01955nam a2200133 a 450000100080000000500110000800800410001910000180006024501340007826000370021230000090024950000190025852015440027713315472002-11-22       1970    bl uuuu  m   00u1 u    #d1 aSOARES, W. V.  aCation exchange capacity relationships in the buxton, charlton and suffield soil series as influenced by organic matter and lime.  aOrono: University of Mainec1970  a85p.  aTese Mestrado.  aIn the Buxton and Suffield soils with organic matter present, KC1-CEC accounted for 35.5 and 73.3% of the total CEC at the zero and at the highest lime levels, respectively. The pH-dependent CEC decreased correspondingly and the total CEC was not affected significantly by rate of liming. Highly significant correlation coefficients were obtained-for the relationship of KC1-CEC to pH (r = 0.944) and for pH-dependent CEC to pH (r = 0,953). On the average, for each unit increase in pH, KC1-CEC increased 4.375 m.e. and pH-dependent CEC decreased 3.879 m.e./100 g. of soil, in the range from pH 5.16 to pH 6.98. After organic matter removal the effects of liming on other variables were less pronunced. The coefficients of correlation for KC1-CEC to decrease 27 and 76% at the zero and at the highest lime levels, respectively. The pH-dependent CEC decreased 40% in the unlimed soil and it did not vary significantly at the highest lime level. In the Charlton soil, with organic matter present, KC1-CEC accounted for 17 and 65% of the CEC, respectivvely, at the zero and at the highest lime levels. The pH-dependent CEC decreased correspondingly and total CEC increased by 4 m.e./100 g. of soil when 40,000 pounds of lime were applied to the soil. Correlation coefficients for the relationship of KC1-CEC to pH (r = 0.926) and for pH-dependent CEC to pH(r = -0.969) were highly significant. On the average, for each unit increase in pH, KC1-CEC increased 5.840 m.e. and pH-dependent CEC decreased 3.748 m.e./100 g.of soil in the ..........