Department of Soil Science and Agricultural Chemistry, College of Horticulture, Kerala Agricultural University, Thrissur, Kerala, 680656
*Corresponding author, (E-mail: dvknrao@rubberboard.org.in)
Present address: 1Agoronomy/Soils Division, Rubber Research Institute of India, Kottayam, Kerala, 686009
Six physiographic units predominantly under rubber in Kerala were studied to ascertain the role of variations inherent in the physiographic units on fertility capability classification (FCC). To ascertain the role of slope on the FCC soils were collected from three reaches of slope i.e. top, middle and bottom and characterized. An attempt was made to introduce a local modifier ‘m’, using the critical value of 1.0 mg 100 g−1 soil as the threshold. Differences in FCCs were noticed among the physiographic units. Reaches of the slope also exhibited variations in FCCs. Introduction of condition modifier ‘m’ identified three FCCs with Mg deficiency. Fourteen FCCs were identified under five soil taxa.
Fertility capability classification, rubber, taxa
