Agricultural activities increased during the Late Vedic period. The Satapatha Brahmana mentions rituals related to ploughing undertaken by the kings.  

• This suggests the importance given to cultivation by the rulers, and the shift to agriculture to support the increasing population.  
• The god Balarama is depicted with a plough, which suggests the importance of cultivation. The Vedic people cultivated barley and rice, and wheat.  
• Wheat was the staple food of Punjab region. The Vedic people began to use rice in the Ganga-Yamuna doab. The use of rice, rather than wheat, is noticed in the Vedic rituals. 

Source: Tamil Nadu state board