NEW DELHI (Reuters) - Automaker Mahindra and Mahindra Ltd posted a 4 percent drop in second-quarter net profit, missing analyst estimates, after a poor and delayed monsoon hit demand for its tractors. Net profit for the quarter ended Sept. 30 was 9.47 billion rupees ($154 million) compared with 9.9 billion rupees a year earlier, the country's largest utility vehicle maker said on Friday. Net sales rose about 7 percent to 94.18 billion rupees. Analysts on average were expecting a net profit of 9.55 billion rupees, according to Thomson Reuters I/B/E/S. ($1 = 61.4100 rupees) (Reporting by Aditi Shah; Editing by Subhranshu Sahu)