National Fertilizers today reported a 45.56% decrease in net profit at Rs 25.61 crore for the second quarter ended September 30, 2006 when compared with Rs 47.05 crore in Q2FY06.According to a release issued by the company to the BSE today, total income decreased 0.3% to Rs 1082.1 crore from Rs 1085.07 crore in Q2FY06.