Sam Daniel of the Kodiyur village in the Kollankaduvetty taluka of district Kanyakumari in Tamil Nadu describes a technique to increase productivity in sweet potato crops. In low lying areas sweet potatoes are raised on soil mounds one metre high. Three sweet potato plants are raised on each mound. A mixture of 2 kg of green leaves of vijar or Siris tree (Albizia lebbeck) plant and 0.5 kg of donkey dung is put inside the mound. This results in an increase in the size of tubers. Prepare a mixture of 2 kg of green leaves of vijar or Siris tree (Albizia lebbeck) plant and 0.5 kg of donkey dung and put inside the mound of sweet potato. This method results in an increase in the size of the sweet potato tubers.
Crop: Sweet Potato
Crop Family: Convovulaceae
Crop Scientific Name: (Ipomoea batatas)
Crop Vernacular Name: Shakkariya
Ingredients: The green leaves of vijar or Siris tree (Albizia lebbeck) plant and donkey dung.
"Effect of Organic production on growth and productivity of Sweet Potato (Ipomoea batatas L.) under Poplar based Agroforestry system"
https://www.researchgate.net/publication/281585194_Effect_of_Organic_production_on_growth_and_productivity_of_Sweet_Potato_Ipomoea_batatas_L_under_Poplar_based_Agroforestry_system