Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Response of Nitrogen on Yield and Seed Quality of Boro Rice

Amina Khatun
Rice Farming System Division, Bangladesh Rice Research Institute, Gazipur 1701.

M. S. U. Bhuiya
Professor
Agronomy Department, Bangladesh Agricultural University, Mymensingh.

M. A. Saleque
Coordinator for Advanced Studies and Research, Bangladesh Rice Research Institute, Gazipur 1701.

Abstract/ Executive Summary:

Nitrogen (N), the most limiting nutrient in Bangladesh, for rice has been studied most rigorously, but its contribution to rice seed production remained relatively unexplored. An experiment was conducted during Boro season (November-April) in 2009-10 at the Bangladesh Rice Research Institute experimental farm, Gazipur, Bangladesh, to evaluate the effect of N fertilizer on seed yield and its quality. The experiment included BRRI dhan28 and BRRI dhan29 and 0, 50, 100, 150, 200 and 250 kg ha ^-1 N rates. Seed yield increased significantly in a quadratic fashion with the increase of N rate both in BRRI dhan28 and BRRI dhan29. Application of N fertilizer increased seed yield by about 3-4 t ha ^-1 compared to control. The highest yield of 5.15 and 6.34 t ha^-1 was obtained with 150 kg N ha ^-1 in BRRI dhan28 and BRRI dhan29 respectively. However, the predicted economic optimum doses of N appeared as 156 and 158 kg ha ^-1 for BRRI dhan28 and BRRI dhan29 respectively. Nitrogen application to rice seed crop did not impair seed quality in terms of germination, viability, vigour and seed color. The seed N concentration ranged from 0.94 to 1.31% in BRRI dhan28 and 0.85 to 1.07% in BRRI dhan29 among different N rates. The seed phosphorus concentration varied from 0.30 to 0.41% in BRRI dhan28 and 0.28 to 0.36% in BRRI dhan29 among different N rates. The seed K varied from 0.23 to 0.27% and 0.20 to 0.23% in BRRI dhan28 and BRRI dhan29 respectively, among different N rates. The average seed protein of BRRI dhan28 (6.59%) was significantly higher than that of BRRI dhan29 (5.68%). Seed N and protein content slightly increased with the increase of N rate. Nitrogen application did not influence phosphorus and magnesium content in rice seed. However, seed potassium slightly decreased with the N application.

Keywords: Rice , Seed yield, Seed quality, Nitrogen rate

Location: Bangladesh Rice Research Institute, Gazipur, Bangladesh

Start Date: 00-11-2009

End Date: 00-04-2010

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Rice

Objectives:

To determine the optimum dose of N on yield and seed quality of Boro rice and seed nutrient composition of rice under varying levels of N application.

Methodology:

The soil of the experimental field is Chhiata clay loam, a member of the fine, hyperthermic Vertic Endoaquept. The initial soil chemical properties at 0-15 cm soil depth were: pH 6.1, organic matter 2.02%, total N content 0.07%, available P 10.14 mg kg^–1 (0.5 M NaHCO₃ extracted), exchangeable K 0.17 meq/100 g soil (Neutral 1.0 N NH₄ OAc extracted), available sulfur (S) 20 mg kg^–1 [Ca(H₂PO₄ )₂ extracted], and available Zn 2.8 mg kg^–1 (0.01N HCl extracted). The experiment involved two factors, rice variety and N rate. Two rice varieties, BRRI dhan28 and BRRI dhan29 were grown under irrigated conditions during Boro season. The tested N rates were 0, 50, 100, 150, 200 and 250 kg ha ^-1 . Rice was transplanted in the first week of January 2012 with 40-day-old seedlings. Two or three seedlings were transplanted with 20- × 20-cm spacing. The experiment was conducted in a randomized complete block design with three replications. Unit plot size was 5- × 4-m. All plots were surrounded by soil levees of 30 cm high to avoid N contamination between plots. Nitrogen was applied as urea in three equal splits: 20, 35 and 50 days after transplanting (DAT) for BRRI dhan28 and 20, 35 and 55 DAT for BRRI dhan29. Phosphorus, K, S and Zn were applied as triple super phosphate, muriate of potash, gypsum and zinc sulphate respectively, during final land preparation. After transplanting, intercultural operations like weeding, irrigation and control of pest were done as and when necessary. At maturity the crop was harvested manually at 15 cm above ground level. However, 16 hills from each plot were harvested at the ground level for measuring yield components and straw yield. The grain yield was recorded at 12% moisture content and straw yield as oven dry basis following standard procedures as described. Optimum dose of N was determined by differentiating the quadratic N response equation. The grain number panicle^-1, 1000-grain weight (TGW) was measured at 12% moisture and sterility (%) was calculated. Rice plants from 5 m² area of the middle of each plot were harvested at above ground level and threshed for grain yield determination. The quality of the freshly harvested rice seeds were assessed by seed germination, seed viability and seedling vigour test. Seedling vigour was tested following two methods: 1) speed of germination and 2) seedling length measurement. Germination count was made according to ISTA. The N, P, K and Mg concentrations in seed grain were determined. Seed protein content was calculated by multiplying the N content in seeds by a factor of 5.95. The seed colour was determined by Munsell Color Chart. Analysis of variance (ANOVA) of the measured parameters was performed and the treatment means were compared using Least Significant Difference (LSD) at the 5% level of probability (Gomez and Gomez, 1984).

Source of Information: Bangladesh Rice J. 18(1&2): 24-32, 2014

Article Link (Online Journal): http://brri.portal.gov.bd/sites/default/files/files/brri.portal.gov.bd/page/ebfaa7b3_6c6d_4a9f_af2a_5180740a1f09/4-BRJ.pdf

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

BRRI dhan29 produced about 1 t ha ^-1 more seed than the BRRI dhan28, the N requirement for both the varieties was 164 kg ha ^-1 . Nitrogen application to rice seed crop did not impair seed quality in terms of germination, viability, vigour and seed colour. However, a slight difference in N, P, K and Mg contents due to N management resulted in little variation in the seed qualities of the tested varieties. Popular belief in the deterioration of seed quality due to the application of chemical fertilizer seems to have little acceptability.

Knowledge Management: Journal