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Effect of Nitrogen Levels and Gliricidia Sepium Alley Widths on Rice Based Agroforestry Systems

S Mondal
Senior Scientific Officer
Regional Station, BRRI, Satkhira

M G Miah
Professor
Department of Agroforestry and Environment, BSMRAU,Gazipur

N E Elahi
Former Director General
BRRI, Gazipur

M A Saleque
Coordinator for Advanced Studies and Research, BRRI, Gazipur

A. Rahman
Associate Professor
Department of Agroforestry and Environment, BSMRAU, Gazipur

Abstract/ Executive Summary:

An experiment was conducted at the research farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU) during May to September 2008 to investigate the effect of alley widths of Gliricidia sepium and different nitrogen levels on yield of Aus rice (BR24). The experiment was laid out in a split-plot design with three replications. Three alley widths 3.0, 4.5, and 6.0 m and a control, without tree were compared under five N doses 0, 18.75, 37.5, 56.25 and 75 kg ha ^-1. G. Sepium species gave the highest (20.24 t ha^-1) pruned materials from closer alley width (3m). The highest grain yield (3.54 t ha^-1) of rice was obtained at 75 kg N from urea and pruned materials (PM) in 4.5 m alley width. The study suggests that G. sepium can contribute to increase rice yield and increase N use efficiency.

Keywords: Agroforestry systems, Alley, Nitrogen levels, Yield

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU)

Start Date: 00-05-2008

End Date: 00-09-2008

Program Area: Farming System

Commodity: Gliricidia

Objectives:

To evaluate the performance of Gliricidia sepium as well as to assess the N- fertilizer saving and the productivity of rice grown at varying alley width of Gliricidia sepium, under different N-levels.

Methodology:

The experiment was conducted at the Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU) research farm, Gazipur during the period from May 2008 to September 2008 under rainfed condition.The Gliricidia sepium seedlings were transplanted in line at 50 cm apart in the experimental field in September, 2005 and adequate management practices were done to establish the seedling. Alley widths were 3.0, 4.5 and 6.0 m. Every alley was divided into 15 unit plots comprising three replications and five levels of nitrogen. The unit plot length was 5 m. So, total area of a unit plot was 3 x 5, 4.5 x 5 and 6 m x 5 m for alley of 3.0, 4.5 and 6.0 m, respectively. The five sub plots having different nitrogen levels were No (zero dose of N) + Pruned materials (PM), N25 (25% of recommended N dose) + PM, N₅₀ (50% of recommended N dose) + PM, N₇₅ (75% of recommended N dose) + PM, N₁₀₀ (100% of recommended N dose) + PM. Control plots (15 in number with 3 replications) received five N levels 0, 18.75, 37.5, 56.25 and 75 kg ha^-1 but no PM was used in those plots. The control plots were kept to compare the results with crop yields under alley cropping system. Urea was used as the source of different nitrogen doses. The experiment was laid out in a split-plot design, each treatment had three replications. Alley widths of Gliricidia sepium were in main plots, and five nitrogen levels were distributed to sub-plot under each alley widths. Seeds were sown in line sowing in the assigned plots of alleys as well as in the control plots from 17 to 18 May 2008. The seeds were sown in line sowing at the rate of 50 kg per hectare at 25 cm line to line distance. Effective grain yield = Yield of 01 linear meter occupied by tree+ Grain yield of alley cropping systems. The data relating to yield and yield contributing characters of rice and tree performance were subjected to analysis of variation (ANOVA) with the help of computer “MSTATC” program. The means were compared by using DMRT

Source of Information: Bangladesh Rice J. 17(1&2): 26-32, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Three alley widths 3.0, 4.5, and 6.0 m and a control, without tree were compared under five N doses 0, 18.75, 37.5, 56.25 and 75 kg ha ^-1. G. Sepium species gave the highest (20.24 t ha-¹) pruned materials from closer alley width (3m). The highest grain yield (3.54 t ha-¹) of rice was obtained at 75 kg N from urea and pruned materials (PM) in 4.5 m alley width. The study suggests that G. sepium can contribute to increase rice yield and increase N use efficiency.

Knowledge Management: Journal