OMAFRA fertilizer guidelines, which can be found in Publication , are based on the sufficiency approach, which provides the greatest potential economic response in a given year based on crop and soil test level. Depending on your situation, you may want to invest in raising soil test levels for phosphorus or potassium. The same was true for potassium when levels were between ppm. It is generally assumed that the following amounts are required above crop removal to move soil test values up by 1 ppm:. These values are guidelines and can vary depending on a variety of factors, including soil type.
In some situations, the amount of nutrient required to raise soil test values may be lower. If you had a field sitting at 10 ppm P and 80 ppm K, P and K above crop removal could be applied over a number of years to reach targets of 15 ppm soil test P and ppm exchangeable K. Variable rate technology is available to apply these nutrients according to where they are needed on the field.
It is important to bear in mind that nutrients behave differently in soil.
Cations and Cation Exchange Capacity
Because of how reactive phosphorus is in the soil, as much P as possible should be banded to provide optimal benefit to the crop in the growing year. If phosphorus is broadcasted, it should be done so during a time period when risk of soil and nutrient loss due to runoff is low e. Consider alternative nutrient sources as well if they are available in your area.
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