Mapping of macronutrients status by geographic information system (GIS) under Ceiba pentandra plantation

A study was conducted to assess available macronutrient status of soils of Theni district in Tamil Nadu under Ceiba pentandra plantation by geographic information system (GIS) technique. Soil samples were drawn from 106 surface (0–15 cm) and sub-surface (15–30 cm) kapok plantation and analysed for their fertility status and mapped by geographic information system (GIS) technique. The pH of surface soil was acidic to neutral and sub-surface was neutral to alkaline. Soil organic matter content was medium to high in surface and low to medium in sub-surface soil. Available nitrogen was very low to marginal in surface and very low in sub-surface soil; the status of phosphorus was high in both surface and sub-surface soil and available potassium was very high in surface and marginal in sub-surface soil.