Nitrogen calculator: A decision support tool for compost production of white button mushroom

White button mushroom is most favoured mushroom both in India and world. It is revered for one of the option to meet the growing vegetable demands of India as mushroom cultivation do not require additional land. The productivity of white button mushroom mainly depends on the quality of compost. Button mushroom compost is prepared from wide variety of substances and accordingly the nutrient content and quality varies widely. Mushroom growers facing difficulty in choosing ingredients for producing quality compost besides lacking understanding on proportion of different ingredients for making compost. This paper illustrates about the decision support tool for making ideal compost for button mushroom compost.