Image credits

Phosphorus deficiency in winter wheat: dull, dark older leaves with purple and red tints.

Title: Winther wheat of phosphorus deficiency, symptoms on leaves

Creator: Agronom

Licence: CC BY-SA 3.0

Source: Wikimedia Commons

Changes: Resized and converted to WebP.

Licence evidence: Licence (CC BY-SA 3.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Wheat guide , Phosphorus guide

Phosphorus response in a maize trial: tall plants got band-placed phosphorus at planting; the short, stunted plants got none.

Title: 2005 1223 Effect of starter P fertilizer

Creator: Alandmanson

Licence: CC0 1.0 (public domain dedication)

Source: Wikimedia Commons

Changes: Resized and converted to WebP.

Licence evidence: Licence (CC0 1.0 (public domain dedication)) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Phosphorus guide

Nitrogen deficiency in a bean plant (Phaseolus vulgaris): the whole plant is pale and yellow-green, with older leaves affected first.

Title: Phaseolus vulgaris nitrogen deficiency

Creator: Rasbak

Licence: CC BY-SA 3.0

Source: Wikimedia Commons

Changes: Resized and converted to WebP.

Licence evidence: Licence (CC BY-SA 3.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Nitrogen guide

Potassium deficiency in dry bean, a pulse: two varieties on the same low-potassium soil, one showing severe yellowing.

Title: K-deficient dry bean 1 2012 02 16 Cedara 055

Creator: Alandmanson

Licence: CC BY-SA 4.0

Source: Wikimedia Commons

Changes: Resized and converted to WebP.

Licence evidence: Licence (CC BY-SA 4.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Pulses guide , Potassium guide

Potassium deficiency in potato: older leaves scorch and brown from the margins inwards.

Title: Potassium deficiency in potatoes

Creator: Simranpreetsidhu

Licence: CC BY-SA 4.0

Source: Wikimedia Commons

Changes: Resized and converted to WebP.

Licence evidence: Licence (CC BY-SA 4.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Potassium guide

Sulphur deficiency in young maize: yellowing shows first on the youngest leaves.

Title: Sulfur deficient corn in the Coastal Plain of North Carolina

Creator: C. Crozier, SoilScience.info

Licence: CC BY 2.0

Source: Flickr

Changes: Resized and converted to WebP.

Licence evidence: Licence (CC BY 2.0) checked on the Flickr photo page, which links to the Creative Commons deed, before use (last checked 7 October 2026).

Used on: Sulphur guide

Zinc deficiency in maize: broad pale stripes on the leaves of young plants.

Title: Maize of Zn deficiency, symptoms on leaves

Creator: Agronom

Licence: CC BY-SA 3.0

Source: Wikimedia Commons

Changes: Resized and converted to WebP; cropped for display on the home page.

Licence evidence: Licence (CC BY-SA 3.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Zinc guide

Leonardite, a weathered lignite and one of the materials commercial humates are extracted from. Specimen from North Dakota, USA.

Title: Leonardite (Sentinel Butte Formation, Paleocene; Stony Creek Mine, North Dakota, USA) 2

Creator: James St. John

Licence: CC BY 2.0

Source: Wikimedia Commons

Changes: Resized and converted to WebP.

Licence evidence: Licence (CC BY 2.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Humic substances and humate guide

Field of wheat.

Title: CSIRO ScienceImage 1765 Field of wheat

Creator: Malcolm Paterson, CSIRO

Licence: CC BY 3.0

Source: Wikimedia Commons

Changes: Resized, converted to WebP and cropped for display.

Licence evidence: Licence (CC BY 3.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Home page , Wheat guide

Rainbow over a field of lupins, Jennacubbine, Western Australia.

Title: CSIRO ScienceImage 1474 Jennacubbine WA Rainbow over Lupins

Creator: Rick Horbury, CSIRO

Licence: CC BY 3.0

Source: Wikimedia Commons

Changes: Resized and converted to WebP; cropped for display on the home page.

Licence evidence: CC BY 3.0 shown on the Wikimedia Commons file page and in its licence metadata; the original is from CSIRO ScienceImage (scienceimage.csiro.au/image/1474), credited to Rick Horbury, CSIRO. Checked 7 October 2026.

Used on: Home page

Chickpeas in a glasshouse.

Title: CSIRO ScienceImage 3196 Chickpeas in glasshouse

Creator: Carl Davies, CSIRO

Licence: CC BY 3.0

Source: Wikimedia Commons

Changes: Resized, converted to WebP and cropped for display.

Licence evidence: Licence (CC BY 3.0) and author checked on the Wikimedia Commons file page, including its machine-readable licence data, before use (last checked 7 October 2026).

Used on: Home page , Pulses guide

Field Spears soil testing kit.

Credit: Image: Red Earth Ag

Rights: Product image of Field Spears, an LCF Australia product sold through Red Earth Ag. Used to show our product; credited "Image: Red Earth Ag".

Source: Red Earth Ag, Field Spears product page

Changes: Image data removed and converted to WebP.

Used on: Testing equipment