Plough agriculture spread in which fertile Indian alluvial river valleys in the time period around the sixth century BCE?
1) Nile and Amazon
2) Ganges and Kaveri
3) Mississippi and Danube
4) Rhine and Yangtze

Choose the correct answer from the given options:

2

During the sixth century BCE, a significant strategy to enhance agricultural production involved the adoption of plough agriculture, particularly in fertile alluvial river valleys such as those of the Ganga and the Kaveri. The iron-tipped ploughshare proved instrumental in turning the alluvial soil, especially in regions with abundant rainfall. The introduction of transplantation techniques further boosted paddy production in some parts of the Ganga valley, although it entailed strenuous labor for the cultivators.

Although the iron ploughshare led to increased agricultural productivity, its implementation was limited to specific regions of the subcontinent. Semi-arid areas like parts of Punjab and Rajasthan did not adopt it until the twentieth century, while hilly tracts in the northeastern and central parts of the subcontinent preferred hoe agriculture, which was better suited to the terrain.