What question did this study set out to answer?

Determine how the rate and timing of nitrogen fertilizer application affect continuous corn grain yield, tissue nitrogen concentration, and overall nitrogen uptake.

January 1, 1992jpa

Nitrogen Fertilizer Management Effects on Corn Grain Yield and Nitrogen Uptake

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Determine how the rate and timing of nitrogen fertilizer application affect continuous corn grain yield, tissue nitrogen concentration, and overall nitrogen uptake.
Conducted a field experiment during 1986 and 1987 across two sites in Iowa using continuous corn (Zea mays L.).
Tested 21 treatment combinations of preplant and V6 sidedress applications of (NH4)2SO4 incorporated to a 4-inch depth across six rates ranging from 0 to 175 lb N/acre.
Fitted two regression equation models to evaluate the relative effects of preplant versus sidedress application on yield, leaf-N, grain-N, and total N uptake.
Nitrogen application rate significantly increased grain yield, leaf-N content, grain-N content, and N uptake at both sites in both years.
Grain yields ranged from 70 to 187 bu/acre at Site 1 and 76 to 223 bu/acre at Site 2 in 1986, compared to 77 to 146 bu/acre at Site 1 and 51 to 175 bu/acre at Site 2 in 1987.
Timing of nitrogen application had no significant effect except at Site 1 in 1986, where sidedress application significantly increased grain yield, grain N uptake, and leaf N content relative to preplant application in correlation with growing season rainfall.

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Implication

Field trial demonstrates that nitrogen rate increases yield and uptake in continuous corn, suggesting timing benefits depend on growing season rainfall rather than efficiency gains.

Cite This Study

Killorn et al. (1992) studied this question.

synapsesocial.com/papers/6a9657ee18d06551b501fba9 https://doi.org/10.2134/jpa1992.0142

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Implication

Field trial demonstrates that nitrogen rate increases yield and uptake in continuous corn, suggesting timing benefits depend on growing season rainfall rather than efficiency gains.

Nitrogen Fertilizer Management Effects on Corn Grain Yield and Nitrogen Uptake

Key Points

Discussion

Implication

Cite This Study

Nitrogen Fertilizer Management Effects on Corn Grain Yield and Nitrogen Uptake

Key Points

Discussion

Implication

Cite This Study

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