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Physiological Attributes of Transplant Aman Rice (cv. BRRI Dhan52) as Affected by Tiller Seedlings and Urea Super Granules

S. K. Paul
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

K. S. Rahman
Department of Agronomy, Bangladesh Agricultural UniversityMymensingh-2202, Bangladesh

M. A. R. Sarkar
Department of Agronomy, Bangladesh Agricultural UniversityMymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh to investigate the effect of age of tiller seedlings, number of tiller seedlings hill-1 and application of urea super granules (USG) on some physiological attributes of transplant Aman rice cv. BRRI dhan52. The experiment consisted of two ages of tiller seedlings viz. 25- and 35-day old, three levels of tiller seedlings hill^-1 viz.1, 3 and 5 seedlings hill^-1and three USG levels viz. 0, 1.8g and 2.7g USG per four hills in every alternate row. The experiment was laid out in a randomized complete block design with three replications. The effect of age of tiller seedlings, number of tiller seedlings hill-1 and USG application were significant on crop growth rate (CGR), relative growth rate (RGR), net assimilation rate (NAR) and leaf area index (LAI). The highest CGR and RGR were found by transplanting 35-day old tiller seedlings during the period at 15-30 and 60-75 DAT when 5 tiller seedlings hill-1 were transplanted. The highest NAR was observed at 60-75 DAT with transplanting 5 tiller seedlings hill-1 and the lowest one was recorded at 30-45 DAT. The highest LAI was found at 35-day old tiller seedlings during the period at 60 and 75 DAT when 5 tiller seedlings hill-1 were transplanted. CGR and RGR were found highest by applying 1.8 g USG at 45-60 and 60-75 DAT while NAR was the highest with application of 2.7g USG at 60-75 DAT and lowest one was found in control (0 g USG) at 45-60 and 60-75 DAT. The highest LAI was found by applying 1.8g USG at 15, 30, 45 and 60 DAT and the lowest one was found at 60 DAT in control and at 15, 30 and 45 DAT when 2.7g USG was applied. The highest LAI and CGR were found in older tiller seedlings (35- day old) by transplanting five tiller seedlings hill^-1 fertilized with 1.8g USG whereas the highest RGR and NAR were obtained in younger tiller seedlings (25-day old) by transplanting single tiller seedling hill^-1 fertilized with 1.8g USG per four hills of every alternate row.

Keywords: Physiological attributes, Tiller seedlings, USG, Transplant Aman rice

Location: The Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To analyse different growth parameters viz. crop growth rate (CGR), relative growth rate (RGR), net assimilation rate (NAR) and leaf area index (LAI) when separated tillers were used as planting materials as an alternative of nursery seedling of transplant Aman rice.

Methodology:

A field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh. The land was medium high with sandy loam texture having pH 6.4. BRRI dhan52, a high yielding modern rice variety of transplant Aman rice, developed by the Bangladesh Rice Research Institute, was used as the test crop. The experiment comprised two ages of tiller seedlings viz. 25 and 35-day old (tillers were separated manually from previously grown mother crop at 25 and 35 days after transplanting), three levels of tiller seedling hill-1 viz.1, 3 and 5 seedlings hill-1 and three USG levels viz. 0, 1.8g and 2.7g USG per four hills in every alternate row. There were 18 treatments combinations. The experiment was laid out in a randomized complete block design with three replications. Each block was divided into 18 unit plots where 18 treatment combinations were allocated at random. There were 54 unit plots in the experiment. The size of unit plot was 4.0m × 2.5m. The experimental plots were fertilized with triple super phosphate, muriate of potash, gypsum and zinc sulphate @ 100, 70, 60, 10 kg ha-1. The entire amounts of triple super phosphate, muriate of potash, gypsum and zinc sulphate were applied at final land preparation. Nitrogen was applied according to experimental specification in the form of Urea Super Granules (USG) per four hills in every alternate row at 10 days after transplanting. Physiological attributes such as LAI, CGR, RGR and NAR were calculated.

Source of Information: Progress. Agric. 24(1 & 2): 17 – 27, 2013 ISSN 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest LAI and CGR were found in older tiller seedling by transplanting 5 tiller seedlings hill^-1 fertilized with 1.8g USG. The highest RGR and NAR were obtained in younger tiller seedling by transplanting single seedling hill-1 fertilized with 1.8g USG per four hills of every alternate row.

Knowledge Management: Journal