Address: Krishi Vigyan Kendra, Vagaikulam, Mudivaithanendal, Thoothukudi, Tamilnadu

A well equipped lab is available to diagnose the soil fertility status of the district and to emphasize the importance of soil analysis to farmers.
 A fertility map is prepared where the available nitrogen, phosphorous and potassium is marked as low, medium or high. Areas of sufficient and insufficient nutrients are marked out and nutritional requirements are determined. Fertilizers such as NPK, lime or gypsum are recommended to improve soil fertility. Fertilizer addition, which is based on soil testing, usually leads to an increase in yields and profits by providing the correct amounts of needed nutrients.