Nutrient Management Practices Used in Potato Production In Idaho

Abstract

Sound nutrient-management practices are an essential component of modern intensive potato (Solanum tuberosum) production systems. Economic and environmental issues are requiring Idaho potato producers to use management practices that are effective and efficient to remain competitive in the market. Identical potato production management surveys were conducted in 1997 and again in 2006–2007 to determine current nutrient management practices used by Idaho potato growers. This Dillman mail-based survey collected data that were used to determine current nutrient-management strategies and changes that have occurred over the past 10 years. In 2006–2007, more than 77% of growers used preplant soil tests for determining nitrogen (N) application needs. More than 96% of potato growers relied on petiole analysis of potato plant tissue for N management during the growing season. Changes have occurred in only 7 of 28 nutrient-management categories evaluated in the past 10 years, indicating maturity rather than evolution in nutrient management strategies for potatoes. Over the past 10 years, application rates of N have decreased, while potassium (K) rates have increased. There has been a decrease in the number of growers who plant legumes in crop rotation as a source of N. The use of nitrification inhibitors, precision fertilizer management, and application of manure to potato fields has increased in the past 10 years. The overall lack of changes in nutrient management in the past 10 years may indicate that nutrient-management strategies for potatoes in Idaho are mature and successful.

Keywords:

• Micronutrient management
• nitrogen management
• phosphorus management
• plant tissue diagnosis
• potassium management