Fertilization of Russet Burbank in short-season environment

Abstract

A three-year investigation determined effects of N, P, K, and S rates on tuber yield and quality, economic return, and plant nutrient status of Russet Burbank grown on mineral soils in the Klamath Basin of Oregon. Yield responses were consistent over years. The highest yields and economic returns were achieved with the combination of 202 kg N, 29 kg P, 56 kg K, and 22 kg S ha-1. Petiole NO3-N concentrations were below published critical levels at the optimal N fertilizer rate of 202 kg N ha-1. Yield and economic return responses to increasing N rates were positive but small. The highest yield occurred at the lowest P rate (29 kg ha-1). Tuber yield, grade, or quality did not respond to K fertilization. Findings suggest that nitrogen fertilizer management based on petiole analysis may require modifications for short growing-season environments.