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Effect of Seed Rate and Nitrogen Level on the Yield of Direct Seeded Hybrid Boro Rice

M. Anisuzzaman
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

M. Salim
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

M.A.H. Khan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

A field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from January to May 2009 to evaluate the effect of seed rates and nitrogen levels on the yield of direct seeded hybrid boro rice. The experiment consisted of five seed rates viz., 9 kg ha^-1, 12 kg ha^-1, 15 kg ha^-1, 18 kg ha^-1, and 21 kg ha^-1 with three nitrogen levels viz., 100 kg ha^-1, 120 kg ha^-1 and 140 kg ha^-1. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The total number of effective tillers hill^-1, number of grains panicle^-1, grain yield, biological yield and harvest index were observed highest with 15 kg seed ha^-1. Again plant height, number of effective tillers hill-1, number of grains panicle^-1, grain yield, straw yield and biological yield were found highest with140 kg N ha^-1. The highest total number of effective tillers hill^-1 and highest grain yield were observed in the treatment combination of 15 kg seed ha^-1 and of 140 kg N ha^-1. It was revealed that 15 kg seeds ha^-1 with 140 kg N ha^-1 was found to be adequate to produce maximum yield of direct seeded hybrid boro rice.

Keywords: Seed rate, Nitrogen level, Direct seeded rice, Hybrid boro rice

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-01-2009

End Date: 00-05-2009

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To identify the optimum level of nitrogen for obtaining higher yield from direct seeded hybrid boro rice, 2. To identify the optimum seed rate to get optimum plant density for higher yield, and 3. To determine the most suitable combination of seed rate and nitrogen level for obtaining higher yield from direct seeded hybrid boro rice.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from January to May 2009 to determine the appropriate seed rate and the optimum level of nitrogen for higher yield of hybrid boro rice cv. Raichar-101. The land was medium high and the soil was silty loam. The pH value of the soil was 6.5. The soil was low in organic matter content and in fertility level. Status of phosphorus and cation exchange capacity (CEC) were medium and that of potassium was low. The experiment consisted of five seed rates viz., 9 kg ha^-1, 12 kg ha^-1, 15 kg ha^-1, 18 kg ha^-1, and 21 kg ha^-1 with three nitrogen levels viz., 100 kg ha^-1, 120 kg ha^-1 and 140 kg ha^-1. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Plot to plot distance was 0.5 m and block to block distance was 0.75 m. There were 45 plots and unit plot size was 4.0 m x 2.5 m. The phosphatic, potassic, sulphur, zinc and bron fertilizers were applied in the forms of Triple super phosphate, Muriate of potash, Gypsum and Zinc Sulphate at the time of final land preparation. Urea as per experimental specifications was top dressed in three equal splits at 15, 35, 55 days after sowing. The sprouted seeds were sown by broadcasting on as per experimental specifications. Intercultural operations like irrigation and drainage, weed management and pest control were done whenever necessary. Maturity of the crop was determined when about 90 percent of the seeds were turned into golden color. Plants of 1 m² were selected randomly from each unit plot excluding border rows for collecting data on plant characters of rice. The harvested crop of each plot was separately bundled, properly tagged and then brought to the threshing floor. The grains were then threshed, cleaned, sun dried and weighed to record the grain yield. The grain yield was adjusted to 14 percent moisture content. Straw were similarly sun dried and weighed to record the straw yield. Grain and straw yields were finally expressed as t ha^-1. The collected data were analysed statistically. The analysis of data was done following MSTAT programme by computer. The mean differences among the treatments were adjudged with Duncan’s Multiple Range Test.

Source of Information: J. Agrofor. Environ. 4 (1): 77-80, 2010; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Based on the result of the study, it may be concluded that the effects of seed rates and nitrogen levels treatments were highly significant. A seed rate of 15 kg ha^-1 and nitrogen at the rate of 140 kg ha^-1 should be used in case of direct seeded hybrid boro rice cv. Raichar-101.

Knowledge Management: Journal