281-25 Characterizing Spatial Variability of Phosphorus and Potassium Response in Agricultural Landscapes.

Poster Number 2128

See more from this Division: SSSA Division: Soil Fertility & Plant Nutrition
See more from this Session: Soil Fertility and Plant Nutrition Division and Nutrient Management and Soil and Plant Analysis Division Graduate Student Poster Competition (MS degree)

Tuesday, November 5, 2013
Tampa Convention Center, East Exhibit Hall

Mosaed A. Majrashi, Agronomy, Kansas State University, Manhattan, KS, John Randall Nelson, Agronomy, Kansas State University, Courtland, KS and Dorivar A. Ruiz Diaz, Department of Agronomy, Kansas State University, Manhattan, KS
Abstract:
In 2012-13, Research was conducted at the Kansas State University North Central Kansas Experiment field and in cooperation with a producer in Republic County, KS, on fields characterized by high soil variability. In irrigated corn fields, the experimental design consisted of four strip-plots across a field (three P fertilizer rates and a 0 rate control. In irrigated soybean fields, treatments applied in the strip plots included P fertilizer alone, K fertilizer alone, P&K combined, and an utreated control.  Strips were replicated twice across the field.  Geo-referenced soil samples were collected at 100-foot intervals along each strip.  Geo-referenced yield was collected at the same locations.  Soil samples were analyzed for various properties that influence P availability, including: soil test P, soil pH, extractable Al, Fe, and Ca, and organic matter, as well as nitrate-N and soil test K.  Spatial analysis of P and K response will be compared to spatial distribution of soil properties.  This design will allow us to quantify crop response to P and K at varying rates, landscape positions, soil test P and K concentrations, and soil types (comprising variable soil chemical and physical properties).

See more from this Division: SSSA Division: Soil Fertility & Plant Nutrition
See more from this Session: Soil Fertility and Plant Nutrition Division and Nutrient Management and Soil and Plant Analysis Division Graduate Student Poster Competition (MS degree)