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NITROGEN TOPDRESSING IMPORTANT ON CORN
It takes nitrogen to produce corn—and the time and method of applying it is an important factor, says G. R. Epperson, associate agronomist at VPI. \
Most or all of the phosphorus and potash needed can be applied before or at planting time. But. nitrogen should be applied as a sidedressing through the growing season.
On Eastern Virginia’s sandy soils, half the nitrogen applied as a sidedressing should go on when the corn is about knee high, the rest at the last cultivation. On sandy loam and finer textured soils, all of the nitrogen sidedressing may be applied before the corn is knee high.
Except when the corn follows a goad cop of legume which has been turned under and where 10 to 20 tons of manure has been used, the corn should receive 80 to 120 pounds of nitrogen from fertilization at planting time and as a sidedressing. Eighty pounds of nitrogen can be obtained in 500 pounds of 16%, 392 pounds of 20.5%, or 239 pounds of 33.5 per cent materials.
72.7%