The wheat was sown on 14 June 1993. Solid symbols are wheat after wheat and open symbols are wheat after chickpeas. Wheat yields responded to applied nitrogen in 1995 when there wasn't much available from the previous chickpea crop, but only slightly in 1993 when there was lots. Grain yield and grain protein of Amery wheat grown in 1995 at Bencubbin with different rates of nitrogen applied at sowing, after either wheat or chickpeas in 1994. The wheat was sown on 25 May 1995.
Solid symbols are wheat after wheat and open symbols are wheat after chickpeas.
The results are shown in Figure 3. Application of nitrogen is definitely profitable after wheat, especially in the high yielding 1995 season, but the application of nitrogen is of dubious profitability after chickpeas. After a chickpea crop in 1992 producing large amounts of nitrogen any nitrogen rate was less profitable than none, even with high wheat prices. Difference in profit due to applying nitrogen to wheat after wheat or chickpeas at Bencubbin in 1995 and 1993. We conclude that growing chickpeas before wheat can lead to useful grain yield and protein increases.