Soil phosphorus balance in Minnesota soils and its effects on soil test phosphorus and soil phosphorus fractions

Albert L. Sims, Karina P. Fabrizzi, Daniel Kaiser, Carl J Rosen, Jeffrey A Vetsch, Jeffrey S. Strock, John A. Lamb, Bhupinder S. Farmaha

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Phosphorus (P) fertilizer recommendations based on the build and maintain (B&M) or the sufficiency philosophies were compared at six sites across Minnesota. Various levels of soil test P (STP) levels were established over four growing seasons. Applied P and P removed in harvested grain were monitored and used to develop a soil net P balance (Net P). Linear regression of net P with changes in STP was highly significant. Initial STP levels could be maintained at four of the six sites with a negative Net P. At those same sites, a zero Net P would tend to slowly increase STP over time. A sequential soil P fractionation analysis was conducted on soils from the six sites at the initiation and at the end of the 4-year period. Nine total soil P fractions were extracted that represented both inorganic P (Pi) and organic P (Po) in the labile and non or less labile soil P pools. A positive linear relationship between Net P and changes in Pi fractions was significant. As Net P increased, so did the changes in Pi in the Resin, BiCarb, and NaOH fractions. These three fractions accounted for 66% to >100% of the changes in Net P with Resin and NaOH accounting for the majority of Net P. Changes in Net P that were accounted for in the less labile P pools, Sonic and HCl fractions, variable, and difficult to determine. There was little effect of Net P on Po fractions.

Original languageEnglish (US)
Pages (from-to)918-931
Number of pages14
JournalSoil Science Society of America Journal
Volume87
Issue number4
DOIs
StatePublished - Jul 1 2023

Bibliographical note

Funding Information:
Partial funding for this research provided by the Agricultural Fertilizer Research and Education Council through Minnesota Department of Agriculture. The authors wish to also recognize the valuable assistance on this project of the many support staff at the various locations including Kim Hoff, Jeff Nielsen, Mark Coulter, Matt McNearney, David Groh, Kyle Holling, and the Department of Soil, Water, and Climate Field Crew.

Funding Information:
Partial funding for this research provided by the Agricultural Fertilizer Research and Education Council through Minnesota Department of Agriculture. The authors wish to also recognize the valuable assistance on this project of the many support staff at the various locations including Kim Hoff, Jeff Nielsen, Mark Coulter, Matt McNearney, David Groh, Kyle Holling, and the Department of Soil, Water, and Climate Field Crew.

Publisher Copyright:
© 2023 The Authors. Soil Science Society of America Journal © 2023 Soil Science Society of America.

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