Fig. 1.

Means ( ± standard errors) for plant dry weight produced at either 28 (a–f) or 76 (g–l) days after emergence by the various plant species grown on media treated with variable amounts of gray or red fly ash applied to growth media before planting. Open bars are means for the respective plant species on media not supplied with fly ash.

 


Fig. 2.

Means ( ± standard errors) for the growth variables in barley (circles), radish (squares), and lucerne (triangle) in response to variable amounts of gray fly ash (closed symbols) or red fly ash (open symbols) applied to growth media before planting: plant growth rate (a) and relative growth rate (b). Open symbols with crosshair are means for the respective plant species on media not supplied with fly ash.

 


Fig. 3.

Means ( ± standard errors) for concentrations of photosynthetic pigments in the leaves of barley (a–c), radish (d–f), and lucerne (g–i) measured at 76 d after sowing in response to amounts of either gray or red fly ash applied to growth media before planting: chlorophyll a (a, d, and g), chlorophyll b (b, e, and h), and carotenoids (c, f, and i)). Open bars are means for the respective plant species on media not supplied with fly ash.

 


Fig. 4.

Means ( ± standard errors) for the photosynthetic process for barley (circles) and radish (squares) measured at 65 d after sowing in response to amounts of gray flash ash (closed symbols) or red fly ash (open symbols) applied to growth media before planting: (a) rate of carbon dioxide assimilation (A) and (b) rate of transpiration. Open symbols with crosshair are means for the respective plant species on media not supplied with fly ash.