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Nitrogen. Com uses nitrogen from the moment roots begin to function, until ears dent in late summer. Corn's need for nitrogen is sizeable. Most soils have enough nitrogen to produce about 70 bushels of com per acre. For yields over 70 bushels, you must rely on nitrogen from fertilizer. For example: Yield goal Extra nitrogen required 70 to 120 bu. 121 to 200 bu. 2.5 lbs. N for each bu. over 70 3.0 lbs. N for each bu. over 70 Subtract cany-over nitrogen, nitrogen in manure or nitrogen from legumes preceding crop. Nitrogen stretches water. Nitrogen helps to produce more bushels of com per inch of rainfall. In university tests com with no nitrogen yielded 4.9 bushels of com per inch of water. Com receiving 150 pounds of N per acre produced 7.4 bushels per inch of wetter... or, 5156 more. Yield Bushels Per Inch of Water No Nitrogen 150# N/A 91 Bu. 147 Bu. 4.9 7.4
Phosphorus. The following figures, at three yield levels, show that a sizeable amount of phosphorus is removed from the soil by each com crop: Com Yield Bu/A PhosphorusPzOs Removed in Grain and Stover TOO 150 200 60 pounds 90 pounds 120 pounds Replacement not enough. Just a portion of phosphorus
can be taken up by the first crop following application ... only 2056 to 3356 in most soils. So, where your soil is low in phosphorus you should apply higher rates than the removal shown above. Appication of three times the actual removal may be necessary to reach your desired yield goal.
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