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 Achievements

  • Weekly, monthly, annual and seasonal behavior of rainfall for the Kovilpatti region was studied using historic rainfall data for the period 1905-1991. Weekly rainfal probabilities were cmputed and a crop weather calender incorporating details of crop species suitable for the different seasons was developed.
     
  • Studies on seasonal rainfall showed the existence of a close ralationship between the quantum of rainfall received during September and the seasonal rainfall during theNorth-east monsoon season. It was expressed as a reciprocal hyperbola.
     
  • Decadal analysis of rainfall data since 1911 revealed that the ratio of years of occurrence of above-normal to deficit in rainfall changed from 7:3 in the decades upto 1970, to a value of 5:5 since 1971 showing an increase in the deficit rainfall Years.
     
  • Seed cotton yield found to be higher in the crop sown in the pre-monsoon season with a gradual decline in yield in case of monsoon and late monsoon sowing. When intercropped with black gram or clusterbean, cotton yields decreased by 10 and 14 per cent, respectively. However, intercropping was found to reduce the incidence of leaf hopper and bollworm.
     
  • Under Crop-weather modelling experiments in cotton, database was generated on phenophases, leaf area index, plant height and above-ground biomss in cotton for pre-monsoon, monsoon and late monsoon sowings during the year 1997.
     
  • Considerable work was done to delineate cotton growing environment regions. Broad regions at National level and detailed analysis for the Tamil Nadu region was carried out and brought out as a monograph "COTTON GROWING ENVIRONMENTS".
     
  • Correlation of light trap catches of yellow stem borer, leaf folder and green leaf hopper for the period 1977-78 to 1986-87 with weather parameters for the corresponding seasons showed positive correlation with relative humidity, rainfall and a negative correlation with maximum temperature.