When did agriculture begin in Africa

 5200 BC

Explanation:

The first agriculture in Africa began in the heart of the Sahara Desert, which in 5200 BC was far more moist and densely populated than today. Several native species were domesticated, most importantly pearl millet, sorghum and cowpeas, which spread through West Africa and the Sahel

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.