Effects of an Evaporation Retardant, a Surfactant, and an Osmotic Agent on Foliar and Root Development of Kentucky Bluegrass¹

Abstract

Synopsis An evaluation of the effects of 3 types of solution‐modifying agents‐evaporation‐retardant, surfactant, and osmotic agent‐on the growth of Kentucky bluegrass in nutrient solutions was made. Variations in osmotic pressure and surface tension of nutrient solutions affected turfgrass production. Increasing osmotic pressure decreased growth of foliage and increased root development. Decreasing surface tension decreased growth of foliage. An evapo‐retardant added to nutrient solutions had little effect on either osmotic pressure or surface tension but increased yields of foliage.

Caloric Values of Organic Matter in Woodland, Swamp, and Lake Soils

“…These results using wettable sand suggest that the wetting agent has a toxic effect on germination. Parr and Nor man ( 1964), Roberts and Hage (1965), and as yet unpublished observations in our laboratory all indicate that various wetting agents exhibit toxic effects on plants grown hydroponically. A fairly high application rate of a wetting agent is less detrimental to plants grown in soil than in solution culture.…”

High alcohols as antitranspirants

“…The 30% increase of dry weight (with respect to the control) found by Roberts and Lage [1965] (Table 1) for Kentucky bluegrass growing in nutrient solution, to which tallow alcohol had been added, appears anomalous and unexplained in view of all the other results quoted above.…”

Influence of nitrogen and potassium on growth, chemical composition and anatomical structure of Agrostis palustris Huds.

“…A preliminary experiment was performed in 1965 using a solution culture technique similar to that employed by Roberts and others (7) (43) (48). Each culture consisted of a glazed crock holding 3800 ml.…”