HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Giordano, P. M. Articles by Mortvedt, J. J. Search for Related Content PubMed Articles by Giordano, P. M. Articles by Mortvedt, J. J. Agricola Articles by Giordano, P. M. Articles by Mortvedt, J. J.

Phosphorus Availability to Corn as Affected by Granulating Manganese with Ortho- and Pyrophosphate Fertilizers¹

ABSTRACT

The presence of MnSO₄ at a level of 10% Mn in granular ammonium polyphosphate (APP) and triammonium pyrophosphate (TPP) significantly reduced corn (Zea mays L.) forage yields and P uptake relative to treatments where P and Mn were applied separately in greenhouse pots. A significant reduction in P uptake resulted when MnSO₄ was combined with monoammonium phosphate (MAP), but no yield reduction occurred.

Chemical extraction of the fertilizers indicated that the solubilities of both P and Mn were reduced when MnSO₄ was granulated with APP or TPP. A compound of very low solubility, Mn(NH₄)₂P₂O₇ · 2H₂O, was identified as the principal reaction product. Accordingly, movement of P in soil was restricted to a greater extent when MnSO₄ was combined with TPP than with MAP.

Contribution of the Soils and Fertilizer Research Branch. National Fertilizer Development Center, TVA, Muscle Shoals. Ala. Presented in part at the Western Soil Science Society Meetings, June 25, 1968, at Logan, Utah.

² Soil Chemists.

Received for publication September 25, 1968. Accepted for publication January 16, 1969.