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Soil Fertility Levels as Influenced by Long‐time Differential Fertilization Practices 1
Author(s) -
Royer A. E.,
Bertramson B. R.,
Mulvey R. R.
Publication year - 1948
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1948.00021962004000080002x
Subject(s) - acknowledgement , german , library science , computer science , linguistics , philosophy , computer security
L~ experiments at Purdue University, Lafayette, Ind., have been conducted to study some practical systems of fertilization and soil management. The fertilizer applications and cropping practices used have been in effect for 30 years. It would seem that this were sufficient time to allow various soil processes to approach equilibrium and-for the fertility to reach different levels due to differential treatmenl~s. The objectives of this study were (a) determine what differences in the levels of total nitrogen, available phosphorus, and exchangeable potassium have resulted from differential fertilization and differences in manurial and crop residue management; and, (b) to prepare a balance sheet of nutrients added and removed in order to show the net gain or loss for each treatment.