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Fluid Journal : Fluid Journal 1996-1998
4 Fluid Journal Summer 1998 organic matter, soil organic N, lime content, pH, N mineralization rate, and profile NO3-N on yield, about 58 percent of total yield among variance positions was explained. Soil index values and corn yields were positively affected by soil organic matter, soil organic N, profile NO3-N, and N mineralization rates, and negatively affected by lime content and pH (Figure 4). These results show that using only one soil test parameter to predict yield response to applied fertilizer has limited effectiveness. A multi variate approach to fertilizer application is required since yields and yield response to fertilizer are dependent not only on nutrient level in the soil but also on several other factors. Proe e Pocdur Procedure Procedure Procedure Selected landscapes were near Sterling and Stratton in eastern Colorado, varying 220 to 1,300 feet in length. Corn was planted no-till in a wheat-corn-fallow cropping system. Composite soil samples to a 4-foot depth in 12-inch increments were taken along each transect. Hybrids were NK 4242 and Pioneer brand 3752. N was banded at 30, 60, 90 and 120 lbs/A at Sterling and Stratton 2 sites. At Stratton 1, rates were 0 and 120 lbs/A. N was dribbled as UAN over the row at planting. P2O5 was applied at 15 lbs/A to all treatments. Dr. Ortega is a research scientist, INIA, Chile and former graduate of CSU; Drs. Westfall and Peterson are professors, and Gangloff is research associate, Colorado State University. 1Moran's I is a dimensionless statistic that ranges from --1 to +1. It determines spatial relationship of measured parameters. A large Moran's I (+/-1) indicates a strong relationship between measured parameters, while zero indicates complete independence among parameters. 2Range for spatial dependency means properties within these distances are spatially dependent or related, while properties at greater distances are not related to each other. 3Kriging is a statistical technique used to interpolate values across an x,y coordinate system based on the value of the surrounding parameter. In this case, trends in yields over the landscape are interpolated from data at the point of interest as influenced by surrounding yield values.
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