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Field Performance of Rhizobial Inoculants on Lentil

M Asadul Haque Bhuiyan
Senior Scientific Officer, Soil Science Division, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

Delowara Khanam
Principal Scientific Officer, Soil Science Division, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh;

M Eyakub Ali
Scientific Officer, Soil Science Division, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh;

Fardul Alam
Scientific Officer, Soil Science Division, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh;

M Arifur Rahman
Scientific Officer, Soil Science Division, Regional Agricultural Research Station, Jamalpur, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted at Regional Agricultural Research Station (RARS), Jamalpur during rabi season of 2005-2006 and 2006-2007 to find out the effectiveness of Rhizobium strains on lentil. BARI Masur– 4 and Rhizobium inoculum (strains BARI RLc-104, BARI RLc-105, BARI RLc-106 and BARI RLc-107) were used in this experiment. Unit plot size was 4 m x 3 m. The experiment was designed in randomized complete block having 4 replications for each treatment. There were six treatments, T₁: Rhizobium strain BARI RLc- 104, T₂: Rhizobium strain BARI RLc-105, T₃: Rhizobium strain BARI RLc-106, T₄: Rhizobium strain BARI RLc– 107, T₅_: mixed culture of the above four strains and T₆: control. The strains were used to prepare peat based rhizobial inocula which were used @ 1.5 kg ha^-1. A basal dose of P, K, S, Zn @ 22, 42, 20, 5 kg ha^-1, respectively for all treatments were used in the experiment. Plant receiving peat based rhizobial inocula (strain BARI RLc-104, BARI RLc-105, BARI RLc-106, BARI RLc-107 and mixed culture) produced significantly higher nodule number, nodule weight, stover yield and seed yield over non-inoculated control. The highest nodule number (12.84 plant^-1in 2006 and 12.30 plant^-1 in 2007) and nodule weight (10.51 mg plant^-1 in 2006 and 13.53 mg plant^-1 in 2007) were found with strain BARI RLc-104. This strain also recorded the highest seed yield (1.23 t ha^-1, 55.7% higher over non-inoculated control) in 2006 but BARI RLc-107 produced the highest seed yield (1.20 t ha^-1, 50.0% higher over non-inoculated control) in 2007 though all the strains including mixed culture recorded identical yields.

Keywords: Rhizobium, Lentil, Nodulation, Yield

Location: RARS, Jamalpur

Start Date: 00-00-2005

End Date: 00-00-2007

Program Area: Variety and Species

Commodity: Lentil

Objectives:

To find out the effectiveness of some Rhizobium strain/(s) on lentil at RARS Jamalpur.

Methodology:

A field experiment was conducted at Regional Agricultural Research Station (RARS), Bangladesh Agricultural Research Institute (BARI), Jamalpur under Old Brahmaputra Floodplain Soils and in Agro-ecological Zone 09 during rabi season of 2005-2006 and 2006-2007 to find out the effectiveness of Rhizobium strains on lentil. The initial soil sample of the experimental field was collected and analyzed following standard procedures in the laboratory. The soil was neutral (pH 7.00) having low organic matter (0.47%). The content of total-N and exchangeable K was very low. The available phosphorus, sulphur and boron content were medium while zinc was low. The initial rhizobial population of the soil was below 103. The experiment was laid out in randomized complete block design considering four replications. The unit plot size was 4 m × 3 m. The variety BARI Masur–4 of lentil and peat based rhizobial inocula BARI RLc-104, BARI RLc-105, BARI RLc-106 and BARI RLc-107 were used for the experiment. There were six treatments, T₁: Rhizobium strain BARI RLc-104, T₂: Rhizobium strain BARI RLc-105, T₃: Rhizobium strain BARI RLc-106, T₄_: Rhizobium strain BARI RLc–107, T₅: mixed culture of the abovefour strains and T6: control. The above peat based rhizobial inocula containing 108 cells g-1 inoculum were used @ 1.5 kg ha^-1. Chemical fertilizers i.e. P, K, S and Zn were applied in all treatments as basal dose at 22 kg P ha^-1 from triple superphosphate, 42 kg K ha^-1 from muriate of potash, 20 kg S ha^-1 from gypsum and 5 kg Zn ha^-1 from zinc oxide. Lentil was sown on 21 November 2005 and 16 November 2006 with a spacing of 30 cm x 10 cm. During the course of the experiment, growth and development of plants in the field were carefully observed. Ten randomly selected plants along with roots were collected at 50% flowering stage from each unit plot and dry weight of roots, shoots and nodules including nodule numbers were recorded. The plants were harvested on 02 March 2006 and 09 March 2007. Data on plant height, 1000-seed weight, stover yield and seed yield were also taken plot wise and expressed on hectare basis. All data were analyzed statistically.

Source of Information: Bangladesh J Microbiol, Volume 27, Number 1, June 2010, pp 18-21

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Plant receiving peat based rhizobial inocula (strain BARI RLc-104, BARI RLc-105, BARI RLc-106, BARI RLc-107 and mixed culture) produced significantly higher nodule number, nodule weight, stover yield and seed yield over non-inoculated control. The highest nodule number (12.84 plant^-1in 2006 and 12.30 plant^-1 in 2007) and nodule weight (10.51 mg plant^-1 in 2006 and 13.53 mg plant^-1 in 2007) were found with strain BARI RLc-104. This strain also recorded the highest seed yield (1.23 t ha^-1, 55.7% higher over non-inoculated control) in 2006 but BARI RLc-107 produced the highest seed yield (1.20 t ha^-1, 50.0% higher over non-inoculated control) in 2007 though all the strains including mixed culture recorded identical yields

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