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absence of limestone annual precipitation APR-effect Arizona data asymptote Clary climax cover climax overstory COV WRITE cover percent data points data set duction ecosystems effect appeared Estimates of specific Experiment Station FLORNL Forest and Range forms and scales Fortran IV computer Fortran IV program grassland herbage production potential herbage production value IAPR Idaho IDOK independent variables INFLECTION POINTS Intermountain Station IPCOV IPSOI Jensen and Homeyer Juniper Areas kg/ha LB/ACRE LIME limestone soils limited APR-range Mathematical Hypothesis mathematical model Montana in cooperation Nevada nitrate-nitrogen nitrification NL NL NL NO3 levels NON-LIME NONLIMESTONE SOILS north-central Arizona pinyon-juniper areas potential herbage production Potential on Pinyon presence or absence PRNT IDOKTR program for table region of limited rescaling refit sigmoidal forms SIGMOIDS OVER COVER Soil nitrates soil parent material table output tree cover Utah in cooperation YPAPR YPCL YPCNL