Applying almond hulls and shells as potassium-rich amendments

Project Type: Research and Education
Funds awarded in 2020: $349,807.00
Projected End Date: 12/31/2023
Host Institution Award ID: G126-21-W7899
Grant Recipient: University of California Davis
Region: Western
State: California
Principal Investigator:
Dr. Sat Darshan Khalsa
University of California Davis
Dr. Patrick Brown
University of California Davis
Dr. Amelie Gaudin
University of California, Davis
New studies show that almond hulls and shells release potassium into the soil when they are surface applied as organic matter amendments in the orchard. Potassium release from hulls and shells is strongly driven by water application and is not initially limited by decomposition rate. This practice can help increase soil exchangeable potassium with benefits to July leaf potassium values. In the long term, hull and shell amendments could be used with other soil health practices such as reduced soil disturbance to build soil organic matter content while reducing dust and erosion. Hulls and shells are often locally available and can be returned to the orchard at low costs.
Ellie Andrews, UC Davis
Sire Kassama, UC Davis
Target audiences:
Farmers/Ranchers; Educators
Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture or SARE.