September 13, 2016

Potassium (K)

A primary plant nutrient, especially important for developing strong roots and stems. In fertilizers, usually expressed as potash.

Fertilizer Basics
Manure and Compost as Nutrient Sources
Glossary: Macronutrients
From a management perspective only, the primary nutrients are N, P, and K, because they are most often limiting from a crop production standpoint. All of the other essential macronutrient elements are secondary nutrients because they are rarely limiting, and more rarely added to soils as fertilizers.
Glossary: Fertilizer analysis
Phosphorus (P) Fallacies
A brief review of the macronutrients included in complete fertilizers: nitrogen (N) is involved in photosynthesis as part of the chlorophyll molecule and promotes vegetative growth; phosphorus (P) supports the transfer of energy throughout the plant for root development and flowering; and potassium (K) is an important part of plant metabolism, strengthening its overall health.