Tuesday, November 6, 2007
187-8

Geometric Classification and Principal Component Analysis of Ammonia Volatilization from Fertilized Soils in Florida and Washington.

Guodong Liu1, Yuncong Li1, Kati Migliaccio1, Ying Ouyang2, and Ashok Alva3. (1) Tropical Research and Education Center, University of Florida, 18905 SW 280th Street, Homestead, FL 33031, (2) Florida, State Government, Department of Water Resources, Po Box 1429 Sjrwmd, Palatka, FL 32178-1429, (3) USDA-ARS, USDA-ARS Vegetable and Forage Crops Research, 24106 N. Bunn Road, Prosser, WA 99350-9687

Abstract The goal of this study was to identify the primary factors affecting NH3 emission from fertilized soils in potato production fields using principal component analysis (PCA). A dataset consisting of 14 different variables and 1800 NH3 emission rates was geometrically classified for analysis. The data used in this analysis originated from an incubation experiment using four major potato production soils (two from Washington State and two from Florida), five N sources, two soil water regimes, three incubation temperatures and five measurements during a 28 day incubation. Results indicated that NH3 emission rates could be classified into five distinct emission zones. Soil particle size distribution and bulk density accounted for 47% of the total variance in NH3 emission. Fertilizer and soil pH accounted for 15% of the total variance. Temperature and soil water regime ranked as the next principal components in the order for their respective contribution to NH3 emission. Thus, the NH3 emissions could potentially be reduced with optimal management of soil, fertilizer type, and soil water regime in agricultural practices.

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