Grain Corn Nitrogen Uptake and Partitioning
Crops:
Almonds
Barley
Broccoli
Cauliflower
Citrus
Corn for Grain
Corn for Silage
Cotton
Grapevines
Lettuce
Pistachio
Rice
Strawberries
Tomatoes
Walnut
Wheat
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
(Karlen et al., 1987).
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%. (Karlen
et al., 1987).
Nitrogen Partitioning
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 (Kramer et al., 2002).
Nitrogen Removed at Harvest
Yield and N removed with grains. Values from a study carried
out at Davis, CA. Corn was fertilized with 200 lbs N/acre
(Kramer et al., 2003). In a review of several studies from the
Eastern U.S., Heckman and coworkers (2003) reported an average
N content of 24 lbs/ton of grain with values ranging from 19
to 31 lbs N/ton of grain. An average grain N content of 24
lbs/ton was also reported in a review by Ciampitti and Vyn
(2012).
Links
References
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.
Heckman, J.R., Sims, J.T., Beegle, D.B., Coale, F.J., Herbert, S.J., Bruulsema, T.W., Bamka, W.J., 2003. Nutrient removal by corn grain harvest. Agronomy Journal 95, 587–591.
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.