Proceedings :: North Central Soil Fertility Conference

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Bullock, D.G

Graham, C

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Authors

Schulz, E

Franzen, D.W

Graham, C

Sharma, L.K

Ruffo, M.L

Bollero, G.A

Bullock, D.S

Bullock, D.G

Topics

Type

Oral

Year

2015

2003

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Filter results2 paper(s) found.
1. Nitrogen and Phosphorus Recalibration for Sunflower in the Northern Great Plains Sunflower producers in the northern Great Plains states of North Dakota, South Dakota, and Minnesota are presently directed to N and P recommendations that originate from research performed in the late 1960s and early 1970s. These three states alone produce more than 80% of the sunflowers in the United States on a yearly basis (USDA-NASS, 2015). The current general formulas determining N and P fertilizer rate in these top-producing states are equivalent. The N recommendation is represented here by... Download paper
2. Field Scale Variability of Corn Yield response Functions to Fertilizer Nitrogen Application Variable rate nitrogen (N) application assumes that corn response to N fertilizer varies within a field. However, this hypothesis has not been formally tested yet. Field variation of corn response to N fertilizer and economically optimum N fertilizer rates (EON) were assessed in on- farm experiments throughout central Illinois. Fields (16 to 32 ha.) were subdivided into 13 to 20 areas. Five nitrogen rates were randomized within these areas in 28 kg N increments (2 rates) and decrements (2 rates)... Download paper

Filter results2 paper(s) found.

1. Nitrogen and Phosphorus Recalibration for Sunflower in the Northern Great Plains

Sunflower producers in the northern Great Plains states of North Dakota, South Dakota, and Minnesota are presently directed to N and P recommendations that originate from research performed in the late 1960s and early 1970s. These three states alone produce more than 80% of the sunflowers in the United States on a yearly basis (USDA-NASS, 2015). The current general formulas determining N and P fertilizer rate in these top-producing states are equivalent. The N recommendation is represented here by...

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2. Field Scale Variability of Corn Yield response Functions to Fertilizer Nitrogen Application

Variable rate nitrogen (N) application assumes that corn response to N fertilizer varies within a field. However, this hypothesis has not been formally tested yet. Field variation of corn response to N fertilizer and economically optimum N fertilizer rates (EON) were assessed in on- farm experiments throughout central Illinois. Fields (16 to 32 ha.) were subdivided into 13 to 20 areas. Five nitrogen rates were randomized within these areas in 28 kg N increments (2 rates) and decrements (2 rates)...

Download paper