Yield of soybean genotypes identified through GGE biplot and path analysis.

Genotype x environment (GxE) interaction is an important source of variation in soybean yield, which can significantly influence selection in breeding programs. This study aimed to select superior soybean genotypes for performance and yield stability, from data from multienvironment trials (METs), through GGE biplot analysis that combines the main effects of the genotype (G) plus the genotype-by-environment (G×E) interaction. As well as, through path analysis, determine the direct and indirect influences of yield components on soybean grain yield, as a genotype selection strategy

Estimated flood peak discharges on Twin, Brock, and Lightning creeks, southwest Oklahoma City, Oklahoma, May 8, 1993 /

Shipping list no.: 97-0036-P.Includes bibliographical references (p. 29).Mode of access: Internet

Factors influencing organochlorine uptake in age-0 brown trout (Salmo trutta) in lotic environments

In 1994 and 1995, we investigated the relationship between stream morphology and water chemistry and levels of organochlorines (HCB, PCB, and DDT) in young-of-the-year brown trout (Salmo trutta) from 25 streams in southern Sweden. Contrary to earlier findings for lakes, we found a positive relationship between trophic status (total phosphorus) and uptake of persistent pollutants in stream biota (trout). This difference between benthic, stream environments and pelagic, lake environments may be related to processes affecting pollutant uptake, i.e., pollutant "spiralling" or the shift from heterotrophy to autotrophy in streams. Land use in the catchment area of the streams also affected pollutant levels in trout, with higher levels in agricultural landscapes and lower levels in forested areas. Size of catchment area, however, did not influence uptake of pollutants in trout. The results indicate that eutrophication of streams by agricultural activities and excessive nutrient loading may increase uptake of persistent pollutants in stream biota

Changes in flow in the Beaver-North Canadian River basin upstream from Canton Lake, western Oklahoma /

Shipping list no.: 97-0178-P.Includes bibliographical references (p. 57-58).Mode of access: Internet