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Simulation Supplements Field Studies to Determine No-Till Dryland Corn Population Recommendations for Semiarid Western Nebraska

^a Panhandle Res. and Ext. Cent, 4502 Ave. I, Scottsbluff, NE 69361
^b Agric. Prod. Syst. Res. Unit, QDPI, PO Box 102, Toowoomba, QLD, Australia 4350

View larger version (19K): [in a new window]   Fig. 1. Observed vs. predicted corn grain yields at Sidney, NE, in 1999 and 2000. A N supply of 125 kg ha-1 was used for the simulation, which was similar to the N available in the zero N rate treatment from the 1999 and 2000 field studies. Bars indicate ± 1 standard deviation from the mean.

View larger version (38K): [in a new window]   Fig. 2. Simulated corn yield for the 54 yr of historical climate record at Sidney, NE, for a crop planted at a population of 3 plants m-2 each year on 5 May with 160 mm of available soil water and 125 kg N ha-1.

View larger version (34K): [in a new window]   Fig. 3. Simulated corn yield ranges for the 54 yr of historical climate record at Sidney, NE, given different populations and different quantities of available soil water at planting. Extremes on each bar encompass the range between minimum and maximum values, extremes of the hatched section of each bar encompass the range between the 25 and 75% quartiles, and the horizontal line within each hatched section shows the median.

View larger version (13K): [in a new window]   Fig. 4. Average profit vs. risk of making a loss for a range of fixed corn populations (2–5 plants m-2) and quantities of available soil water at planting. Profit and risk data were derived from simulated corn yields for the 54 yr of historical climate record at Sidney, NE.

View larger version (25K): [in a new window]   Fig. 5. Precipitation ranges for full-season (planting through harvest) and postflower (flowering through harvest) periods using the 54 yr of historical climate record at Sidney and North Platte, NE, and the 92-yr record at Harrisburg, NE. Extremes on each bar encompass the range between minimum and maximum values, extremes of the hatched section of each bar encompass the range between the 25 and 75% quartiles, and the horizontal line within each hatched section shows the median.

View larger version (14K): [in a new window]   Fig. 6. Average profit vs. risk of making a loss for a range of fixed corn populations (2–5 plants m-2) with 160 mm of available soil water at planting. Profit and risk data were derived from simulated corn yields for the 54 yr of historical climate record at Sidney and North Platte, NE, and the 92-yr record at Harrisburg, NE.

View larger version (21K): [in a new window]   Fig. 7. Simulated gross margins obtained at a population of 3 plants m-2 minus simulated gross margins obtained at a population of 4 plants m-2 for a crop planted each year on 5 May with 160 mm available soil water and 125 kg N ha-1 and for the 54-yr record of historical climate record at Sidney, NE.