Test PB Collection: FTE

Sampling For the variability assessment trials, leaf samples are taken five times during the season from within the canopy of each of 1054 replicate trees from 4 locations (Arbuckle, Salida, Madera, Belridge).

Layout of sampling replicates in experimental almond orchard in Kern Co. A four-year fertigation trial of nitrogen and potassium treatments is underway in almond at a Kern Co. site. The trial was replicated under two irrigation systems, FanJet microsprinklers and Drip.

Gary L. Obenauf Director of Research California Dried Plum Board 3840 Rosin Court, Suite 170 Sacramento, CA 95834 gobenauf@agresearch.nu Nancy Ireland Research Chair National Grape and Wine Initiative 502 E.

United States Department of Agriculture Specialty Crop Research Initiative Almond Board of California The Mosaic Company Tessenderlo Kerley YARA North America, Inc.

Leonardo Lombardini & Astrid Volder Fig. 1. Preparing new study orchard.This component of the project involves developing an understanding of the timing of root activity, and characterizing nitrogen and water movement through the soil profile.

David Slaughter, Yun (Carolyn) Zhang The standards for leaf tissue analysis and nitrogen management in fruit and nut trees were established in the 1950's and 1960's and have been only modestly refined over the subsequent years.

Fig. 2. Reflecteance versus wavelenth Leaf reflectance was measured in the field for pairwise comparison to stem water potential, and chlorophyll content (Fig. 2). The spectrometer optical cable was held level for pairwise reflectance above and below canopy for these transmittance measurements.

Patrick Brown Group Sebastian Saa Silva, Graduate student Saiful Muhammad, Graduate student Ismail Siddiqui, Graduate student Eike Luedeling Jan Hopmans Group Maziar Kandelous, Graduate Student Andres Olivos, Graduate Student Blaine Hanson, UCCE Specialist, Dept.

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