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Effects of Variety, Inoculum and Phosphorus on the Performance of Soybean

M.K Islam
Breeder Seed Production Centre, Agricultural Research Station, Debigonj, Panchagar, Bangladesh.

M.A.A. Mondal
Soil Resources Development Institute, Bogra, Bangladesh.

M.A. Mannaf
On-Farm Research Division, Agricultural Research Station, Rangpur, Bangladesh.

M.A.A. Mondal
Breeder Seed Production Centre, Agricultural Research Station, Debigonj, Panchagar, Bangladesh.

M.A.H. Talukder
On-Farm Research Division, Agricultural Research Station, Rangpur, Bangladesh.

M.M. Karim
Department of Agronomy, Agricultural University, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

Effects of Bradyrhizobium inoculum and phosphorus on the soybean were studied through an experiment at the Agronomy Field Laboratory of the Bangladesh Agricultural University, Mymensingh during August 26 to November 30, 2001. The purpose was to observe the performance of soybean varieties using Bradyrhizobium inoculum and phosphorus fertilizer and thereby to select suitable soybean variety(s) with determined optimum dose of inoculum and phosphorus. Three varieties of soybean v iz., Shohag (ph-I), BS60 and BS16 were tested using two levels of Bradyrhizobium inoculum viz., 0 and 30 g kg^-1seed and three levels of phosphorus viz., 60, 72 and 84 kg P₂O₅ha^-1in a split plot design with four replications The varieties were accommodated in main plots and six combinations of inoculum and P₂O₅ were assigned to the sub plots. The single effect of variety, inoculum and phosphorus indicated that significantly the highest seed and stover yield was obtained from Shohag, using inoculum and higher dose of phosphorus. The combined effect of variety and inoculum was significant in respect of branches per plant, seed per plant, empty pod per plant, nodules per plant and seed yield and that of variety and phosphorus was significant only in case of empty pod per plant, nodules per plant and seed yield. That is the seed yield, nodules and seed per plant of Shohag increased with inoculum and higher dose of phosphorus except empty pod per plant in both the cases. Though there was no significant differences in respect of all the characters studied except empty pod per plant and nodules per plant due to combined effect of inoculum and phosphorus and variety, inoculum and phosphorus an increased trend was observed in all the studied characters except empty pod per plant. However the variety, Shohag gave the highest seed yield (2.29 t ha^-1) using inoculum and the highest dose (84 kg ha^-1) of P₂O₅. The over all results implied that the variety, Shohag in cornbination with inoculum at the rate of 30 g kg^-1 seed and 84 kg P₂0₅ ha^-1 could be grown for higher yield of soybean by planting in August in puddle soil .

Keywords: Soybean, Bradyrhizobium inoculum, Phosphorus fertilizer, Higher yield

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 26-08-2001

End Date: 30-11-2001

Program Area: Crop-Soil-Water Management

Commodity: Soybean

Objectives:

To observe the performance of soybean varieties on inoculum and phosphorus fertilization
To select a suitable soybean variety(s) with optimum dose of inoculum and phosphorus for profitable yield.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, from 26 Aug. to 30 N ov. 2001. The experimental area belonged to the Agro Ecological Zone of Old Brahmaputra Floodplain (AEZ-9) having loamy soil. The pH, organic matter and available phosphorus content of the soil were 6.7, 1.19 and 16 ppm, respectively. The experiment was laid out in a split plot design with four replications. Three varieties (V) of soybean viz., Shohag (V₁), BS 60 (V₂) and BS 16 (V₃) were tested with six combinations of Bradyrizobium inoculum (I) and phosphorus (P). There were two levels of inoculum (I₀: No inoculum and I₁: 30 g inoculum for 1 kg seed) and three levels of phosphorus (P₁: 60 kg P₂O₅ ha^-1, P₂: 72 kg P₂O₅ ha^-1 and P₃: 84 kg P₂O₅ ha^-1). The three varieties were accommodated in main plots and the six combinations were assigned to the sub plots. The unit plot size was 4x2 m. The land was opened with a power tiller and then ploughed twice with country plough. The weeds and stubbles were removed by hand. Rainwater was trapped by making ridge with spade along the perimeter of the experimental field and subsequently the land was puddled well with power tiller. After puddling there was no standing water in the field The land was un.iformly fertilized with 10 kg Nand 60 kg K₂O ha^-1 at the time of final land preparation. P₂O₅ was applied as per treatment in individual plots. Seeds of the three varieties of soybean and Bradyrhizobium inoculum were collected from the Department of Genetics and Plant Breeding, Bangladesh Agricultural University and the Bangladesh Institute of Nuclear Agriculture, Mymensingh, respectively. The seeds of each variety were mixed with molasses and then treated with Bradyrhizobium inoculum at the rate of 30 g kg^-1 of seed to develop proper coating. The treated seeds were sown on 26 Aug., 2001 on the puddled soil in 40 cm apart rows maintaining 5 cm spacing from seed to seed. Intercultural operations such as gap filling, weeding, soil loosening, disease and pest management, etc. were performed uniformly in all plots. Weeding was done three times at 15, 30 and 45 days after sowing. Necessary plant protection measures were taken as and when required. The crop was harvested at full maturity on 23 and 30 N ov., 2001. The variety BS60 and BS16 were matured 7 days earlier in all plots than the variety, Shohag. Data on number of nodules plant^-1, plant height., number of branches plant^-1, length of pod, number of effective pods plant^-1, number of empty pods plant^-1, number of seeds pod^-1, 1000-seed weight, seed yield and stover yield were collected and analyzed and mean differences were adjusted by DMRT.

Source of Information: Pakistan Journal of Biological Sciences 7 (12): 2072-2077, 2004 (ISSN 1028-8880)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The result of the experiment indicated that, higher dosage of phosphorus along with inoculum produced higher yield in all the three tested varieties of which Shohag gave the maximum yield. Therefore, it could be recommened that, by August planting, the variety, Shohag could be grown using inoculum along with 48 kg P₂O₅ ha^-1 for higher seed yield of soybean.

Knowledge Management: Journal