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Response of Different Level of Nitrogen and Phosphorus on Grain Yield, Oil Quality and Nutrient Uptake of Soybean

A. A. Jahangir
BCSIR Laboratories, Dhaka. Dr.Qudrat-I-Khuda Road, Dhanmondi, Dhaka - 1205. Bangladesh.

R. K. Mondal
BCSIR Laboratories, Dhaka. Dr.Qudrat-I-Khuda Road, Dhanmondi, Dhaka - 1205. Bangladesh.

K. Nada
BCSIR Laboratories, Dhaka. Dr.Qudrat-I-Khuda Road, Dhanmondi, Dhaka - 1205. Bangladesh.

M. A. M. Sarker
BCSIR Laboratories, Dhaka. Dr.Qudrat-I-Khuda Road, Dhanmondi, Dhaka - 1205. Bangladesh.

M. Moniruzzaman
BCSIR Laboratories, Dhaka. Dr.Qudrat-I-Khuda Road, Dhanmondi, Dhaka - 1205. Bangladesh.

M. K. Hossain
BCSIR Laboratories, Dhaka. Dr.Qudrat-I-Khuda Road, Dhanmondi, Dhaka - 1205. Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted to find out the effect to different levels of nitrogen and phosphorus on yield, oil contents and quality and nutrient uptake of soybean. The maximum plant height and number of pod per plant were recorded by the application of 40kg N/ha. Single application of phosphorus also bring significant increased in oil content of soybean. Nitrogen, phosphorus, potash content of soybean seed and straw varied with different treatment of NP. Interaction showed oil content of soybean was influenced with increasing level of nitrogen and phosphorus. The percent of oil and yield of soybean were found maximized by the application of 40kg N/ha + 30kg P₂O₅/ha. However, moisture, density, refractive index and peroxide value of soybean oil remain more or less same throughout the experiment.

Keywords: Nitrogen, Phosphorus, Oil quality, Nutrient content, Grain and Straw yield.

Location: In the Agronomy field of BCSIR, Dhaka

Start Date: 00-00-2004

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soybean

Objectives:

To study the effect of nitrogen and phosphorus on the yield, oil contents and quality and nutrient value of grain and straw of soybean.

Methodology:

The experiment was carried out in the Agronomy field of BCSIR, Dhaka during the winter season, 2004 with soybean (Glycin max L.cv.Shohag). The experiment was carried with three doses each of nitrogen and phosphorus with control treatment. The doses of nitrogen were 20(N1), 30(N2) and 40(N3) kg/ha and those of P were 10(P1), 20(P2) and 30(P3) kg/ha. The source of N and P were urea and triple super phosphate respectively. The unit plot sizes were 2.1m x 2.1 m. The row to row and plant to plant distance were 30cm x 30cm. respectively. The experiment was laid out in randomized block design with three replications. All the intercultural operations such as watering, weeding etc. were done as and when necessary. At the time of harvest, ten plants were selected at random from each unit plot. Yield components were recorded on the selected plants and for yield estimation the whole plot was harvested. The seeds collected from the field were cleaned and sun-dried. The seeds were then crushed in mortar. The oil was extracted in a soxhlet apparatus with light petroleum ether (40-60^O) for about 24 hours. The solvent was removed by rotary evaporator and the percentage of oil content was calculated. Specific gravity, refractive index and acid value were determined by IUPAC standard methods (1979). Nitrogen content was estimated by Kjeldahl method and phosphorus and sulphur sample analyses were digested with HClO₄-HNO₃ acid mixture method of soil analysis (Page et al 1982 ). The collected data were statistically analyzed following the Principles of analysis of variances and the differences among treatment means were adjusted by Duncan's New Multiple Range Test (Steel and Torrie 1960).

Source of Information: Bangladesh J. Sci. Ind. Res. 44(2), 187-192, 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The findings of the study indicate that nitrogen phosphorus fertilizer application improved the yield contributing character efficiency, leading to higher pod yield, oil content and nutrient content of soybean seed. So the further research is needed in this direction with other varieties of soybean to establish the present findings.

Knowledge Management: Journal