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Effect of Nitrogen on Phenology, Light Interception and Growth in Aromatic Rice

K. M. S. HAQUE
MS student
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur 1706, Bangladesh

Q. A. KHALIQ
Professor
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur 1706, Bangladesh

J. AKTAR
MS student
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to study the effect of nitrogen fertilizer on yielding ability of indigenous aromatic rice cultivars under stacking and non-stacking conditions. Rice cultivars were grown during Aman season, 2002. There were four cultivars, namely, Shakkorkhora, Chinigura, Kalijira and Kataribhog, each with three levels of nitrogen fertilizer (0, 60 and 120 kg N ha^-1). Results revealed that during growth period Shakkorkhora with 120 kg N ha^-1 produce the tallest plant and Chinigura without nitrogen application produced the shortest plants. The internode length and culm hollowness significantly increased with the increase in N fertilizer levels. The lodging score was higher with the higher amount of nitrogen fertilizer applied. The cultivar Shakkorkhora remained erect up to 60 kg N ha^-1. Lodging occurred at different stage of grain development, Kataribhog lodged within four days after heading at 120 kg N ha^-1while it took 26 days to lodge at 0 kg N ha^-1. Irrespective of cultivars and nitrogen levels, higher N dose produced higher number of tillers. Leaf area index increased sharply after transplanting attaining a peak at heading stage and then decreased gradually. In non-stacking plant, all the cultivars showed lower LAI at maturity stage than stacking plant. At heading stage the higher light interception was found in all the cultivars with the increment of N levels.

Keywords: Nitrogen, Phenology, Light interception, Aromatic rice

Location: Experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Start Date: 00-00-2002

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To study the effect of nitrogen fertilizer on yielding ability of indigenous aromatic rice cultivars under stacking and non-stacking conditions.

Methodology:

A field experiment was carried out at the experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during the rainy season of 2002. The experimental site is located at the center of Madhupur tract (24^o09^/ N latitude and 90^o26^/ E longitude) having shallow red-brown terrace type soil of Salna series. The soil is characterized by poor fertility and impeded internal drainage. Rice cultivars, Chinigura, Kalijira, Shakkorkhora and Kataribhog were grown with three levels of nitrogen fertilizer (0, 60 and 120 Kg N ha^-1). At the time of heading the experimental plots were equally divided into two parts. The crop in the half of the plot was left on the fate of the nature and that in the other half of the plot was mechanically supported by stacking to prevent lodging. Irrespective of cultivars, the days required to flowering and maturity significantly increased with the increase in the amount of nitrogen applied. The experiment was laid out in a randomized complete block design. Triple Super Phosphate, Muriate of Potash, Gypsum and Zinc Sulphate were applied as the sources of P₂O₅, K₂O, S and Zn, respectively. P₂O₅, K₂O, S and Zn were applied at the rate of 90, 50, 40, and 5 kg ha^-1, respectively. All fertilizers except urea were applied and thoroughly mixed with the soil at the time of final land preparation. Urea was applied as top dressing in three equal installments, first at active tillering stage (18 Days after transplanting), 2nd at maximum tillering stage (35 days after transplanting) and 3rd before panicle initiation stage (50 Days after transplanting). The seedlings were transplanted at 30 days after seeding. One seedling per hill was used maintaining 25 cm row to row and 10 cm plant to plant distance in well prepared land. Weeding, irrigation and application of pesticide were done as and when necessary. Standing water of 2 to 4 cm was maintained in the field until the crop attained hard dough stage. When the panicles of about 50% tillers in each plot were fully headed, the day was recorded as 50% flowering date as days after transplanting (DAT). When the base of the panicles of about 50% tillers in each plots were changed up its color from greenish to brown, then the day was recorded as maturity date as DAT. The total number of tillers per hill was recorded at active tillering, maximum tillering, heading and maturity stages. Leaf area was measured at active tillering, maximum tillering, heading and maturity stages. Light interception was recorded by measuring the incident PAR (photosynthetically active radiation) above and below the canopy by Sunflec ceptometer. The data were analyzed by partitioning the total variance by using MSTAT-C program. The treatment means were computed using Least Significant Difference test and interrelationship was worked out employing regression analysis.

Source of Information: Int. J. Sustain. Crop Prod. 1(2): 01-06, 2006

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Irrespective of cultivars, the days required to flowering and maturity significantly increased with the increase in the amount of nitrogen applied. Lodging occurred at different stage of grain development, Kataribhog lodged within four days after heading at 120 kg N ha^-1while it took 26 days to lodge at 0 kg N ha^-1. Irrespective of cultivars and nitrogen levels, higher N dose produced higher number of tillers. At heading stage the higher light interception was found in all the cultivars with the increment of N levels.

Knowledge Management: Journal