Ed Lentz, Extension District Specialist, Agronomy
Gary Wilson, Extension Agent, Agriculture and Natural Resources
To evaluate the effects that N-serv at sidedress may have on corn yields.
| Cooperator: | Tim Jackson | Fertilizer: | Fall applied and incorpo- |
| County: | Hancock | rated; lime = 3 tons/A; | |
| Nearest Town: | Findlay | P = variable rate to 30 ppm | |
| Drainage: | Systematically tiled | Planting Date: | May 20, 2002 |
| Soil type: | Blount silt loam | Planting Rate: | 30,000 seeds/A |
| Tillage: | Fall chiseled and leveled | Row Width: | 30-inch |
| Previous Crop: | Soybeans | Herbicides: | 2.1 qt/A Bicep; 1 lb/A |
| Variety: | NK 58D1 | Princep | |
| Soil test: | pH = 6.0, P = 28 ppm, | Harvest Date: | October 15, 2002 |
| K = 116 ppm |
Experimental design was a randomized complete block with two treatments replicated four times. Treatments were 150 lb nitrogen/A from anhydrous ammonia with or without N-serv applied at sidedress. The rate of one qt/A of N-Serv was applied. Plots were 30 feet wide and 1,090 feet long. Grain weight was estimated by a weigh wagon. Grain samples were taken to a nearby elevator to estimate moisture with a commercial tester. Yield was adjusted to 15% moisture. Harvest population was estimated by counting plants from 17.4-foot sections of two center rows per plot.
The average corn grain yield and other agronomic traits response to N-Serv addition are given in Table 1 (means followed by the same letter in a column are not statistically different).
Table 1. Average Corn Grain Yield and Other Agronomic Traits in Response to N-Serv Addition.
| N-Serv | Harvest | Harvest | Harvest |
| Added | Yield | Moisture | Population |
| (bu/A) | (%) | (plants/A) | |
| Yes | 112.8 | 19.6 a | 27,375 |
| No | 110.2 | 19.3 b | 27,125 |
| LSD (0.05) | NS | 0.2 | NS |
| F-test | <1 | 35.5 | <1 |
The only statistical difference for the study was for harvest moisture, and these values were close for practical purposes. Yield differences may not have been detected because of the abnormally hot and very dry summer. Normally, yields would be expected between 175 to 200 bu/A. Root development may have been restricted from cool and wet early conditions followed by hot, dry conditions, which would have reduced nitrogen uptake.
Because of the abnormally dry weather, no conclusion from this study should be made about N-Serv added to sidedress anhydrous ammonia. The inability of the crop to uptake nitrogen, as well as other problems associated with drought, limited the amount of information obtained from this study. Further research would be required in a more normal year to see if N-Serv application affects grain yield and/or moisture.
The authors of this report are grateful for the support provided by Blanchard Valley Farmers Co-op.
For more information, contact:
Ed Lentz
Ohio State University Extension,
Northwest District
1219 W. Main Cross St., Suite 202
Findlay, OH 45840
419-422-6106
lentz.38@osu.edu
Gary Wilson
Ohio State University Extension,
Hancock County
7868 CR 140, Suite B
Findlay, OH 45840
491-422-3851
wilson.26@osu.edu