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Pistachios



The Ins and Outs of Pistachio Nutrition

The Ins and Outs of Pistachio Nutrients

By Cecilia Parsons, Associate Editor

Think of the nutrients in orchard soil as a ‘bank balance.” Tree roots access the ‘money’ in the soil, using water and oxygen as their passbook.   In a presentation at the 2017 Pistachio Short Course, University of California (UC) Davis plant scientist Patrick Brown explained the basics of plant nutrition including how nutrients are acquired by plants and the when and where of tree nutrition—basic principles necessary to crop production.   Nutrition 101   Nutrients are taken up in water only by active roots on trees with leaves. While the size of the nutrient pool is the bank balance, withdrawals from the bank are limited by the solubility of the nutrients in the pool. Soil pH, minerals, lime, cation exchange capacity  (CEC) and organic matter determine solubility and soils must allow for root penetration plus provide adequate water and oxygen for root growth.   The pH range of 6.5...

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Nutrient Management of Zinc in Pistachios

By Sabrina Hill, Contributing Writer

Zinc is among the most likely deficient micronutrients for pistachios in the California growing areas, but there are ways for growers to monitor, prevent, and treat low zinc levels in the orchard. As summer progresses, growers should be considering leaf sampling to check for zinc deficiency in the orchard.   Author’s note: Information herein was collected from scholarly papers and presentations by University of California (UC) advisors Bob Beede, Brent Holtz, and Craig Kallsen.   Importance of Zinc Zinc is necessary for formulation of Auxin, which plays a role in cell elongation and the forming of chloroplast. It is needed for the development of pollen, along with flower bud differentiation and fruit set.   Factors and Signs of Zinc Deficiency There are several factors relating to zinc deficiency in pistachios and other nut crops. First, cut areas are more likely to be deficient. In addition, zinc has restricted solubility...

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