Sioux City-Terra Nitrogen Co. LP reported net income of $17.4 million ($.92 per lp unit) on sales of $119.1 million for the second quarter ending June 30, 2006, compared to the year-ago $29.4 million ($1.56 per unit) and $120.1 million, respectively. Six-month net income was $14.9 million ($.79 per unit) on sales of $214.6 million, versus the year-ago $46.6 million ($2.47 per unit) and $226.1 million, respectively.