Though results are preliminary, representing only the first year of work, a research project studying micronutrient utilization by juice grapevines has found that timing and the combination of nutrients can make a difference in plant response. Washington State University soil scientist Dr. Joan Davenport and her colleagues at WSU’s Irrigated Agriculture Research and Extension Center at Prosser are evaluating the micronutrient utilization of boron, copper, and zinc in Concord grapes by comparing foliar to broadcast application, timing (early leaf stage or bloom), and micronutrient combinations. Micronutrient availability is often an issue in eastern Washington’s high pH soils, said Davenport. “Our […]