rice

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

M.Y.A. Pramanik
Additional Agriculture Officer, Dept. of Agriculture Extension, Khamarbari, Dhaka,

M.A. Samad
Assistant Horticulturist
Department of Agriculture Extension, Longadu, Rangamati

M.S. Islam
Senior Scientific Officer
Bangladesh Agriculture Research Institute, OFRD, Rajshahi

Abstract/ Executive Summary:

A field experiment was conducted at the Agronomy Field laboratory, Bangladesh Agricultural University, Mymensingh to study the effect of integrated management of green manures and nitrogen fertilizer on the growth of transplant Aman rice (cv.BRRIdhan32).The experiment comprised of three green manures viz., Sesbania rostrata, Sesbania aculeata and Crotalaria juncea and 5 nitrogen (N) levels viz., 0, 20, 40, 60 and 80 kg ha-i. Absolute control and recommended dose of nitrogen (i.e., 80 kg N ha-1) and @ 20 t ha-1 of well-decomposed cow dung were also included. Growth attributes of transplant Aman rice such as plant height, leaf area index (LAI), leaf area duration (LAD), dry matter production and grain yield due to green manures in combination with 40 kg N ha-1 were statistically identical to 80 kg N ha-1. On the other hand, cow dung at 20 t ha-1 was comparable with sole green manuies in these parameters . Growth attributes showed higher values with the incorporation of green manures in combination with higher levels of nitrogen. The growth performance of rice due to using of cow dung at 20 t ha-1 varied and it recorded lower values than that of 80 kg N ha-i. Growth attributes of transplant aman rice with green manures S. rostrata and S. aculeata in combination with nitrogen were at par and C. juncea recorded lower values. All green manuring crops in combination with 40 kg N ha' produced the highest grain yield in transplant Aman rice.

Keywords: Green manure, Nitrogen, Cowdung, Transplant Aman rice, Growth

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-05-1999

End Date: 00-11-1999

Program Area: Crop-Soil-Water Management

Commodity: Rice, Green manuring, Nitrogen, T. Aman

Objectives:

In double-cropped irrigated areas rice-rice pattern is the predominant cropping pattern. This cropping pattern covers about 60% of the boro rice-based areas (BRRI, 1998). After harvesting of boro rice, the land remains vacant for about 2-3 months. This period could be used for raising green manures without sacrificing main crops. Therefore, the experiment was conducted to study the effect of green manuring in combination with nitrogen fertilizer on the growth attributes and yield 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 1999. The experimental site was a medium high land which belonged to the Old Brahmaputra Flood Plain (AEZ-9). The soil was silty clay having pH 6.26, 1.21% organic matter, 0.059% N, 20 ppm P. 26 ppm K, and 18 ppm S. Experimental treatments consisted of 3 green manure crops viz., Sesbania rostrata, Sesbania aculeata and Crotalaria juncea, 5 levels of N viz., 0, 20, 40, 60 and 80 kg ha-1 (recommended dose of N i.e., RDN); cow dung at 20 t ha-1, fallow + 0 kg N (absolute control) and fallow + 80 kg N ha'. There were in total 18 treatments in the experiment. The experiment was laid out in a randomized block design with 3 replications. Green manuring crops were sown on 15 May with 50 kg seed ha-1. Green manures were fertilized with 15 kg N, 30 kg P2O5 and 15 kg K20 ha-1 at final land preparation. Sesbania rostrata seeds were treated with hot water at 75-80°C for 2 minutes and were dried in the air before sowing. Sixty day old green manuring crops were incorporated in the soil. The mean fresh biomass and dry biomass production of 60 day-old S. rostrata, S. aculeata, C. juncea were 18.24, 16.06 and 13.57 t ha-1 and 4.38, 4.02 and 3.66 t ha-1, respectively. The corresponding N addition through these green manures were 43.79, 24.92, 27.45 kg ha-1, respectively. Thirty-five-day-old seedlings of transplant Aman rice were transplanted at a spacing of 20 cm x 15 cm after 10 days of incorporation of green manuring crops. The plots were fertilized with 60 kg P2O5, 40 kg K20 and 60 kg gypsum ha-1 at final land preparation. Well decomposed cow dung @ 20 t ha-1 was mixed in the specific plots at final land preparation. Nitrogen was applied in the form of urea in three equal splits at 20, 35 and 50 days after transplanting (DAT). All the management practices were done in proper time starting from land preparation to crop harvest. Data were recorded on growth attributes and yield of transplant Aman rice. Recorded data were analyzed statistically using the "Analysis of Variance" technique and mean differences were adjudged with Duncan's Multiple Range Test (Gomez and Gomez, 1984)

Source of Information: J. Bangladesh Agril. Univ. 2(1): 41-45,2004 ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the study, it may be concluded that green manures in combination with the highest levels of nitrogen gave the highest values in respect of growth attributes. On the other hand, all green manuring crops in combination with 40 kg N ha-1 produced the highest grain yield and emerged as a promising practice for higher yield in transplant Aman rice.

Knowledge Management: Journal