Wheat Nitrogen Ramp
Parkland Crop Diversification Foundation
To assess the economic and agronomic impact of a 6-year rotation, using integrated management practices.
The spring wheat yields shown in Tables 1 indicate a responsiveness to added nitrogen over the amount provided by the green manure in 2018. Table 1 appears to indicate a decrease in yield for treatment 4; however, the reduced yield for that treatment can be attributed to poorer plant establishment in some plots. The dotted, red trend-line shows the general trend for yield.
The use of green manures for fertility has the potential to reduce fertilizer inputs during the cropping year. In 2019, wheat was planted after a green manure in 2018. The nitrogen fertility levels between treatments are compared in Table 2, along with the cost of nitrogen additions per treatment.