An experiment was conducted during 2016-2017 to study the critical limit of Zinc in soil and plant. Pea (Pisumsativum L.) cv. Rachna was taken as the test crop. The treatments consisted 0, 2.5 and 5.0 kg Zn ha-1 as ZnSO4.7H2O and Recommended dose of Nitrogen, Phosphorus and Potas has urea, single super phosphate and muriate of potash, were used. Each treatment was replicated thrice. Application of 5.0 kg Zn ha-1 gave the highest yield of pea. Dry matter yield, zinc content and zinc uptake by the plant also increases as the level of zinc increases. According to the graphical procedure of Cate and Nelson (1965) using a scatter diagram, the critical limit of available zinc was 0.69 mg kg-1 whereas the critical concentration of zinc in 50 days old pea plant tissue was 0.21 per cent.
