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Optimal Plant Population and Nitrogen Fertility for Dryland Corn in Western Nebraska

^a Panhandle Res. and Ext. Cent., 4502 Ave. I, Scottsbluff, NE 69361
^b Dep. of Biometry, 103 Miller Hall, Univ. of Nebraska, Lincoln, NE 68583-0712

View larger version (42K): [in a new window]   Fig. 1. Monthly (May through August) precipitation at the Banner, Box Butte, Cheyenne, and Kimball County sites in 1999 and 2000. Area within the bars represent + or - one standard deviation from the 30-yr (1961–1990) average monthly precipitation.

View larger version (21K): [in a new window]   Fig. 2. Linear relationships between corn yields and plant populations at the Banner County site in 1999 and Box Butte, Cheyenne, and Kimball County sites in 1999 and 2000. At each environment, yield data were averaged over fertilizer N treatments as there was no interaction between the population and the fertilizer effect (P > 0.05).

View larger version (16K): [in a new window]   Fig. 3. Relationship between available N before crop emergence (soil test N measured to a depth of 120 cm and N from fertilizer) and dryland corn yield in western Nebraska in 1999 and 2000.