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Determination of Row Spacing Based on Morpho-physiological Characters in Aus Rice

M. Monjurul Alam Mondal, PhD
Principal Scientific Officer
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to investigate the effect of variety and row spacing on morpho-physiological characters, yield attributes and yield of Aus rice. The experiment comprised of four Aus rice varieties viz., BR-26, BRRI dhan42, BRRI dhan43 and BRRI dhan48 and four row spacings viz., 15, 20, 25 and 30 cm. The hill to hill distance was 15 cm. Results revealed that number of tillers plant^-1, total dry mass hill^-1, absolute growth rate, relative growth rate, filled and unfilled grains hill^-1 increased with increasing row spacing. However, the seed and straw yield and harvest index was greater at closer row spacings than wider row spacings. The higher grain and straw yield per hectare and HI was observed in 15 and 20 cm row spacings. The lowest seed and straw yield per hectare was recorded in 30 cm row spacing for lower accommodation of plants per unit area. The results indicated that 15 cm row spacing is optimum for BRRI dhan42 and BRRI dhan43, and 20 cm row spacing is optimum for BR-26 and BRRI dhan48 for getting maximum grain yield.

Keywords: Row spacing, Aus rice, Yield

Location: Experimental field of the Bangladesh Agricultural University, Mymensingh, Bangladesh

Start Date: 14-04-2011

End Date: 25-08-2011

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To find out optimum row spacing for maximizing grain yield based on morpho-physiological attributes of recently released Aus rice varieties.

Methodology:

The experiment was conducted at the experimental field of the Bangladesh Agricultural University, Mymensingh, Bangladesh during the period from April to August 2011. Four widely cultivated varieties namely BR-26, BRRI dhan42, BRRI dhan42 and BRRI dhan48 were used in the experiment. Four row spacings of 15, 20, 25 and 30 cm were considered in the experiment. Within row, the hill to hill distance was 15 cm. A split plot layout with three replications was used where variety was placed in the main plot and row spacing was placed in the sub-plot. The unit plot size was 3.0 m × 3.0 m. A fertilizer dose of 75-60-34-5.0 kg ha^-1 of TSP, MP, gypsum and zinc sulphate, respectively, was applied at the time of final land preparation. Urea was applied @ 200 kg ha^-1 at three times equal splits at 15, 35 and 50 days after transplanting. Thirty-day old seedlings were transplanted 10 April 2011 at the rate two seedlings hill^-1 maintaining different spacings according to treatments. Different intercultural operations such as weeding, irrigation and pesticide spray were done as and when necessary. To growth study, two harvests were made at 35 and 50 DAT. The second and third rows of each plot were used for sampling. Five hills from each plot were randomly selected and uprooted for obtaining data of necessary parameters. The plants were separated into leaves, stems and roots and the corresponding dry weights were recorded after oven dry at 80 ± 2 ⁰C for 72 hours. The growth analyses like absolute growth rate and relative growth rate were analyzed according to Hunt (1978). The yield contributing characters were recorded at harvest from ten competitive plants of each plot. The collected data were analyzed statistically.

Source of Information: International Journal of Sustainable Crop Production, 7 (1): 34-37 (2012)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In Aus season (April-August), 15 cm row spacing is optimum for BRRI dhan42 and BRRI dhan43, and 20 cm row spacing is optimum for BR-26 and BRRI dhan48 for getting maximum grain yield. However, more experiment should be conducted in different locations and seasons to draw a valid conclusion regarding the row spacing.

Knowledge Management: Journal