University of California Small Grains
University of California Small Grains
University of California Small Grains
University of California
University of California Small Grains

N-rich reference zones for in-season N fertilizer management

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The N-rich reference zone is a relatively small area within a field where extra N fertilizer is added at the beginning of the season. This extra fertilizer ensures that the reference zone is not N limited between planting and the time when an in-season fertilizer decision is made. When a grower is determining whether and how much N fertilizer to add in-season, plant and soil measurements from both the reference zone and the broader field are compared to understand whether the broader field is sufficient in available N. Read more.

Case studies

Sacramento Valley

Delta

San Joaquin Valley

Intermountain Region

  • Siskiyou County (Tulelake), 2019-20
Webmaster Email: dngiang@ucdavis.edu