Grazing and no-till cropping impacts on nitrogen retention in dryland agroecosystems

Megan L. Mobley, Rebecca L. McCulley, Ingrid C. Burke, Gary Peterson, David S. Schimel, C. Vernon Cole, Edward T. Elliott, Dwayne G. Westfall

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


As the world's population increases, marginal lands such as drylands are likely to become more important for food production. One proven strategy for improving crop production in drylands involves shifting from conventional tillage to no-till to increase water use efficiency, especially when this shift is coupled with more intensive crop rotations. Practices such as notill that reduce soil disturbance and increase crop residues may promote C and N storage in soil organic matter, thus promoting N retention and reducing N losses. By sampling soils 15 yr after a 15N tracer addition, this study compared long-term soil N retention across several agricultural management strategies in current and converted shortgrass steppe ecosystems: grazed and ungrazed native grassland, occasionally mowed planted perennial grassland, and three cropping intensities of no-till dryland cropping. We also examined effects of the environmental variables site location and topography on N retention. Overall, the long-term soil N retention of > 18% in these managed semiarid ecosystems was high compared with published values for other cropped or grassland ecosystems. Cropping practices strongly influenced long-term N retention, with planted perennial grass systems retaining > 90% of 15N in soil compared with 30% for croplands. Grazing management, topography, and site location had smaller effects on long-term N retention. Estimated 15-yr N losses were low for intact and cropped systems. This work suggests that semiarid perennial grass ecosystems are highly N retentive and that increased intensity of semiarid land management can increase the amount of protein harvested without increasing N losses.

Original languageEnglish
Pages (from-to)1963-1971
Number of pages9
JournalJournal of Environmental Quality
Issue number6
StatePublished - 2014

Bibliographical note

Publisher Copyright:
© American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law


Dive into the research topics of 'Grazing and no-till cropping impacts on nitrogen retention in dryland agroecosystems'. Together they form a unique fingerprint.

Cite this