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Effect of Plant Density on Canopy Structure, Growth and Yield in Sunnhemp

H. Barua
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202

A.K. Barua
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202

M.S.A. Fakir
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

Effect of five planting densities (15, 25, 30, 35 and 55 plants/m²) on morphological features, dry mass (DM) production, reproductive efficiency and seed yield was investigated at Mymensingh (24⁰ 45'N, 90⁰ 11'E) in sunnhemp (Crotalaria juncea). Results revealed that plants at the lowest density (15 plants/m²) flowered and matured late. Tap root length, number of effective branches/ plant, leaf/plant, racemes/plant and TRU/plant (total reproductive unit) were significantly greater at 15 plants/m². Total DM yield/plant was greater at 15 and 25 plants/m² (average of 300.7 g/plant) than in the others. The seed yield/plot was also greater at 15 and 25 plants/m² (average of 0.87kg). In the present study, it was not possible to achieve optimum density for seed and DM yield in Sunnhemp. Future research in this regard is suggested.

Keywords: Population, Biomass, Reproductive efficiency, Crotalaria juncea

Location: The field laboratory, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

Start Date: 17-11-2005

End Date: 07-04-2006

Program Area: Crop-Soil-Water Management

Commodity: Fodder

Objectives:

1. To study the effect of different plant populations on some of the important morphological features 2. To investigate the effect of densities on DM production and seed yield at maturity stage and 3. To determine the optimum density for seed and DM yield in the sunnhemp.

Methodology:

The experiment was conducted at the field laboratory, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, between 17 November 2005 and 7 April 2006. Five treatments (15, 25, 30, 35, and 55 plants/m2) were randomly allotted to each plot in a block. The desired densities were achieved by planting seeds at 25 × 30 cm, 25 × 25 cm, 25 × 20 cm, 25 × 15 cm, 25 × 10 cm, respectively. The experimental plots were divided into four blocks each representing a replication. Each block was then divided into five unit plots each of 3 m x 2 m size. Important parameters relevant to morphological structures, dry mass production and partitioning and seed yield were recorded at maturity stage. Total reproductive unit (TRU) was estimated following the method i.e. TRU /plant = No. of mature pod + No. of immature pod + No. of flower + No. of bud + No. of scars. Per cent podset estimated was as follows: % Podset= (No of matured pods ÷ TRU) × 100. Total dry mass (TDM)/plant were estimated by collecting and oven drying (80⁰ ±2⁰C, for 48 hour) plant parts excluding roots as follows: TDM yield/plot = TDM/plant × actual no. of plants/plot. Data were compiled and analysed and mean differences were evaluated by Duncan’s New Multiple Range Test.

Source of Information: J. Agrofor. Environ. 3 (1): 61-63, 2009; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results revealed that plants at the lowest density (15 plants/m²) flowered and matured late. Tap root length, number of effective branches/ plant, leaf/plant, racemes/plant and TRU/plant (total reproductive unit) were significantly greater at 15 plants/m². Total DM yield/plant was greater at 15 and 25 plants/m² (average of 300.7 g/plant) than in the others. The seed yield/plot was also greater at 15 and 25 plants/m² (average of 0.87kg). In the present study, it was not possible to achieve optimum density for seed and DM yield in Sunnhemp. Future research in this regard is suggested.

Knowledge Management: Journal