P. Loro1, W. Brown2 and C. Everett1
Abstract: Preplant and post-emergence application of liquid dairy manure to barley were compared to inorganic-N fertilizer at three rates in the field. The experimental set up was a 3 x 3 factorial randomized complete block design with a control and 4 replicates. The factors were N source (broadcast preplant NH4NO3, preplant manure and post-emergence manure) and N application rate (low, medium and high). The post-emergence manure treatments were applied at the 4 to 5 leaf growth stage of barley. Barley yield and protein contents were measured. Statistical analyses showed that there were no significant treatment differences in yield but that the preplant N-fertilizer and manure treatments resulted in significantly higher barley protein content than the post-emergence manure treatment and the control. The repeated yearly applications of manure at this site resulted in high soil fertility levels that overshadowed any yield response to N fertilizer. Post-emergence application of manure to barley is a promising alternative for spring application of manure although more detailed data on yield loss in the wheel tracks are required to establish its significance at the field scale.
1Land Resources Branch, NBDARD, Fredericton, NB E3B 5H1
2Regional Office, NBDARD, Sussex, NB E4E 7H7