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Restoring Productivity to Leveled Land
Author(s) -
Reuss J. O.,
Campbell R. E.
Publication year - 1961
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1961.03615995002500040021x
Subject(s) - subsoil , environmental science , phosphorus , agronomy , limiting , fertilizer , manure , productivity , nitrogen , greenhouse gas , greenhouse , field experiment , soil water , soil science , chemistry , biology , ecology , mechanical engineering , macroeconomics , organic chemistry , engineering , economics
Field and greenhouse fertilizer tests on subsoils of the Yellowstone Valley which had been exposed by land leveling operations indicate that these subsoils are very deficient in N and P. This conclusion is substantiated by soil analyses. In the greenhouse, yields of barley on untreated subsoil were low, but excellent yields resulted when both N and P were supplied. Nitrogen alone was not effective. Excellent yields of corn were obtained in the field when adequate N and P were supplied or where heavy rates of manure were plowed down. Field response to N alone was good but generally less than that obtained by the combination. Phosphorus used alone did not increase crop yields. Neither physical properties nor minor elements were found to be limiting.