The Influence of Fertilizer Placement on Crop and Weed Ecology in Direct-seeding Systems
Assess the impact of fertilizer placement on weeds in no-till seeding systems.
IPNI-1996-CAN-MB9
01 Mar 1999
1998 Annual Interpretive Summary
The Influence of Fertilizer Placement on Crop and Weed Ecology in Direct-Seeding Systems, 1998
Time of fertilizer application and type of placement can increase the crop’s ability to compete with weeds. A prairie-wide study is comparing spring and fall fertilizer application and herbicide rates in wheat and canola. Results show that herbicide rates can be reduced when used with N fertilization without reducing crop yields.
A subset of the above study has been evaluating the effect of P and K on the competitiveness of spring wheat and flax against wild oats for two years. No particular rate or placement has given a competitive advantage to the crop. Wild oat appears to have a greater ability to take up P and K than either wheat or flax. In this study flax has not been responsive to P or K. Wheat yields increased with high rates of P. Potassium increased wheat yields when soil K was low, but tended to depress yields when soil K was high. The negative impact may have been due to the particular variety of wheat used in the study. MB-09