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Effect of Potassium Fertilizer on Development of Bacterial Blight of Rice

N. Beguma
BCSIR Laboratories, Dhaka,

M. M. Rahman
Institute of Fuel Research and Development(IFRD),

M. A. Bashar
Department of Botany,University of Dhaka,

M. A. Hossain
Bangladesh Rice Research Institute(BRRI), Gazipur,

M. N. Uddin
Planning and Development Division(P&D), BCSIR, Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka-1205, Bangladesh.

Abstract/ Executive Summary:

Effect of five potassium doses viz, recommended dose (RD) (40 kg Murate of Potash(MP)/hector), RD + 10 kg MP/ha, RD + 20 kg MP/ha, RD + 30 kg MP/ha, RD + 40 kg MP /ha to manage bacterial blight of rice were studied during Boro season in 2005. The experiment was laid in Randomized Completely Block Design (RCBD) having three replications. Highest disease severity (55.92%) was observed due to bacterial leaf blight at maximum tillering stage when applied 30 kg MP/ha additional potash. Lowest disease severity (0.45%) of bacterial leaf blight were recorded from the plot where no additional MP was applied but highest yield (4.35 tones/ha) was observed in the plot where additional 20 kg MP/ha was applied. The amount of potassium in the leaves did not vary significantly even after additional application of potassium either 30 or 20 kg MP/ha though it was more (1.31%) when applied 40 kg MP/ha. In another experiment in the present study the lowest disease severity 15.22% and 10.53% were recorded when additional 5kg MP /ha was applied seven days before inoculation at active tillering and panicle initiation stages, respectively. Disease severity was lower in single inoculation compare to multiple inoculations except the plot where 5kg/ha additional potash applied three days before bacterial inoculation. Maximum yield (3.86, 4.38, 4.64 t/ha) was recorded when inoculated at active tillering, panicle initiation and flowering stages separately if potassium was applied seven days before inoculation than those of multiple inoculations. The results suggested that potassium top dressing just before disease initiation was good for higher yield and less disease development. However inoculation in all the growth stages of the crop gave lower yields even potassium application was done at seven or three days before or after inoculation.

Keywords: Bacterial leaf blight, Oryza sativa L., Potassium fertilizer

Location: BRRI

Start Date: 00-12-2004

End Date: 00-05-2005

Program Area: Pest Management

Commodity: Rice

Objectives:

To determine the effect of potassium on the incidence and percent leaf area infection of BLB of rice caused by Xoo.

Methodology:

The experiment was carried out in the field of Plant Pathology Division, Bangladesh Rice Research Institute (BRRI), Gazipur during the transplanted Boro season i,e from December 2004 to May 2005.A modern transplanted Boro rice variety BRRIdhan 29 was used in this experiment The experimental period was December 2004 to May 2005. Seedlings were raised in the seed-bed during the month of December, 2004 and transplanted in the month of January, 2005. Experimental data were collected during the crop growing period, (March-May, 2005). The crops were harvested in May 2005Seed bed preparation and raising of seedlings A small piece (2 m x 3 m) of medium low field of BRRI farm was puddled with the power tiller. The land was marshy and rich in organic matter and no fertilizers were applied to the seedbed. Seeds were collected from the Plant Pathology Division, BRRI, Gazipur. Clean mature and healthy seeds were soaked in tap water for 24 hours. Sprouted seeds were sown uniformly in seedbed on December 2004. The seedbed was protected from birds and animals. Adequate water was applied to the growing seedlings in seedbed as and when required till before transplanting. The seed were then incubated in wet sack for 3 days for germination in room temperature.Experimental design and field layout The experiment was laid out in a Randomized Complete Block Design (RCBD) having three replications for each treatment. Distance between the blocks and between the plots was 50 cm and 25 cm, respectively. There were altogether 15 (Expt.1) and 96 (Expt.2, 3, 4 and 5) plots for the study. Different treatments were assigned randomly to the unit plot (2 m x 1.5 m). Details of the field layout are presented in the following/Next pageLand preparation The main land was opened by power tiller. Later the soils was paddled thoroughly by 3 successive laddering and harrowing. The field layout was made immediately after final land preparation in accordance with the experimental design. The individual plots of each unit plot was then raised so that the fertilizer could not move from one plot to other.

Source of Information: Bangladesh J. Sci. Ind. Res. 46(1), 69-76, 2011

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results suggested that potassium top dressing just before disease initiation was good for higher yield and less disease development. However inoculation in all the growth stages of the crop gave lower yields even potassium application was done at seven or three days before or after inoculation.

Knowledge Management: Journal