Concept:
• Akbar's land revenue system (the Zabti system) classified land based on its productivity and the frequency of cultivation.
• This classification ensured a systematic approach to tax collection across the empire.
Step 1: Defining the land categories
Polaj was the most fertile land, cultivated every year.
Parauti was land left uncultivated for a year or two to recover its fertility.
Chachar was land left fallow for three to four years.
Banjar was the least productive, uncultivated for five or more years.
Step 2: Matching the description
The question specifically asks for land kept fallow for three to four years, which corresponds to the category 'Chachar'.