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Soil phosphorus balance in Minnesota soils and its effects on soil test phosphorus and soil phosphorus fractions.
- Source :
- Soil Science Society of America Journal; Jul2023, Vol. 87 Issue 4, p918-931, 14p
- Publication Year :
- 2023
-
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. Core ideas: Soil net P balance was positively correlated with changes in STP over four growing seasons.Medium STP interpretation class was maintained in most of these soils with a slight negative soil net P balance.In those same soils, a zero‐soil net P balance would tend to raise STP over time.Soil net P balance is positively related to changes in soil P, mostly in the labile and moderately labile fractions. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHOSPHORUS in soils
SOIL testing
Subjects
Details
- Language :
- English
- ISSN :
- 03615995
- Volume :
- 87
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Soil Science Society of America Journal
- Publication Type :
- Academic Journal
- Accession number :
- 164879809
- Full Text :
- https://doi.org/10.1002/saj2.20549