This is a file from the Wikimedia Commons and may be used by other projects. Information from its description page there is shown below. Commons is a freely licensed media file repository.
English: Potassium deficiency in cabbage; from a field trial at Cedara, KwaZulu-Natal. The plant on the left is deficient in K, and the plant on the right was fertilized with KCl fertilizer; Plants were planted at the same time in adjacent plots. K-deficiency symptoms visible are chlorosis of the oldest leaves and necrosis on the edges of those leaves.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.