After receiving post-graduation degree, instead of going for employment, Mahajan chose to do farming in his Chinawal village. Banana cultivation in Jalgaon district started around 1925. Initially traditional farming methods like flood irrigation, sucker planting etc. were being used to grow banana crops. Water level in wells had dropped from 25 feet to 250 feet which had created scarcity of water for farming. Mahajan successfully used modern methods of agriculture in his farms to conserve water and increase production of banana. Mahajan uses
Grand Nain and shrimanti varieties of banana to grow in his farm. After his successful experimentation, he arranged thousands of farmer meetings all over Jalgaon district to spread awareness about high-tech methods of banana cultivation. He advocated
agronomic practices like
soil testing, planting
tissue culture plants,
drip irrigation to conserve water,
fertigation which resulted in control of weeds, lower labour cost and increase in per plant yield of banana bunch from 15 kg to nearly 30 kg. In June 2004, a team of agriculture officers from
Kerala visited Chinawal during their study tour of Jalgaon district and met Mahajan. In their report to
Government of Kerala, the team has described Mahajan's contribution to banana cultivation as "quite amazing". ==Honours==