Fertilizer Nitrogen Recovery of Spring Barley.

A research study was conducted at the Aberdeen Research and extension center on a Declo loam (Coarse-loamy, mixed, superactive mesic Xeric Haploacaldics). Preliminary data is only presented as combined data (i.e., stem and spike combined) where other comparisons and analyses are still being conducted. Data from the 2016 season was analyzed by a generalized linear mixed model as cultivar by fertilizer placement with a randomized complete block structure where stage of sampling was treated as a repeated measure. Differences were measured based on cultivar by fertilizer placement (P < 0.05) and fertilizer placement over time (P < 0.05) where higher level interactions (e.g., cultivar by placement by stage, etc.) were not significant. Plant uptake among cultivars varied where uptake averaged across sampling dates indicated Harrington had the lowest recovery and Voyager the highest where Moravian-69 did not differ from either one when the fertilizer was incorporated, but when fertilizer was not incorporated no differences were measured among cultivars Across time, plant recovery was lowest at Feekes 4/5, due to the small biomass at this time, and increased to a maximum at soft dough where fertilizer recovery remained the same at harvest.