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United States Department of Agriculture

Agricultural Research Service

Research Project: LANDSCAPE-BASED CROP MANAGEMENT FOR FOOD, FEED, AND BIOENERGY

Location: Cropping Systems and Water Quality Research

Title: A Meta-Analysis quantifying the relationships between response to nitrogen fertilization vs soil texture and weather)

Author
item Tremblay, Nicolas
item Bouroubi, Yacine
item Belec, Carl
item Mullen, Robert
item Kitchen, Newell
item Thomason, Wade
item Ebelhar, Steve
item Mengel, David
item Raun, William
item Francis, Dennis
item Vories, Earl - Earl
item Ortiz-monasterio, Ivan

Submitted to: Nitrogen Workshop Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2013
Publication Date: 4/15/2013
Citation: Tremblay, N., Bouroubi, Y.M., Belec, C., Mullen, R.W., Kitchen, N.R., Thomason, W.E., Ebelhar, S.A., Mengel, D.B., Raun, W.R., Francis, D.D., Vories, E.D., Ortiz-Monasterio, I. 2013. A Meta-Analysis quantifying the relationships between response to nitrogen fertilization vs soil texture and weather [abstract]. Nitrogen, Environment, and Vegetables Workshop, April 15-17, 2013, Turnin, Italy. P. 45-46.

Interpretive Summary:

Technical Abstract: Weather and soil properties are known to affect soil nitrogen (N) availability and plant N uptake. Studies examining N response as affected by soil and weather sometimes give conflicting results. Meta-analysis is a statistical method for estimating treatment effects in a series of experiments to explain the sources of heterogeneity. In this research, the technique was used to examine the influence of soil and weather parameters on N responses of corn (Zea mays L.) across 51 studies involving the same N rate treatments which were carried out in a diversity of North American locations between 2006 and 2009. Results showed that corn response to added N was significantly greater in fine-textured soils than in medium-textured soils. Abundant and well-distributed rainfall and, to a lesser extent, accumulated corn heat units enhanced N response. Corn yields increased by a factor of 1.6 (over the unfertilized control)in medium-textured soils and 2.7 in fine- textured soils at high N rates. Subgroup analyses were performed on the fine- textured soil class based on weather parameters. Rainfall patterns had an important effect on N response in this soil texture class, with yields being increased 4.5-fold by in-season N fertilization under conditions of “abundant and well-distributed rainfall.” These findings could be useful for developing N fertilization algorithms that would allow for N application at optimal rates taking into account rainfall pattern and soil texture, which would lead to improved crop profitability and reduced environmental impacts. The study shows how N savings could be substantial in vegetable crops if the interaction between soil texture and rainfall management is taken into account in the N rate decision-making process.

Last Modified: 8/24/2016
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