CONTENTS 



INTRODUCTION 1 



CONDITIONS, MATERIALS, FUMIGATION METHODS 2 



WEED CONTROL 4 



Methods 4 



Effects on Weed Populations 4 



Effects on Weed Control Costs 7 



DISEASE CONTROL 9 



Methods 9 



Effects on Seedling Production 9 



Seed Cost Savings 11 



SEEDLING GROWTH 12 



Methods 12 



Effects on Seedling Size 12 



OUT PLANTING SURVIVAL 17 



Methods 17 



Effects on Survival 18 



DISCUSSION AND CONCLUSIONS 19 



The use of trade, firm, or corporation names in this publication is for the information and con- 

 venience of the reader. Such use does not constitute an official endorsement or approval by the 

 U. S. Department of Agriculture of any product or service to the exclusion of others which may 

 be suitable. 



