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Effect of Soil Moisture and Soil Temperature on the Development of Stemphylium Blight of Lentil

M. I. Huqa
Regional Agricultural Research Station, Rahmatpur, Barisal

A. Z. M. N. A. Khan
Department of Botany, Dhaka University, Dhaka-1000, Bangladesh.

Abstract/ Executive Summary:

The soil moisture and the soil temperature at 7 a. m. and 1 p. m. were monitored in the lentil field. During the years of studies it was observed that the highest PDI was recorded on March 12 with corresponding soil temperature at 7 a.m. and 1 p.m. and soil moisture were maximum while the lowest PDI was recorded on January 30 when the aforesaid soil factors were minimum. The soil temperature and soil moisture were found positively correlated with disease development.

Keywords: Stemphylium blight, Soil moisture, Soil temperature, Lentil

Location: RARS,Rahmatpur,Barisal

Start Date:

End Date:

Program Area: Pest Management

Commodity: Lentil

Objectives:

To study the effect of soil moisture and temperature on the initiation and development of disease in lentil.

Methodology:

The experiment was conducted at Regional Agricultural Research Station, Rahmatpur, and Barisal. The experiment was laid out in a well managed piece of land using RCB design having three replications. The unit plot size was 4m x 3m with 25cm row to row spacing. The seeds were sown in the rows in continuous manner. A susceptible genotype L - 81124 was sown on different dates, viz., November 01, 10, 20, 30, December 10, 20 and 30. After completion of the sowing, the experiment was kept under constant watch from sowing up to harvest. The data on soil factors such as soil temperature and soil moisture with corresponding sowing dates were recorded. The disease data were recorded from 25 randomly tagged plants/plot on the basis of 1-9 scoring scale and Percent Disease Index (PDI) was computed on the basis of the recorded data according to the formula (Wheeler, 1969). 1 = No leaf infected, 2 = Few scattered leaflets infected but no twigs blighted, 3 = Few scattered leaflets infected and 5% twigs blighted, 4 = 5-20% leaflets infected and up to 10% twigs blighted, 5 = 20-40% leaflets infected and up to 20% twigs blighted, 6 = 40-70% leaflets infected and up to 30% twigs blighted, 7 = 40-70% leaflets infected and up to 50% twigs blighted, 8 = 70-90% leaflets infected and up to 70% twigs blighted, 9 = > 90% leaflets infected and >70% twigs blighted. To study the effect of soil moisture and soil temperature on development of disease, soil moisture and soil temperature were monitored every day in the experimental field started from the date of 1st sowing and continued up to the date of harvest (March 20) of last sowing. Soil temperature It was recorded with the help of a thermometer by placing to a depth of 1cm from the soil surface. Reading was taken twice daily at 7a.m. and 1p.m.Soil moisture Soil samples were collected from 5 randomly selected spots of the experimental plot with the help of augur at every alternate day. The collected soil from different spots were mixed thoroughly and taken in aluminum pots and dried in the ovenfor 24 hr at 65^oC.

Source of Information: Bangladesh J. Sci. Ind. Res. 46(1), 83-88, 2011

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the findings of three consecutive years it could be indicated that the highest severity of Stemphylium blight of lentil was recorded when the soil factors were maximum during the month of March. The disease development was found positively correlated with the increase in soil temperature and soil moisture. However, it could be recommended that lentil should be grown in the early winter to escape the Stemphylium blight as soil temperature and moisture are found minimum in that period.

Knowledge Management: Journal