Premium
Changes in the Rhizosphere Due to NH 4 + and NO 3 ‐ Fertilization and Phosphorus Uptake by Corn Seedlings (Zea mays L.)
Author(s) -
Soon Y. K.,
Miller M. H.
Publication year - 1977
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/sssaj1977.03615995004100010024x
Subject(s) - monocalcium phosphate , zea mays , chemistry , phosphorus , human fertilization , phosphate , rhizosphere , absorption (acoustics) , soil water , agronomy , zoology , biology , ecology , genetics , organic chemistry , fishery , fish <actinopterygii> , bacteria , fish meal , physics , acoustics
Corn ( Zea mays L.) seedlings were grown for 11 days on 3 soils of pH 7.1, 5.5, and 4.3, and fertilized with monocalcium phosphate, and either (NH 4 ) 2 SO 4 , Ca(NO 3 ) 2 , or CaCl 2 . Rhizocylinder (roots plus adhering soil) and bulk soil solutions were isolated by centrifugal filtration and analyzed for pH and phosphate. The pH of the rhizocylinder solution was lowered by the absorption of NH 4 + and increased slightly by NO 3 ‐ absorption. Reduced rhizocylinder pH was associated with increased rhizocylinder solution phosphate concentration and P uptake by corn seedlings. The difference in P absorption between NH 4 + ‐fertilized and NO 3 ‐ ‐fertilized corn can be explained by induced changes in the H 2 PO 4 ‐concentration associated with rhizocylinder pH. But, in addition, NH 4 + and NO 3 ‐ enhanced P absorption probably as a result of increased physiological capacity to absorb P and/or increased root growth.