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Nitrogen Response Behaviour of Developed Promising Lines of T.aman Rice

P. K. SAHA
Principal Scientific Officer
Soil Science Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701

S. M. M. ISLAM
Senior Scientific Officer
Soil Microbiology Section, BRRI, Gazipur- 1701

M. AKTER
Scientific Officer
Soil Science Division, BRRI, Gazipur-1701

S. K. ZAMAN
Chief Scientific Officer and Head
Soil Science Division, BRRI, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

Nitrogen is the most limiting nutrient for rice. Modern high yielding rice varieties may have differences in accumulating and using N from soil and applied fertilizer. A field experiment with 8 rice genotypes was conducted during 2008 wet season (T.Aman season) to study the effect of different rates of N fertilization on the yield performance and nitrogen nutrition under irrigated condition. Among the tested varieties/lines, BR7155-20-1-3 produced the significantly highest grain yield of 5.04 t/ha at N30 level followed by Swarna (4.66 t/ha) at the same level of N with similar growth duration (140 days). Agronomic efficiency of added N ranged from 0.7 to 23.3 for the promising line BR7155-20-1-3 and 3.3 to 27.0 for variety Swarna. Grain yield at No was the highest in BR7155-20-1-3 followed by the variety Swarna and the lowest in BR7870-5 *(Nils)- I 0-HR8. Percent nitrogen recovery ranged from 50 to 63 for variety Swarna and 13 to 30 for promising line BR7155-20-1-3. The promising line BR7155– 20-1-3 and the variety Swarna may be economically advantageous over the other varieties/ lines.

Keywords: Rice genotypes, Nitrogen uptake, Nitrogen use efficiency, Nitrogen recovery

Location: Bangladesh Rice Research Institute, Gazipur

Start Date: 00-00-2008

End Date:

Program Area: Variety and Species

Commodity: Fertilizer

Objectives:

To determine the N response behaviour of 6 ALART materials viz. BR7155-20-1-3, BR7870-5*(Nils)-2-HR2, BR7870- 5*(Nils)-2-HR8, BR7870-5*(Nils)-7-HR1, BR7870-5*(Nils)-8-HR4, BR7870-5 *(Nils)- 10- HR8 compared with two check varieties viz. Swarna and Guti-swarna.

Methodology:

The field experiment was conducted at the experimental farm of the Bangladesh Rice Research Institute, Gazipur, Bangladesh located at 23°59' N latitude, 90°24 E longitude during 2008 wet season (T.Aman season). The site is about 30 m above the mean sea level and has a subtropical climate, which is strongly influenced by south-western monsoons. The average annual rainfall is 2000 mm with more than 80% of it occurring from mid-June to the end of September. Mean temperature is the lowest (15°C) in January and highest (30°C) in May. The soil of the experimental field is Grey-Terrace (Chhiata series). It is clayloam in texture with pH 6.8. Organic C, total N, available P, and exchangeable K of the soil was 1.1 %, 0.13%, 6.04 ppm, and 0.15 meq /100 g soil, respectively. The available S and Zn (EDTA extracted) of the soil were 6.78 ppm and 2.1 ppm, respectively. Five doses of N i.e. 0, 30, 60, 90, and 120 kg/ha were imposed as treatment. The experiment was laid out in a split-plot design with three replications. Nitrogen doses were assigned in the main plot and the varieties in the sub- plot. Each plot received a blanket dose of P, K, S, and Zn at the rate of 14-56-14-0 kg/ha, respectively, as STB. Six ALART materials viz. BR7155-20- 1-3, BR7870-5*(Nils)-2-HR2, BR7870-5*(Nils)-2-HR8, BR7870-5*(Nils)-7- HRl, BR7870-5*(Nils)-8-HR4, BR7870-5 *(Nils)- 10-HR8 and two check varieties viz. Swarna and Guti-swarna were tested in T.Aman season. Thirty days old seedlings of each material were transplanted at 20cm x 20cm spacing. Nitrogen from urea was applied in three equal splits (1/3 as basal + 1/3 at active tillering stage (22 DAT) + 1/3 at 5-7 days before panicle initiation). Necessary intercultural operations were done as and when required. At maturity, the crop was harvested from 5 m 2 areas at the centre part of each plot and 16 hills were collected for straw yield. The grain yield was recorded at 14% moisture content and straw yield as oven dry basis. Total nitrogen content from plant samples (grain and straw) of two materials (BR7155-20-1-3 and Swarna) was determined by the standard analytical procedure (Yoshida et al., 1976). Data were analyzed as per standard statistical procedure (IRRI, 1998).

Source of Information: Bangladesh J. Agril. Res. 37(2): 207-213, June 2012, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that among the tested materials, BR7155-20-1-3 and Swarna (Ck) produced the highest grain yield at N30 level with the same growth duration (140 days) in T.Aman season.

Knowledge Management: Journal