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COLORADO SCHOOL OF MINES RESEARCH INSTITUTE <br />CONTENTS <br />Page <br />INTRODUCTION 1 <br />REVIEW OF LITERATURE 2 <br />METHODS 4 <br />Plot Design and Construction 4 <br />Seedbed Preparation 6 <br />Seeding 6 <br />Plot Maintenance 7 <br />Data Acquisition 7 <br />Production 7 <br />Cover 8 <br />Rooting Depth 8 <br />Plant Establishment and Tillering 8 <br />Water Infiltration 8 <br />Soil Sampling 9 <br />Temperature 9 <br />Plant Tissue Analysis 9 <br />Data Reduction and Statistical Techniques 9 <br />RESULTS AND DISCUSSION 11 <br />Plots with Type I Spoil 11 <br />Spoil and Soil Traits 11 <br />Production as a Function of Soil Depth 15 <br />Percentage Cover as a Function of Soil Depth 18 <br />Rooting Depth 19 <br />Plant Quality 19 <br />Microbiological Parameters 23 <br />Discussion 24 <br />Plots with Type II Spoil 25 <br />Spoil and Soil Traits 25 <br />Sodium Migration 27 <br />Production as a Function of Soil Depth 29 <br />Percentage Cover as a Function of Soil Depth 32 <br />Rooting Depth 34 <br />Plant Quality 34 <br />Microbial Relationships 37 <br />Discussion 37 <br />Plots with Type III Spoil 39 <br />Spoil and Soil Traits 39 <br />Production as a Function of Soil Depth 42 <br />Percentage Cover as a Function of Soil Depth 42 <br />Rooting Depth 45 <br />iii <br />