Tennessee ranks about number 16 in corn production in the United States. In most years, more than 750,000 acres are grown annually for grain and silage. Most corn is grown in a rotation system, but acreage fluctuates somewhat with commodity and fertilizer prices and weather at planting. The majority of acres are non-irrigated and producers rely on field selection, early planting and heat tolerance of hybrids to produce good yields. Yields are heavily dependent on available moisture and hot, dry conditions in the summer can affect pollination and subsequently production for the year. Corn is grown across the state of Tennessee with heaviest production in western and middle Tennessee counties (production map). Most silage is grown near livestock production areas in middle and east Tennessee. Less than 10% of acres are irrigated and about 85% of corn is grown in a no-till or conservation tillage system.