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Changes in DTPA‐Extractable Zinc, Iron, Manganese, and Copper in Soils Following Fertilization
Author(s) -
Follett R. H.,
Lindsay W. L.
Publication year - 1971
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/sssaj1971.03615995003500040034x
Subject(s) - micronutrient , manganese , soil water , zinc , chemistry , copper , human fertilization , fertilizer , avena , agronomy , zoology , environmental chemistry , environmental science , biology , soil science , organic chemistry
Eleven soils were fertilized with Zn, Fe, Mn, and Cu and examined periodically with the DTPA micronutrient soil test. The study continued for 14 weeks while the soils were cropped in the greenhouse first with oats ( Avena sativa ) and then with corn ( Zea mays ). During this period fertilizer Cu declined to 61%, Zn to 44%, and Mn to 14% of their initial values. Only 20% of the Fe added as FeSO 4 · 7H 2 O remained extractable after 1 week. With chelated Fe as FeEDDHA, 70% was extractable at 7 weeks and 26% at 14 weeks. The results are in general agreement with reported residual response from these fertilizers and suggest that the DTPA soil test may be useful for monitoring the availability of micronutrient cations in fertilized as well as unfertilized soils.