What did the peasants pay the British landlords as rent? What did the British now want instead and why?

According to the long-term contract, the peasants were forced to plant fifteen percent of their holdings with indigo and pay the entire harvest as rent.  

Now, with the development of synthetic indigo in Germany, the British landlords did not want indigo from these plantations. Hence, the shrewd landlords decided to release the peasants of Champaran from the fifteen percent arrangement on the payment of a compensation.  

Development of synthetic indigo would lead to an increase in the price of natural indigo.

The peasants paid the British landlords indigo as rent. Now Germany had developed synthetic indigo. So, the British landlords wanted money as compensation for being released from the 15 per cent arrangement. The prices of natural indigo would go down due to the synthetic Indigo.

The peasants had to grow indigo on the 15% area of their land. They paid their whole indigo harvest to the British landlords as rent. The British wanted now compensation to free them from their commitment. 

किसान अपनी जमीन के 15% भाग पर नील उगाने के लिए मजबूर थे। वे किराये के रूप में अंग्रेज जागीरदारों को पूरा नील देते थे। अब अंग्रेज उन्हें उनके समझौते से मुक्त करने के बदले क्षतिपूर्ति चाहते थे।