Abstract
Abstract Two fertilizer studies were conducted on mature vineyards established with a water harvesting system on a White House sandy loam (fine, mixed, thermic, Ustollic Haplargid) soil at the University of Arizona Oracle Agricultural Center. In one study, two grape (Vitis vinifera L.) cultivars, ‘Cabernet Sauvignon’ and ‘Sauvignon blanc’, were treated with different levels of 15N and P fertilizer and tested for tissue NO3‐N and total‐P content. In second study, eleven grape varieties were treated with three levels of N. Tissue samples were analysed for total P and NO3‐N content, and the ratio of petiole‐P to leaf blade‐P was determined. When sufficient quantities of both nutrients were provided, N and P interacted positively resulting in increased grape yields. The petiole‐P to leaf blade‐P ratio correctly monitored the P status of the vines.
Published Version
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