soil in farm field

Digging deep for soil phosphorus

Field Notes: P movement is limited in soil, particularly under dry soil conditions

As my PhD work conducted over the past four years reaches its completion, I’ve reflected on my master’s work more in the last few months than I’ve done since completing it nine years ago. In this column, I would like to highlight a few take-home messages from that work. The 4Rs of phosphorus (P) stewardship […] Read more

Understanding phosphorus, part 3: Developing fertilizer recommendations

Understanding phosphorus, part 3: Developing fertilizer recommendations

Agronomy Management: It’s important to have adequate P close to the seed during the first six weeks of growth

Part 3 of 3. Prairie farmers spend over $1 billion annually on phosphate fertilizer; these three articles will hopefully assist with a better understanding of how soil P functions in soil, soil testing for P and then how to develop wise phosphate fertilizer recommendations.


A soil scientist collects a sample from a test plot. The zero- to six-inch depth should be sampled separately from deeper samples to accurately determine P fertilizer requirements.

Understanding soil phosphorus, Part 2: Soil testing for plant-available P

Agronomy Management: The proper test for your soil and region can help answer questions your plants’ roots will ask this season

In my previous Grainews article, I discussed soil phosphorus (P) cycling in soil, effects of crop rotations and fertilizing on soil P, and how crops take up soil P. In this article I’ll discuss soil tests used to estimate plant-available P. Next issue, we’ll discuss how to develop wise phosphate fertilizer recommendations for your farm. […] Read more

Fertilizer in storage at a phosphate plant in North Carolina.

Understanding soil phosphorus, part 1

Agronomy Management: Rotations and fertilizer management have dramatic effects on pools of organic and inorganic P

Farmers and agronomists are very aware that phosphorus (P) is an essential element needed for optimum crop production in Western Canada. Most soils used for annual crops in Western Canada are very low, low or medium in plant-available soil P and are responsive to added P fertilizer. As a result, phosphate fertilizer use is second […] Read more


solubility test

Field Notes: So what about solubility?

While conducting my PhD studies over the past three years, I have been fortunate to do a deep study on phosphorus (P). It is a fascinating nutrient often characterized by a series of seemingly contrasting truths. For example, while it is considered a nutrient essential for all life, it can also act as a pollutant […] Read more

Joseph McKee preps seeding equipment at Stirling, southeast of Lethbridge.

Feeding dry fields

Prairie farmers find more than one way to optimize fertilizer efficiency, whether in dry growing seasons or in any growing season

Farmers and crop consultants in Western Canada have slightly different approaches to manage weather-related fertilizer application risks. With variable moisture, do you apply the full amount at seeding and hope for rain — or find another way? Most producers contacted by Grainews opt for some version of split fertilizer application when facing dry growing conditions […] Read more