Why are farm labourers like Dala and Ramkali poor?

Dala and Ramkali are poor farm labourers because, they don’t own any piece of land for farming, and just work on daily wages. Also, they get far less wages than the minimum daily wages decided by the government. The government has decided the minimum wages for a farm labourer Rs. 60 per day, but they only get Rs. 35-40. People tend to work for lower wages to earn their livelihood, which makes the competition heavy for work among farm labourers.