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Corn Grain Nitrogen Uptake and Partitioning
Seasonal N Uptake
Nitrogen uptake curve of corn grown in New Jersey. Corn was fertilized with 230 lbs N/acre; grain yield averaged 10,700 lbs/acre (5.36 tons/acre). Uptake was determined by harvesting the aboveground biomass 6 to 8 times during corn development . Corn plants took up little N until they reached the 6-leaf stage (V6). Most N was taken up between the 6-leaf stage and silking (R1). The proportion of N taken up between silking and maturity (R6) ranged from less than 10% to about 40%. .
In a study carried out at Davis, CA, about 52% of the total aboveground N was in the grains at maturity. The grain yield reached 10,650 lbs/acre (5.3 tons/acre). Slightly less than half of the N was in the stover .
Nitrogen Removed at Harvest
|Location||Years||Removal (lbs N/ton @ 15.5% moisture)||Source|
|Global||1991-2011||24.0||6.0 - 53.6|||
|Weighted Average||24.0||6.0 - 53.6|
- Ciampitti, I.A., Vyn, T.J., 2012. Physiological perspectives of changes over time in maize yield dependency on nitrogen uptake and associated nitrogen efficiencies: A review. Field Crops Research 133, 48-67.
- Geisseler, D., 2016. Nitrogen concentrations in harvested plant parts -A literature overview. Report to the Kings River Watershed Coalition.
- Karlen, D.L., Sadler, E.J., Camp, C.R., 1987. Dry matter, nitrogen, phosphorus, and potassium accumulation rates by corn on Norfolk Loamy Sand. Agronomy Journal 79, 649-656.
- Kramer, A.W., Doane, T.A., Horwath, W.R., van Kessel, C., 2002. Combining fertilizer and organic inputs to synchronize N supply in alternative cropping systems in California. Agriculture, Ecosystems and Environment 91, 233-243.