Fertility and Nutrients
Make the most of your fertilizer dollars
By Top Crop Manager
May 2, 2016 - An Alberta Agriculture and Forestry (AF) specialist is recommending three tools he says can be a big help with controlling fertilizer costs.
"Soil testing is one of three tools you can use to make your fertilizer dollar stretch farther," says Harry Brook, crop specialist, AF, Stettler. "The other two tools in the box are the Nutrient Use Calculator and the AFFIRM fertilizer program, both available free from AF. Fertilizer costs are one of the most expensive inputs for annual crops. Shouldn't you do everything within your power to improve your bottom line?"
Brook says a sound management decision on what to spend on fertilizer needs good information.
"A soil test, in the spring, can give you a good understanding of the average level of nutrients in your field. It's important to get a good, representative sample to accurately predict the average supply of macronutrients in the soil. This means multiple samples taken from the field in different locations and mixed together. The sample sent to the labs is taken from this larger, mixed sample."
Any farm commodity sold off the farm is composed of nutrients that are exported. A big crop of canola or wheat removes a lot of nitrogen, phosphorus, potassium and sulfur as well as small amounts of trace minerals.
"Knowing how much goes into a crop can be used as a guideline to decide how much fertilizer you'll need to provide to get your target yield of a crop this year. The Grains, Forage and Straw Nutrient Use Calculator on AF's website easily gives you that information, breaking down nutrients for the straw and the grain. You fill in the expected yield and it will give you the macronutrient use in that crop. If your crop takes out 100 pounds/acre on nitrogen and you're only putting 60 pounds on, then the rest is coming from the organic matter in the soil and will have to be replaced some time."
The AFFIRM software program is also on the AF website under Decision Making Tools.
"It's a free download where you put in the soil test results, last year's crop and yield, this year's crop and expected yield, and it generates a soil fertilizer recommendation. It also allows you to adjust the moisture conditions, fertilizer budget and minimum return expected per dollar spent on fertilizer, and then generates a nutrient blend that meets those conditions.
"Combine the soil test, the Grains, Forage and Straw Nutrient Use Calculator and AFFIRM together to help make the wisest fertilizer decisions and get the biggest bang for your fertilizer investment," adds Brook.