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DISTRICT OXNARD WATSONVILLE dS/m EC Average 1.4 Standard Deviation 0.3 Average 1.1 Standard Deviation 0.5 SAR 2.0 0.2 2.5 1.5 Ca 7.2 1.9 3.2 1.5 Mg 3.6 1.0 2.3 1.0 meq/L Na 4.5 0.4 3.9 2.4 CI 1.8 1.3 4.2 2.8 SO₄ 10.3 2.5 1.9 1.1 Table 1. Irrigation water chemical analysis average and standard deviation of 40 fields in the Oxnard and in the Watsonville production districts, year 1 (2016/2017 season). Continued from Page 18 where irrigation water and soil samples were analyzed for salinity composition. Overall, the irrigation water of the fields located in the Oxnard district had greater electrical conductivity and significantly greater sulfate levels, while chloride levels in the Watsonville fields were twice as great as the Oxnard fields (Table 1). These results were used as the benchmark for determining the treatments of the salinity tolerance experiment conducted the following year. The second year of the study consisted of an experiment conducted in a commercial field located in Oxnard, California during the 2017/2018 production season. Strawberry yield, soil salinity and salts content in leaf blades of the two most popular public cultivars in Oxnard (cv. Fronteras) and in Watsonville (cv. Monterey) were assessed under eight salinity treatments following a randomized complete block design. Each plot was 30 feet long and 1 bed wide (64 inches), with four plant rows, approximately 90 plants/plot, and two high flow drip tapes (0.67 gpm/100ft) placed about 1.5 inch deep between the 1st and 2nd, and between 3rd and 4th plant rows. The experiment was planted on October 2017, and the treatments started approximately a month post-planting in order to promote a good establishment Bring the heat on hard-to-kill weeds and insects with of the crop; during that period, overhead micro-sprinklers was the predominant irrigation method. Drip irrigation amounts and timing were decided based on ETc estimations from the California Irrigation Management Information System (CIMIS station # 152) weather station, and matric potential readings from tensiometers, respectively. Water-powered injection pumps (Figure 1) blended the well water with concentrated salt solutions formulated for each treatment at a 1:100 ratio during every drip irrigation event from November 2017 to June Continued on Page 22 TM d-LIMONENE ADJUVANT 100% Active Ingredient! Spreader-Activator with Citrus Extract R-Agent DL ® dramatically boosts performance. Use R-Agent DL with and without oil on agricultural, turf, ornamental, and non-cropland sites. For more information: email: tom@chemurgic.net Tom Kelm: 559 696-6558 Photo Courtesy of Andre Biscaro. Figure 1. Picture of experiment site with water-powered injectors mounted on top of 55 gallons containers of each treatment, with experiment plots in the background. 20 Progressive Crop Consultant September /October 2019 Distributed by Chemurgic Agricultural Chemicals, Inc. P.O. Box 2106 • Turlock, CA 95381 www.chemurgic.net • Adjuvants • Nutrients • Organics • Formulation Services
COMPOST 100% Fully Composted Dairy Manure The Leaders in Dairy Compost Manufacturing Custom Blending Available Gypsum - Limestone - Sulfur YOU CALL, WE HAUL Servicing the Valley since 1925 559-686-5707 What can Cain do for you? Ask us about our Dust Control September and /October Fertilizer 2019 www.progressivecrop.com Products. 21
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