Guava is an evergreen, shallow rooted dicotyledonous tree with 3-10 m height with spreading branches. Guava has gained considerable eminence on an account of its high nutritive and medicinal values and also for its aroma and flavour. Foliar application of Micronutrients is essentially as important as macronutrients to have better growth, quality and yield in plants. Potassium is often referred as the quality element for crop production and it has been widely proved to have a crucial role in many crop quality parameters. Fruit size, appearance, colour, TSS, acidity, vitamins, taste as well as shelf-life are significantly influenced by supply of K. During recent days, the consumers are becoming more and more health conscious and ready to pay more for quality fruits. Today, due to increased demand for quality produce the interest of growers in production of high quality fruits is increasing. There is also need to improve post-harvest quality of guava fruits. Hence, considering the need, the present investigation "Studies on effect of combination of different forms of potassium and micronutrient on fruit yield and post-harvest quality of guava (Psidium guajava L.)". is planned.