1 year ago



eturn to table of

eturn to table of contents Convenient Field Grouping While fields have varying fertility needs, similar products and management strategies are often applied to groups of fields that share common attributes, such as land tenure, location, or management history. The Encirca Fertility service allows users to arrange fields into groups to which common management can be applied. Local Encirca Certified Services Agent The Encirca Fertility service includes direct, in-field support from an Encirca certified services agent who works sideby-side with growers to ensure that management decisions are tailored to the unique context of their individual farming operation. SUMMARY The Encirca Fertility service is a new offering from DuPont Pioneer designed to help growers maximize return on P, K, and lime investments. The Fertility service incorporates grower data, Encirca Decision Zones, and university fertility recommendations to estimate nutrient needs and allocate fertilizer based upon potential return on fertilizer investment for each management zone in the field. For growers managing fertility on a tight budget, a unique feature called Opti-Allocate can be used to create fertilizer prescriptions that maximize return on investment for a specific but limited fertilizer expenditure. In conjunction with an Encirca certified service agent, the Encirca Fertility service offers a powerful, flexible solution for soil fertility management. Because Encirca services variable rate applications integrate the agronomic and economic factors that drive profitability, prescriptions can be generated that optimize application rates for any fertility budget. 72

SOIL TEST PHOSPHORUS AND POTASSIUM LEVELS IN THE CORN BELT return to table of contents by Marissah Schulte, Agronomy Sciences Intern, and Andy Heggenstaller, Ph.D., Encirca Services - Commercial Unit Lead BACKGROUND AND OBJECTIVES • Balanced soil fertility management is critical for achieving crop genetic yield potential and maximizing profitability. • Recent evidence suggests that phosphorus (P) and potassium (K) fertilizer rates in some areas may not be keeping pace with increasing crop yields that are accompanied by higher nutrient removal. • The objective of this study was to assess soil fertility levels in Pioneer ® GrowingPoint ® Agronomy on-farm corn research trials and fields enrolled in Encirca℠ Yield services in the Corn Belt. STUDY DESCRIPTION • DuPont Pioneer agronomists and Encirca certified services agents collected soil samples from 8,925 fields in 12 Corn Belt states between fall 2015 and spring 2016. • Soil samples were submitted to Waypoint Analytical for P and K analysis, and test results were compared to university fertility recommendations to determine the percent of samples that fell below state optimum levels. Figure 1. Distribution of the 8,925 fields from which soil samples were collected between fall 2015 and spring 2016 to assess Corn Belt P and K fertility levels. RESULTS Phosphorus Deficient Soils Potassium Deficient Soils Phosphorus Samples Below Optimum per State Values Potassium Samples Below Optimum per State Values 49% 24% 0 - 25% 25 - 50% > 50% 22% 12% 0 - 25% 25 - 50% > 50% 50% 28% 43% 12% 21% 55% 52% 26% 45% 26% 34% 2% 56% 42% 29% 25% 54% 19% 11% 24% Figure 2. Percent of soil samples that fell below state optimum levels for P in the Corn Belt. • Phosphorus deficiency was prevalent throughout the Corn Belt, with the greatest frequency of deficient soils observed in Western Corn Belt states. Figure 3. Percent of soil samples that fell below state optimum levels for K in the Corn Belt. • Potassium deficiency was most frequently observed in the Central Corn Belt and Michigan. Note that universityrecommended optimum K levels are significantly higher in Iowa compared to other states in the region. 73

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