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Effect of Different Forms and Rates of Urea on the Growth and Yield of Transplant Aman Rice

M.A.A Mahbub
Plant Physiology Division, Bangladesh Rice Research Institute, Gazipur-1701

A.U. Sarkar
Department of Agronomy Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M.J.U Chowdhury
Farm Management Division, Bangladesh Rice Research Institute, Gazipur-1701

Abstract/ Executive Summary:

An experiment was conducted at the Bangladesh Agricultural University, Mymensingh, during the transplant aman season, 1998 to observe the effect of different source and rates of urea nitrogen on the growth and yield of transplant aman rice. The urea forms and rates were i. control (no nitrogen) il. Prilled urea (PU) at the rate of 35 kg N ha^-1 iii. PU at the rate of 70 kg N ha^-1 iv. Urea supergranule (USG) at the rate of 35 kg N ha^-1 v. USG at the rate of 70 kg N ha^-1 and the cultivar BR11 and Binashail were used for the study. The results showed that USG at the rate of 35 kg N ha^-1 gave the highest grain yield (4.76 t ha^-1 than other nitrogenous fertilizers with their respective doses for both the varieties. Tallest plant (133.46 em) and longest panicle (26.84 cm) were produced by the USG at the rate of 70 kg N ha^-1 with Binashail. The other growth and yield characters i.e., tillers hill^-1, bearing and nonbearlng tillers hill^-1 and grains panicle^-1, were favourably influenced by the USG at the rate of 35 kg N ha^-1 with BR11. Marginal analysis showed that, the gross returns and marginal rate of return (MAR) were highest in USG at the rate of 35 kg N ha^-1 which showed a gradual decrease with the increase rate of nitrogenous fertilizers.

Keywords: Forms, Rates, Urea and T. Aman rice

Location: Agronomy field laboratory of he Bangladesh Agricultural University, Mymensingh

Start Date: 01-07-1998

End Date: 30-12-1998

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To determine a suitable forms and rates of urea for higher yield of rice.

Methodology:

The experiment was conducted at the Agronomy field laboratory of he Bangladesh Agricultural University, Mymensingh, during transplant aman season, 1998. The experiment consisted of two factors viz. (a) forms and rates of urea and (b) variety. The urea forms and rates were i. control (no nitrogen) ii. PU at the rate of 35 kg N ha^-1 iii. PU at the rate of 70 kg N ha^-1 iv. USG at the rate of 35 kg N ha^-1 v. USG at the rate of 70 kg N ha^-1 and cv. BR11 and Binashail were used for the study. The e:xperiment was laid in a Randomized Complete Block Design with three replication having a unit plot size of 4m x 2.5 m. spaced at 25 x 15 em using two to three seedlings ha^-1. Two forms of urea nitrogen eg. prilled urea and urea super granule were applied. Prilled urea were applied in three equal splits at 10, 30 and 50 DAT and USG placed at 8 to 10 cm depth in the center of 4 hills in alternate rows at 7 DAT. In control plots, nitrogen fertilizer was not applied. Data on growth, yield and yield components were recorded from 10 randomly selected plants for each plot. The crop was harvested plot wise at 80% maturity. The yield of grain and straw were recorded after threshing, winnowing and drying at 14% moisture content. Recorded data were analyzed statistically with the help of computer package MSTAT and the mean differences were adjudged with Duncan's New Multiple Range Test (Gomez and Gomex, 1984).

Source of Information: Bangladesh J. Agril. Sci. 29 (1): 31-38, January, 2002

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

These results revealed that, USG gave significantly better response than PU for both the varieties, Better response in growth characters and N uptake were found by USG at the rate of 70 kg N ha^-1 and in yield characters by USG at the rate of 35 kg N ha^-1 and these were agreed with those of Sarder et al., (1988) and Rajgopalan and Palanisamy (1985). From marginal analysis· it was observed that, the yield and gross returns were highest in USG @ 35 kg N ha^-1. But it is desirable to maximize the return up to the highest economic threshold with limited resources. Therefore, the marginal analysis has done to find out the highest marginal rate of returns (MRR) and It was fond that MAR was highest (1083%) with the USG, applied at the rate of 35 kg N ha^{- 1} .

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