Corn (Zea mays) is a nitrogen-intensive crop. If you are growing one of the new varieties of corn, one that has extra large ears, or one that is super sweet, you will probably find that it needs more nitrogen than an heirloom variety would.
But all corn needs some nitrogen at planting and at tasseling to encourage growth and to keep the leaves green and healthy. Corn is hardy in U.S. Department of Agriculture plant hardiness zones 4 though 11.
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