CRITICAL LEVELS OF MICRO AND SECONDARY NUTRIENTS IN SOILS AND CROPS FOR OPTIMUM PLANT NUTRITION

Dr. T. Prabhakar Reddy; D. Vijaya Lakshmi; J. Kamalakar; Ch. Sambasiva Rao

Volume : VI, Issue : V, May - 2017

CRITICAL LEVELS OF MICRO AND SECONDARY NUTRIENTS IN SOILS AND CROPS FOR OPTIMUM PLANT NUTRITION

Dr. T. Prabhakar Reddy, D. Vijaya Lakshmi, J. Kamalakar, Ch. Sambasiva Rao

Abstract :

Critical limits of deficiency of micronutrients in soils and plants are usually employed to advice on need of micronutrient fertilization. The aim of good nutrition plan is to keep all nutrients at the optimum level. Below the optimum concentration, conditions start developing into deficiency and above the optimum towards wasteful and then toxic levels. The soil critical levels established for Zn, Cu, Fe, Mn, B, Mo and S were 0.6, 0.2, 4.0, 2.0, 0.5, 0.2 and 10.0 mg kg–1, respectively. Diagnosis and prevention of nutrient deficiency and toxicity requires a further knowledge of symptomology with critical values of any particular element in plants too.