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Phosphorus Mobility in Heavily Manured and Waterlogged Soil Cultivated with Ryegrass (Lolium multiflorum).
- Source :
- Agronomy; Aug2023, Vol. 13 Issue 8, p2168, 19p
- Publication Year :
- 2023
-
Abstract
- Extended waterlogging (WL) conditions in heavily manured soils can change soil phosphorus (P) dynamics. We assessed the effects of soil moisture regimes (field capacity (FC) and WL) and P rates on (i) dry matter (DM) yield and P offtake of ryegrass, (ii) changes in soil Fe<superscript>3+</superscript>, Fe<superscript>2+</superscript>, and soil P, and (iii) risk of P leaching. The treatments were tested in a four-month greenhouse experiment using intact soil columns and annual ryegrass (Lolium multiflorum). The DM yield and P offtake were lower under WL compared with FC. The concentration of Fe<superscript>3+</superscript> was 1984 mg kg<superscript>−1</superscript> (0–30 cm) under FC, but 1213 mg kg<superscript>−1</superscript> at 0–5 cm and 2024 mg kg<superscript>−1</superscript> at 25–30 cm depth under WL. The concentration of Fe<superscript>2+</superscript> was 244 mg kg<superscript>−1</superscript> (0–30 cm) under FC, but 2897 at 0–5 cm and 687 mg kg<superscript>−1</superscript> at 25–30 cm under WL. The water extractable P (Pw) was 12.7 mg kg<superscript>−1</superscript> at 0–5 cm and 9.5 mg kg<superscript>−1</superscript> at 25–30 cm under FC, but 8.6 mg kg<superscript>−1</superscript> at 0–5 cm and 10.5 mg kg<superscript>−1</superscript> at 25–30 cm under WL. The P saturation index (PSI) was 27.2% at 0–5 cm and 17.4% at 25–30 cm under FC, but averaged 11.9% at 0–30 cm under WL. We can conclude that extended WL associated with flooding creates reducing conditions in the soil, thus decreasing the concentration of Fe<superscript>3+</superscript>, but increasing the concentrations of Fe<superscript>2+</superscript> and the solubility of P which can exacerbate the risk of P loss with runoff and leaching. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734395
- Volume :
- 13
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Agronomy
- Publication Type :
- Academic Journal
- Accession number :
- 170709836
- Full Text :
- https://doi.org/10.3390/agronomy13082168