Research is underway in the California and Arizona low deserts in site specific applications of phosphorus in winter vegetable production to determine if the process can more precisely deliver P to the plant, reduce phosphorus use overall, and provide an economic benefit to growers.
From left - Charles Sanchez, Pedro Andrade, and John Heun of the University of Arizona this fall launched a three-year project on the site specific application of phosphorus in winter vegetable production in Southern California and southwestern Arizona. Not pictured is the UA's Kurt Nolte.
Charles Sanchez brings decades of phosphorus research experience to the project.
Pedro Andrade of the University of Arizona will use the Veris 3100 and the EM38 to determine soil texture variability in the crop rooting zone.
John Heun demonstrates the Trimble FMX which has software to read prescription maps and trigger equipment to apply phosphorus as needed in the field.
Andrade and Heun hold the EM38 unit.
A Gandy spreader will dispense phosphorus granules based on software instructions.