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Effect of Rate of Arbuscular Mycorrhiza Inoculum on the Performance of Vegetable and Spices Crop Seedlings

D. Khanam
Principal Scientific Officer (Ex.)
Soil Science Division, BARI, Joydebpur, Gazipur

M.E. Ali
Senior Scientific Officer
Soil Science Division, BARI, Joydebpur, Gazipur

M.M. Rahman
Director
T&C BARI, Joydebpur, Gazipur-1701 Bangladesh

Abstract/ Executive Summary:

In 2004-2005, three experiments on the effect of rate of arbuscular mycorrhiza inoculum in producing tomato, brinjal and chilli seedlings were conducted in the seedbed of Soil Science Division, BARI, Gazipur during rabi season 2004-05. Seven rates of AM inoculum viz. 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 kg m^-2 were studied. Cowdung and TSP were used at the rate of 5 kg and 15 g per m2. Seeds were sown in 10 cm apart solid lines during the first week of January, 2005 and the seedlings were thinned down to about 3 cm from seedling to seedling within a week of germination. Biomass yield, seedling height and nutrient uptake by tomato, brinjal and chilli seedlings increased greatly with the use of AM inoculum. Biomass yield of tomato and chilli seedlings was found quadratic trend and that of brinjal seedlings followed linear trend with the increase of AM inoculum rate from 0 to 3.0 kg /m2. Dry weight and growth of seedlings was improved greatly with AM inoculation. Uptake of all the major nutrients was also improved greatly with AM inoculation. The response curve reveals that 2.0 kg AM inoculum/m² produced the highest dry weight of tomato seedlings.

Keywords: Tomato, yield, uptake, root colonization

Location: BARI, Joydebpur, Gazipur

Start Date: 01-11-2004

End Date: 30-04-2006

Program Area: Crop-Soil-Water Management

Commodity: Tomato, Brinjal, Chilli

Objectives:

To observe the effect of different rates of AM inoculum on the performance of different vegetable and spices crop seedlings.

Methodology:

The experiment on the effect of different rates of AM inoculum on tomato seedlings was conducted in the seedbeds (3 m × 1 m) of Soil Science Division, BARI, Gazipur during rabi 2004-05 and 2005-06. Silted soil from the bank of Turag river at Kodda, Gazipur was used in the seedbed. The soil was slightly alkaline in reaction. Organic matter, major nutrients and zinc and copper contents of the soil were low, while boron and manganese levels were quite high. The soil contained 12 AM spores of indigenous mixed AM fungal species and the experiment was conducted under un-sterilized soil condition.The experiments were laid out in RCB design with three replications. Seven rates of AM inoculum viz. 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 kg/m² were studied on tomato seedlings. Cowdung and TSP were used at the rate of 5 kg and 15 g per m². No other fertilizers were used. Seeds were sown in 10 cm apart solid lines during the first week of January and first week of December in the first year and second year respectively. Soil based AM inoculum was used in the seed furrows of about 3 cm depth. A soil layer of about 1 cm thickness was spread on the inoculum layer on which the seeds were sown. Tomato variety Ratan was used as the test crop. The seedlings were thinned down to about 3 cm from seedling to seedling within a week of germination. The seedlings were harvested during the fourth week of February and fourth week of January in the first year and second year respectively. Data on dry of seedlings and yield components were recorded. Plant samples were oven dried at 70^oC until constant weight. Chemical analyses of the samples were done and nutrient uptake by the seedlings was calculated.

Source of Information: 01. Annual Research Report. 2004-05, Soil Science Division, BARI, Gazipur 02. Annual Research Report. 2005-06, Soil Science Division, BARI, Gazipur 03. Ten Years Soil Science Research Activities & Future Strategies. 2007, Soil Science Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 10,000/-  2 = 20,000/-

Total Budget (Tk.) : 10,000/-  2 = 20,000/-

Achievement/Findings:

Performance of Tomato seedlings; The biomass yield of the seedlings followed quadratic trend with the increase of AM inoculum rate. The response curve shows that the highest dry weight of tomato seedlings was produced with the AM inoculum rate of about 2.0 kg/m². Similar trend in the yield components was also observed with the increase of AM inoculum rate. Root colonization in tomato seedlings was found to increase with the increase of inoculum rate. AM Root Colonization The AM root colonization in tomato seedlings improved greatly with AM inoculation in both the years. The root colonization was found to increase (17 to 32 percent) with the increase of inoculum rate in both the years. There was also some 5 to 8% root colonization in the control treatment with indigenous natural AM population. Nutrient uptake by Tomato seedlings Uptake of all the major nutrients increased greatly with AM inoculation. In the first year no distinct increasing or decreasing trend in uptake of nutrients by tomato seedlings was observed with the increase of AM inoculum rate. While in the second year uptake P, K, Ca and S by tomato seedlings followed quadratic trend and uptake of Mg followed an increasing trend with the increase of AM inoculum rate. From the two years results it evident that dry weight and growth of tomato seedlings might be improved greatly with AM inoculation. Uptake of all the major nutrients was also improved greatly with AM inoculation. The response curve reveals that 2.0 kg AM inoculum/m²produced the highest dry weight of tomato seedlings. Better growth and AM root colonization was also observed with 1.0 to 2.0 kg AM inoculum/m². As such 1.0 to 2.0 kg AM inoculum/m²might be used in the seedbed to produce healthy and vigorous tomato seedlings.

Knowledge Management: Report/Proceedings