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Figure 3


Fig. 3. Average yields in USA for soybean, corn, cotton and wheat from 1955 to 2004. Data from annual issues of Crop Production (USDA).





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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome