Zinc supply effects on wheat production in a low precipitation zone

Zinc (Zn) fertilization of hard red and soft white winter wheat (Triticum aestivum L.) is uncommon in the low precipitation zone of the inland Pacific Northwest. It is uncommon because there have been no indications of deficiency. Soil test data, however, show Zn levels have been declining over time. We conducted a four-site-year experiment to evaluate effects of fertilization on early-season tissue Zn concentration (TZC), dry matter accumulation (DMA), Zn uptake (ZNU), the grain test weight (TWT), protein content (PRO), and yield (YLD) of two regionally adapted cultivars. Planting occurred late in September or early in October. Zinc fertilizer, placed with the seed while planting, was applied at rates of 0 and 5 kg Zn ha-1. Application of 5 kg Zn ha-1 increased TZC and ZNU at one of two sites. There were corresponding trends of increased DMA and improved YLD. Response to fertilization occurred on a relatively shallow soil that had a diethylenetriamine-pentaacidic acid-extractable Zn test level of 0.3 mg kg-1. Zinc fertilization increased tissue Zn concentration and Zn uptake in winter wheat (Triticum aestivum L.) at one of two experimental sites. There were corresponding treatment-induced trends of increased dry matter accumulation and improved grain yield. Response to fertilization occurred on a relatively shallow soil that had a diethylenetriamine-pentaacidic acid-extractable soil test Zn level of 0.3 mg kg-1. Response to fertilization may have been due, at least in part, to the near-surface position of carbonates and alkalinity.