. The Canadian field-naturalist. . A SINUS LENGTH B SINUS WIDTH C BLADE WIDTH D BLADE LENGTH E PETIOLE LENGTH dry-ashed at 500°C for 6 hours in a muffle furnace, total cations of the ash were then extracted with 6N HCl (Jackson 1965). Available soil cations were extracted by the centrifuge method using IN ammo- nium acetate (Jackson 1965). Sodium, magnesium, and calcium were then determined by atomic absorp- tion mode and potassium by flame emission mode using a Jarrel-Ash flame spectrophotometer model 82-270. Soil and plant phosphorus was determined using the method described in McKeague (197
. The Canadian field-naturalist. . A SINUS LENGTH B SINUS WIDTH C BLADE WIDTH D BLADE LENGTH E PETIOLE LENGTH dry-ashed at 500°C for 6 hours in a muffle furnace, total cations of the ash were then extracted with 6N HCl (Jackson 1965). Available soil cations were extracted by the centrifuge method using IN ammo- nium acetate (Jackson 1965). Sodium, magnesium, and calcium were then determined by atomic absorp- tion mode and potassium by flame emission mode using a Jarrel-Ash flame spectrophotometer model 82-270. Soil and plant phosphorus was determined using the method described in McKeague (1976) a modification of that described by Olson and Dean (1965). Soil and plant nitrogen were determined by the micro-Kjeldahl method (Jackson 1965). Statistical analysis of the data used the SPSS pro- gram offered by the Carleton University Honeywell CP-V computer. t-Tests were done to determine whether there were any significant differences existing in the means of the various parameters. Correlation coefficients ('r') were calculated using the Pearson Correlation mode of the same program. The signifi- cance(s) is presented as a 3-digit figure between 0 and 1. These figures represent the probability that the result (, the correlation coefficient or t value) is due to chance. Therefore, the closer these figures are to 0 the more significant is the result. For this study proba- bilities less than were considered significant. Results Water Along the Jock River, water quality is highly varia- ble. Rate of flow varies from spring flood to nearly stagnant in the back waters at the time of sampling. Nonetheless the water does move and thus changes on each site as time elapses. At time of sampling pH was circumneutral showing a range of , with a pH of the most common reading. Oxygen content of water measured ppm, while the water depth range was 15-90 cm, including the unvegetated sites. A measureable flow was found on only three sites and even there flow w
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