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Fig. 1. Changes in ammonium lactate–extractable phosphorus (P-AL) as influenced by repeated cropping and fertilization. Level A, no P added; Level B, replacement of P; Level C, replacement + 15 or 20 kg P; Level D, replacement + 30 kg P.





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