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Evaluation of N Efficiency Using Prilled Urea and Urea Super Granules in T. Aman Rice

J Hussain
Harvest Plus-Bangladesh, Barisal

M Salim
Department of Agronomy, Bangladesh Agricultural University, Mymensingh.

M A Siddique
Genetic Resources and Seed Division, Bangladesh Rice Research Institute, Gazipur.

M Khatun
Janata Bank Limited, Barisal.

S Islam
Bangladesh Agricultural Development Corporation, Mymensingh.

Abstract/ Executive Summary:

An experiment was conducted at the Experimental field of Department of Agronomy, Bangladesh Agricultural University, Mymensingh, during June to December 2007 to evaluate the nitrogen use efficiency of transplant aman rice using prilled urea (PU) and urea super granule (USG). Three rice varieties (BR11, BRRI dhan30 and BRRI dhan39) were compared at three doses of nitrogen, i.e., PU@125 kg N ha^-1, USG @170 kg N ha^-1 and USG @ 70 kg N ha^-1 in a Randomized Complete Block (RCB) design with three replications. USG each weighing 1 g and 2.6 g were placed manually at the depth of 8-10 cm in the middle of four hills in alternate rows at 12 days after transplanting and PU applied in split applications. The rice var. BR11 at USG @70 kg N ha^-1has produced the maximum grain yield (4.75 t ha^-1) which was statistically identical to BRRI dhan30 at USG @ 70 kg N ha^-1 (1 g pellet^-1). The highest nitrogen use efficiency, partial factor productivity and marginal rate of return (1966%) were recorded from the treatment of BR11 at USG @ 70 kg N ha^-1.

Keywords: Nitrogen use efficiency, Prilled urea, Urea super granule, Transplant aman rice

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-06-2007

End Date: 00-12-2007

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the response of high yielding rice varieties such as to different levels of urea super granules.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during aman season, 2007. The three high yielding rice varieties namely, BR11 (V₁), BRRI dhan30 (V₂), BRRI dhan39 (V₃) and three sources of nitrogen namely prilled urea at the rate of 125 kg N ha^-1 (N₁), One pellet of USG (weight 2.6 g) per 4 hills ≅170 kg N ha^-1(N₂), One pellet of USG (weight 1 g) per 4 hills ≅70 kg N ha^-1 (N₃) were laid out in a factorial randomized complete block design (RCBD) with three replicates. The unit plot size was 10 m² (4.0 m x 2.5 m). At the time of final land preparation, 51.25 kg Triple Super Phosphate (TSP), 60 kg Muriate of Potash (MP), 33.75 kg Gypsum and 5 kg Zinc Sulphate ha^-1 were applied. Nitrogen was applied according to the treatments. Thirty- day- old seedlings were transplanted at the rate of 3 seedlings hill^-1 on the well- puddled plots on 13 th August 2007 maintaining 25 cm x 15 cm spacing. After 12 days of transplanting, one pellet of different sizes (2.6 g and 1 g) USG as a source of nitrogen were placed manually in the root zone at 8-10 cm depth at the centre of four hills of two adjacent rows. Appropriate plant protection measures and management practices were followed throughout the growing period.. The grain yield was adjusted to 14% moisture content. The Agronomic Efficiency of Nitrogen (AEN) was calculated as additional grain yield over the control per kilogram N applied. Data were analyzed and were separated according to Duncan’s Multiple Range test (DMRT).

Source of Information: Bangladesh Agron. J. 2015, 18(1): 59-63

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From all treatment combinations it is clear that USG @ 70 kg N ha^-1 produced more grain yield compared with USG @ 170 kg N ha^-1 and prilled urea. Nitrogen use efficiency, partial factor productivity and marginal rate of return to capital were highest at USG @ 70 kg N ha^-1 compared to USG @ 170 kg N ha^-1 and prilled urea. So, the present N fertilizer recommendation of USG would be 70 kg N ha^-1 to optimize yield, rate of return and N use efficiency of rice varieties BR11, BRRI dhan30 and BRRI dhan39.

Knowledge Management: Journal