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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: Extra nitrogen Yield goal required 70 to 120 bu. 121 to 200 bu. 2.5 lbs. M for each bu. over 70 3.0 lbs. N for each bu. over 70 Subtract carry-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 rainfal. 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 water ... or 51% 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 Too" 150 200 PhosphomsP^s Removed in Grain and Stover 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 20% to 33% in most soils. So, where your soil is low' in phosphorus you should apply higher rates than the removal shown above. Application of three times the actual removal may be necessary to reach your desired yield goal.
88.4%