Key Points
- At trial sites with medium levels of soil mineral N in late winter, withholding N applications until GS32 produced a ‘thinner’ crop but did not affect yield, protein, heads/m2 at harvest, TGW or screenings.
- The highest rate of N decreased yield. The rates suggested by either of the two decision support systems were more economic than other, higher, rates. Soil mineral N tests are needed to assist growers with their nitrogen decisions regarding timing and rate.