Nutrient Management

Examples of corn K deficiency across different soil test K levels (A = 76 ppm, B = 103 ppm, and C = 127 ppm). These images highlight the importance of building soil test K to critical concentrations and maintaining levels within the optimum range to reduce deficiency risk and the likelihood of yield response to fertilization.

Understanding grain nutrient removal for 4R management of phosphorus and potassium

September 30, 2026

Soil organic matter and other soil properties influence the amount of nitrogen that becomes available to crops through mineralization. Measuring or estimating that contribution can help improve fertilizer recommendations. Photo by GEUS/Christian Albers.

Soil N mineralization potential: What it is and why we should measure it

September 21, 2026

Photo by Kenlee Scott.

Nitrogen management for industrial hemp fiber production

August 19, 2026

Figure 1. Classification of plant nutrients according to essentiality, function, mobility, and common uptake forms.

Understanding the foundations of fertilizer recommendations

July 31, 2026

Photo courtesy of Alamy/Grant Heilman Photography.

Optimizing nitrogen management in corn production by location, management, and weather

July 24, 2026

Photo courtesy of Adobe Stock/oticki.

Optimizing winter wheat grain yield and protein concentration with weather-responsive nitrogen management in semi-arid dryland systems

July 10, 2026

Polyhalite is a naturally occurring evaporite mineral composed of potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S) in sulfate form [K₂Ca₂Mg(SO₄)₄·2H₂O].

Polyhalite best management practices

March 26, 2026

Figure 1. Elemental S sources evaluated, illustrating particle size and granulation effects on S oxidation potential.

Elemental sulfur performance depends on source, soil type, and application timing

March 25, 2026

Screenshot of the ManureDB website.

ManureDB: The database for all things manure

March 24, 2026

Nutrient foliar spray in an almond orchard. Photo courtesy of Alamy/Leonard F Wilcox.

Foliar feeding of plant nutrition

February 26, 2026

Certified Crop Adviser Exam Study Tools & Resources

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