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Effect of Crop Establishment Method and Time of Nitrogen Application on the Productivity of Boro Rice in Highland Ecosystem

M. H. Kabir
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

M. S. U. Bhuiya
Dept. of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

Nur-E-Elahi
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

M. H. Rashid
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to study the effect of crop establishment methods and time of nitrogen application in Boro rice at the Bangladesh Rice Research Institute (BRRI) experimental farm, Gazipur during Boro season (2004-05). Five establishment methods viz; line sowing in zero tilled, broadcasting in zero tilled, line sowing in tilled, broadcasting in tilled wet soil and transplanting method and three times of nitrogen application viz; three splits of nitrogen application at 20, 40 and 85 DAS, four splits of nitrogen application at 20, 40, 60 and 85 DAS and leaf colour chart based nitrogen application methods were investigated. Line sowing in tilled wet soil gave the highest number of tiller m^-2, panicles m^-2, grains m^-2, grain yield, straw yield, gross return, gross margin and less variable cost compared to other direct seeding and transplanting methods. In case of time of nitrogen application, four splits of nitrogen application gave the highest number of tiller m^-2, panicles m^-2, grains m^-2, grain yield, straw yield, gross return, gross margin compared to other nitrogen application techniques.

Keywords: Crop establishment method, Boro rice, Variable cost and Time of nitrogen application

Location: Bangladesh Rice Research Institute, Gazipur.

Start Date: 00-00-2004

End Date: 00-00-2005

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Rice

Objectives:

To evaluate the performance of different crop establishment methods and to find out the optimum time of nitrogen application in Boro rice under highland ecosystem.

Methodology:

The experiment was conducted at the Bangladesh Rice Research Institute (BRRI) experimental farm, Gazipur during Boro season, 2004-05 in highland ecosystem. Five crop establishment methods viz; line sowing in zero tilled, broadcasting in zero tilled, line sowing in tilled, broadcasting in tilled wet soil and transplanting method with BRRI recommended times of nitrogen application (at 15, 45 and 55 DAT) and three time of nitrogen application viz; three splits of nitrogen application at 20, 40 and 85 DAS, four splits of nitrogen application at 20, 40, 60 and 85 DAS and leaf colour chart based nitrogen application methods were applied in factorial randomized complete block design with three replications. The size of the unit plot was 5 x 6 m. The modern rice variety BRRI dhan29 was used as the experimental crop. In zero tilled method, the land was soaked for two days and weeds were removed by hand and then the land was leveled by laddering before two days of sowing. In case of tilled method, the land was soaked and three ploughings were done by power tiller followed by two laddering before two days of sowing. Transplanting was done as usual in puddled soil. N, P₂O₅, K₂O, Sand Zn were applied at 120, 15, 40, 10 and 2 kg ha^-1 as were urea, triple super phosphate (TSP), muriate of potash (MP), gypsum and zinc sulphate (ZnSO₄), respectively. The whole amount of TSP, MP, gypsum and ZnS0₄ were applied at the time of final land preparation. Seed rates were 40 kg ha^-1 and 30 kg ha^-1 for direct seeding and transplanting method, respectively. The sprouted seeds were sown in lines by drum seeder in single thin row and broadcast by hand in zero tilled and tilled wet soil. At the same day the sprouted seeds were sown in seedbed for raising seedlings for transplanting method. The spacing "18 cm x continuous" was used in lines by drum seeder and 20 x 20 cm spacing were used for transplanting method. Six days after sowing, two inches irrigation was and herbicide (Ron star) was applied at the rate of one liter ha^-1. The data on tilIers m^-2, weed density and weed dry biomass, effective tillers m^-2at maturity, plant height, date of maturity, panicles m^-2, grains m^-2, grain yield, straw yield, cost of land preparation, labour, inputs, irrigation and price of the products and byproducts were recorded. Statistical analysis was done as least significance difference (LSD) using IRRISTAT.

Source of Information: The Agriculturists, Vol: 5, (No-1&2), pp: 67-76, Dec 2007

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Line sowing in tilled wet soil method gave the highest number of tillers m^-2, number of grains m^-2, grain and straw yields, gross income and gross margin to other crop establishment methods. In case of time of nitrogen application, four splits of nitrogen application (at 20, 40, 60 and 85 DAS) gave the highest number of tillers m^-2, number of grains m^-2, grain and straw yields, gross income and gross margin followed by Leaf color chart based (LCC) nitrogen application. So, line sowing in tilled wet soil method with four splits of nitrogen and Leaf color chart (LCC) based nitrogen application may be the best for Boro rice production in highland ecosystem.

Knowledge Management: Journal