The sum of (a) and (b) is TAAI. Typically, some areas have only one crop a year, others two, and some areas have continuous yearround (e.g., sugarcane) crops. However, the overall TAAI remains constant across the seasons. What changes from season to season within the TAAI will be the ratio of area irrigated to area left fallow. Typically, in the main cropping season (kharif, or June to October) in India, the actual area irrigated is the maximum with the area
left fallow being the minimum. This trend changes in the rabi season (November to February) when fallow areas increase and cropped areas decrease. However, irrespective of the season TAAI remains constant with variation in the proportion of irrigated areas to fallow areas. The nearest equivalent of TAAI in the Food and Agricultural Organization of the United Nations and the University of Frankfurt (FAO/UF; Siebert et al., 2006) are ``areas equipped for irrigation'' (but not necessarily irrigated) (Siebert et al., 2006). The equivalent of TAAI in the national statistics is Net Irrigated Areas.