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Main Title Comparison of Experimental Designs Used to Detect Changes in Yields of Crops Exposed to Acidic Precipitation.
Author Evans, L. S. ; Thompson, K. H. ;
CORP Author Brookhaven National Lab., Upton, NY. ;Manhattan Coll., Bronx, NY. Lab. of Plant Morphogenesis.;Corvallis Environment Research Lab., OR.
Year Published 1984
Report Number EPA/600/J-84/338;
Stock Number PB86-103140
Additional Subjects Acidity ; Farm crops ; Water pollution ; Air pollution ; Yield ; Exposure ; Comparison ; Experimental design ; pH ; Evaluation ; Field tests ; Reprints ; Acid precipitation ; Glycine max
Library Call Number Additional Info Location Last
NTIS  PB86-103140 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 5p
A comparison of experimental designs used to detect changes in yield of crops exposed to simulated acidic rain was performed. Seed yields were determined from field-grown soybeans(Glycine max) exposed to simulated rainfalls in which all ambient rainfalls were excluded by automatically moveable rainfall exclusion shelters. When all eight, 4 x 4, latin squares were used, simulated rainfalls of pH 4.1, 3.3, and 2.7 exhibited yields 10.6, 16.8, and 23.9%, respectively, below yields of plants exposed to pH 5.6. The linear component of pH treatment differences showed a highly significant decrease in yield (p<0.001). The eight latin squares analyzed as individual experiments yielded erratic conclusions. However, when all eight latin squares were combined a satisfactory evaluation can be made. The low probability value for differences among latin squares (p<0.005) indicates that field locations are a legitimate source of stratification.