2013 Annual Report
1a.Objectives (from AD-416):
ARS is interested in determining chemical properties in tropical soils and in the assessment of elemental composition of tropical plants.
1b.Approach (from AD-416):
Plant (cacao, cover crops) and soil samples of tropical crops will be collected from field studies carried out in Peru and Brazil and will be transported to the U.S. under APHIS soil and plant import permits. Soil chemical (pH, C, N, macro and micro nutrients: N, P, K, Ca, Mg, Na, Zn, Cu, Fe, B, Mn, etc.) and biological properties (microbial biomass- of C, -N, -P) and plant mineral compositions (C, N, Ca, Mg, K, P, Na, S, Al, Zn, Cu, B, Fe, Mn, etc.) will be determined at the University of Florida, Indian River Research and Education Center (IRREC), Fort Pierce, Florida. Soil and plant (cacao, cover crops) samples will be collected from experiments conducted at SPCL facilities at Beltsville, MD. These soil and plant will be analyzed for macro and micronutrients (N, C, Ca, Mg, K, P, Na, Al, Zn, Cu, B, Fe, Mn, etc.) at the University of Florida, IRREC, Fort Pierce, FL.
During this reporting period macro- and micro-element content of cacao grown at varying levels of potassium were analyzed. The plant samples were analyzed for the total concentrations of the following elements P, K, Ca, Mg, Al, B, Cu, Fe, Mn, Na, and Zn. The total amount of nitrogen (N) in the plant tissue and seed samples were also analyzed.