The nutrient index (NI) value for each of the nutrients is computed for the fourteen blocks of Tiruchirappalli district from the percentage of samples that falls under the category of high, medium and low. The NI value ( ) for available S, in the most of blocks of Tiruchirappalli district was recorded the high nutrient index value. The nutrient index value () for DTPA-Cu was very low in Thirupparankundram, Melur, Chellampatty and Alanganallur, in case of Manikandam block was falls in high category. The NI value () of available Zn was found very low in the most of blocks, marungapuri block showed high NI value. | Nutrient index values and soil fertility ratings for available sulphur and micronutrients of Tiruchirappalli district of Tamil Nadu, India
