for Fertigated California Almonds:
Improved Nitrogen Recovery
Almonds are a highly valuable and profitable crop for California farmers. Almond farmers face many challenges to produce high yielding and high quality crops that bring in premium and steady pricing. One of their major challenges is proper nutrition, especially the critical element of potassium (K). In addition, growers are faced with shortages of water and increasing salinity levels in both water and soil. Choosing the proper K fertilizer source that enhances both yield and quality, improves N recovery and minimizes salinity buildup is vital. This document summarizes UC Davis research findings on the influence of fertigation strategy and nitrogen and potassium sources on the productivity in almond.
Contrast tree performance and tree response to various K fertilizer regimes: SOP, KTS, KCl and Potassium Nitrate (KN). This study took place over a period of 4 years, 2011 - 2014.
- 8 treatments and 5 replicates total.
- 15 trees per replicate.
- Randomized Complete Block Design.
- Results presented relate to Fanjet microsprinkler irrigated applications.
- Treatments under drip irrigation were non-conclusive.
- Site: Paramount Farms - Belridge, CA (Kern county).
- At the start of the trial the orchard was 13 years old and highly productive.
- Average 3 - year yields were 3,500 lbs of kernel per acre per year.
- Had received 200 lbs K/acre/year the previous three years.
- Average ammonium acetate extractable K of 107 ppm in top 18 inches and 79 ppm in the 18 to 36 inch depth.
- July leaf tissue K levels average 1.2%.