Estimation of Potassium by Mehlich-3 Extractant Under Integrated Nutrient Management

Potassium (K) is playing a vital role in sustainable crop yield potential function. Determination of available K in soil directly affects the crop yield potential. In this study, different K determination methods were used for exact estimation of K to compute interrelationship of K with crop yield under 12 modules of integrated nutrient management (INM) practices. Available K was estimated by different K determining methods. Among all, Mehlich-3 extractant determines more accurate K availability in the soil except H2SO4 extractant. Among different INM modules treatment M11 showed significantly (p < 0.05) higher availability of K (241.8 µg g−1) over control (180.1 µg g−1), whereas other INM modules comprised with M8 to M10 also showed K availability more than 200 µg g−1 by Mehlich-3 extractant. The study shows that Mehlich-3 extractant better performed under INM modules applied in soil for sustainable management of maize–chickpea cropping system.