Key Points
- These trials were established to evaluate the optimum N timing and rate on spring barley yield on irrigated and dryland trials in the 2005 and 2006 seasons.
- In 2006 there was a trend of increased yield with the later split N application of 1/3 at GS22 and 2/3 at GS30 for both trials.
- In 2006 the optimum N rate was 275 kg/ha N (including 123 kg/ha soil mineral N) on the dryland trial with a 10 t/ha yield and 200 kg/ha N (including 88 kg/ha soil mineral N) on the irrigated trial which yielded 11 t/ha.
- In 2005 there was no response to timing of N between sowing and GS30.
- In 2005 with a higher soil mineral N of 153 kg/ha and lower yields (dryland 5.6 t/ha and irrigated 7.8 t/ha) there was no response to applied N on the dryland trial and 0.5 t/ha increase with 45 kg/ha applied N on the irrigated trial.