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Post-Harvest Soil Nitrate in Irrigated Corn

Variability Among Eight Field Sites and Multiple Nitrogen Rates

^a Dep. of Crop and Soil Sciences, Michigan State Univ., Plant and Soil Sciences Bldg., East Lansing, MI 48824
^b USDA-ARS, Building 3702, Curtin Rd., University Park, PA 16802
^c Dep. of Plant and Soil Sciences, Oklahoma State Univ., 368 Agricultural Hall, Stillwater, OK 74078
^d Dep. of Agronomy, Kansas State Univ., 2004 Throckmorton Plant Sciences Center, Manhattan, KS 66506

View larger version (25K): [in a new window]   Fig. 1. Preplant and post-harvest soil NO3–N concentration (0- to 240-cm depth) at Ellinwood for six N treatments (kg N ha–1) and two irrigation treatments (1.0x and 1.25x). Significant differences in NO3–N among N treatments for a given depth are indicated with a *N, in NO3–N among sampling depth with a *Depth, and N treatment by depth interactions with a *Depth x N, as determined by repeated measures analysis at = 0.10.

View larger version (25K): [in a new window]   Fig. 2. Preplant and post-harvest soil NO3–N concentration (0- to 240-cm depth) at Rossville and Manhattan for six N treatments (kg N ha–1). Significant differences in NO3–N among N treatments for a given depth are indicated with a *N, in NO3–N among sampling depth with a *Depth, and N treatment by depth interactions with a *Depth x N, as determined by repeated measures analysis at = 0.10.

View larger version (22K): [in a new window]   Fig. 3. Preplant and post-harvest soil NO3–N concentration (0- to 240-cm depth) at Pretty Prairie for six N treatments (kg N ha–1). Significant differences in NO3–N among N treatments for a given depth are indicated with a *N, in NO3–N among sampling depth with a *Depth, and N treatment by depth interactions with a *Depth x N, as determined by repeated measures analysis at = 0.10.

View larger version (29K): [in a new window]   Fig. 4. Preplant and post-harvest soil NO3–N concentration (0- to 240-cm depth) at Scandia and St. John for six N treatments (kg N ha–1). Significant differences in NO3–N among N treatments for a given depth are indicated with a *N, in NO3–N among sampling depth with a *Depth, and N treatment by depth interactions with a *Depth x N, as determined by repeated measures analysis at = 0.10.