JEQ
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published online 7 November 2005
Published in J Environ Qual 34:2243-2254 (2005)
DOI: 10.2134/jeq2005.0047
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Abstract Freely available
Right arrow Full Text Free
Right arrow Full Text (PDF) Free
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via ISI Web of Science (2)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Gehl, R. J.
Right arrow Articles by Clark, G. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Gehl, R. J.
Right arrow Articles by Clark, G. A.
Agricola
Right arrow Articles by Gehl, R. J.
Right arrow Articles by Clark, G. A.
Related Collections
Right arrow Water Management
Right arrow Nutrients
Right arrow Maize Management
Right arrow Nutrient Management
Right arrow Nitrogen

In Situ Measurements of Nitrate Leaching Implicate Poor Nitrogen and Irrigation Management on Sandy Soils

R. J. Gehla, J. P. Schmidtb,*, L. R. Stonea, A. J. Schlegela and G. A. Clarkc

a Department of Agronomy, Kansas State University, 2004 Throckmorton Plant Sciences Center, Manhattan, KS 66506
b USDA-ARS, Building 3702, Curtin Road, University Park, PA 16802
c Department of Biological and Agricultural Engineering, Kansas State University, 147 Seaton Hall, Manhattan, KS 66506



View larger version (12K):

[in a new window]
  		Fig. 1. Map of Kansas, USA, with the study site identified in Stafford County.

 


View larger version (16K):

[in a new window]
  		Fig. 2. Plot layout at the study site including IrriGage placement.

 


View larger version (46K):

[in a new window]
  		Fig. 3. Weekly summary of irrigation and rainfall data in 2001 and 2002. 1.0x IS = optimum irrigation; 1.25x IS = >25% optimum irrigation.

 


View larger version (19K):

[in a new window]
  		Fig. 4. Water flux determined at the 152-cm depth for two irrigation schedules (recommended rate and 25% over recommended rate) during the 2001 and 2002 growing seasons. On a given sampling date, {dagger} indicates a significant difference in water flux between irrigation treatments (Prob. > F = 0.10).

 


View larger version (27K):

[in a new window]
  		Fig. 5. Mean soil water NO3–N concentrations (152-cm depth) throughout the growing season for (A, B) several N (kg N ha–1) treatments and (C, D) two irrigation treatments. Means labeled with the same letter on a given date are not different as determined by LSD at {alpha} = 0.10. Significant differences in NO3–N from one sampling date to the next are indicated with a {dagger}, N treatment by time interactions with a {dagger}N, and irrigation treatment by time interactions with a {dagger}I, as determined by repeated measures analysis at {alpha} = 0.10.

 


View larger version (17K):

[in a new window]
  		Fig. 6. Seasonal leaching losses of NO3–N for four N treatments and two water treatments in 2001 and 2002. Bars labeled with the same letter for a given year are not different as determined by LSD at {alpha} = 0.10.

 




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2005 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.