. Bulletin. Natural history; Natural history. 358 Illinois Natural History Survey Bulletin Vol. 27, Art. 5. Fig. 7.—Lauderdale Pond, August, 1950, with surface partially covered with a growth of filamentous algae, after the pond had been fertilized. ported by Patriarche k Ball (1949:29) in southern Michigan, by Surber (1945: 388) in West Virginia, by Zeller (1953: 286) in Missouri, and by Smith & Swingle (1942) in Alabama. Bottom-inhabiting filamentous algae (unidentified) were sometimes present in both fertilized and unfertilized ponds at Dixon Springs, but usually for only brief periods.
. Bulletin. Natural history; Natural history. 358 Illinois Natural History Survey Bulletin Vol. 27, Art. 5. Fig. 7.—Lauderdale Pond, August, 1950, with surface partially covered with a growth of filamentous algae, after the pond had been fertilized. ported by Patriarche k Ball (1949:29) in southern Michigan, by Surber (1945: 388) in West Virginia, by Zeller (1953: 286) in Missouri, and by Smith & Swingle (1942) in Alabama. Bottom-inhabiting filamentous algae (unidentified) were sometimes present in both fertilized and unfertilized ponds at Dixon Springs, but usually for only brief periods. However, such algae were found to be a nuisance to fishermen at Lauder- dale throughout the summer of 1952. Dense stands of Chara in the three fer- tilized ponds died in 1947, after three fertilizer applications; for as long as fer- tilizer was used (from the spring of 1947 through the summer of 1953) this plant remained extremely scarce. Chara nearly covered the bottoms of the three control ponds throughout the study. An increase in abundance of Chara was seen in Lauder- dale, Hooker, and Phelps during 1954 and 1955, the first years after 1947 in which no fertilizer was used ; however, in 1956 Chara had still not regained its prefertilization abundance. The disappearance of submerged weeds in ponds treated with chemical fertilizers was observed by Swingle & Smith (1942). These authors recommended winter fer- tilization to destroy undesirable sub- merged aquatic plants and periodic fer- tilization to prevent their re-establishment. Surber (1948^) reported that a variety of rooted aquatic plants had been killed after use of a chemical fertilizer at Deer Lake, New Jersey. Ball & Tanner (1951:11) found that chemical fertilizer all but destroyed Chara and Potamogeton in North Twin Lake, Michigan, but that each returned to its former abundance the year following termination of fertilization of the lake. POND FERTILIZATION AND FISHING SUCCESS The pond fertilization program
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