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Nitrogen Doses for Wet-seeded and Transplanted Br14 Rice Variety

Abhijit Saha
BRRI Regional Station, Comilla, Bangladesh.

Nur-E-Elahi
BRRI Regional Station, Comilla, Bangladesh.

M J Abedin
BRRI Regional Station, Comilla, Bangladesh.

M A Quddus
BRRI Regional Station, Comilla, Bangladesh.

T Das
BRRI Regional Station, Comilla, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted to determine optimum nitrogen dose for BR14 rice variety under wet seeding and transplanting methods during Boro 1992 and 1993. The nitrogen doses were 0, 30, 60, 90, 120 and 150 kg N /ha. Optimum dose for better yield was found 90- 120 kg N /ha for both the methods. Irrespective of nitrogen doses, yield was significantly higher in transplanted crop, but the wet-seeded crop matured 10 days earlier.

Keywords: Nitrogen doses , Wet-Seeded,Transplanted , BR14 rice variety

Location: Bangladesh Rice Research Institute , Comilla

Start Date: 00-00-1992

End Date: 00-00-1993

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To compare doses on the yield and N utilization efficiency of BR14 under TP and WS methods

Methodology:

The experiment was conducted In Old Meghna Estuarine Flood Plain Soil (Debidwar series) of Bangladesh Rice Research Institute (BRRI), Comilla during Boro 1992 and 1993. The soil was silty clay . loam having pH 6.2, organic matter 1.31 % and total N 0.10%. The experiment was laid out in a randomized complete block (RCB) design with 4 replications in 1992 and 3 replications in 1993. The performances of a modern variety BR14 was evaluated both under TP and WS methods using six different N doses (0, 30, 60, 90, 120 and 150 kg/ha). For WS method, pregerminated seeds were broadcasted in puddled soil using 80 kg seed/ha. While in TP method, 45 day old seedlings were transplanted at 20- x 20-cm spacing. For both the methods of crop establishment, seeds were soaked on the same day. P, K and S at the rate of 25-35-15 kg /ha were applied as basal during final land preparation. Urea as a source of N was applied in 3 equal splits at 15, 30 and 45 days after transplanting for TP, while in 4 equal splits at 30, 50, 65 and 80 days after sowing for WS method. Necessary intercultural operations were done as and when required. Productive tillers, no. of grains/panicle and 1000-grain weight were recorded from 1 m² area. Grain and straw yield were obtained from a sampling area of 3 m². The grain yield was expressed in t/ha at 14% moisture content. Straw yield was recorded as oven dry basis. Grain and straw samples were analyzed for total N content by micro- kjeldahl method.

Source of Information: Bangladesh Rice J. 6(1&2): 101-104, 1995, ISSN 1025-7330

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Irrespective of establishment methods, grain yield of BR14 increased with the increase in N doses, in both the years.Growth duration increase up to 5 days with the increase in N dose. Total N uptake increased with increasing N doses in both the methods. Irrespective of establishment methods, N rates of 90-120 kg/ha could give optimum grain yield of BR 14 in Bora season. TP method gave significantly higher yield than WS method. However, the crop grown under WS method matured 10-day earlier than TP method.

Knowledge Management: Journal