Critical limits of deficiency and toxicity of zinc in paddy in a typic Ustipsamment

Abstract

Abstract A pot culture experiment was conducted to establish the critical limits of deficiency and toxicity of Zn in a Typic Ustipsamment from tropical India. Critical limits of Zn deficiency and toxicity were 0.39, and 12 μg/g with DTPA‐TEA‐CaCl2, 2.2 and 26 μg/g with EDTA‐(NH4)2Co3 and 0.78 and 12 μg/g with HC1 (0.05 N), respectively. Critical concentrations in the rice plants associated with deficiency and toxicity were 16 and 190 μg/g. Key words: Critical limitsZinc deficiencyZinc toxicity