The prices of potassium (K) fertilizer and other fertilizers have increased significantly during the last two years. Profitable crop production requires appropriate soil K levels so careful fertilization planning is required. Iowa State University soil-test interpretations and fertilizer recommendations were updated in November 2002. Two important changes were to recommend higher soil-test K (STK) levels for optimum yield of Iowa crops and to suggest efficient K fertilizer application methods for some conservation tillage systems.
Iowa State University
Mallarino, Antonio P., "Plan carefully for potassium fertilization this fall" (2005). Integrated Crop Management News. 1450.
The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit https://crops.extension.iastate.edu/.