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אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Physicochemical mechanisms underlying soil and organic amendment effects on runoff P losses
Year:
2020
Source of publication :
Land Degradation and Development
Authors :
בר-יוסף, בניהו
;
.
זילבר, אבנר
;
.
לבקוביץ', אירית
;
.
לוי, גיא
;
.
ממדוב, אמרח
;
.
פיין, פנחס
;
.
Volume :
Co-Authors:
Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Phosphorus depletion from cultivated lands by runoff is a significant contributor to soil chemical degradation. Our objective was to elucidate the mechanisms through which soil and organic matter amendments affect rain‐induced runoff P losses in Mediterranean soils. Clay, loam, and loamy sand mixed with noncomposted activated sludge (AS), manure compost (MC), industrial humic acid (HA), orthophosphate (Pi), or inositol hexaphosphate (IHP) were subjected to six consecutive artificial rainstorms. Adding amendments significantly increased runoff available Pi loss (the sum of solution and sediments bicarbonate extractable Pi) for all soils. The order of loss (Pi, mg m−2) was soil dependent; greatest and lowest in the loam and loamy sand, respectively (loam: Pi[270] > IHP[128] > AS[108] > MC[97] > HA[49] > Control[33], and loamy sand: AS[42] > HA[23] > Pi[22] > IHP[18] > MC[13] > Control[4]), although order of runoff and soil loss were clay > loam > loamy sand. Treating with IHP and Pi at a similar total P level led to comparable cumulative total‐P runoff losses, but runoff available Pi loss was much greater in the Pi treatment of soils with higher clay content (clay > loam > loamy sand). A derived isotherm relating sediment Olsen Pi to dissolved reactive Pi (DRP) concentration in runoff was found useful for estimating runoff Pi losses from measured DRP, runoff volume, and sediment concentration. The results could be explained by the impact of the amendments on soil structure stability, sealing, runoff, and erosion levels associated with soil physical and chemical degradation.

Note:
Related Files :
arid and semi‐arid regions
bicarbonate soluble P.
Humic acid
Langmuir
P adsorption
pH
Runoff P losses
Runoff sediment
soil texture
עוד תגיות
תוכן קשור
More details
DOI :
10.1002/ldr.3607
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
47469
Last updated date:
02/03/2022 17:27
Creation date:
06/05/2020 00:15
Scientific Publication
Physicochemical mechanisms underlying soil and organic amendment effects on runoff P losses
Physicochemical mechanisms underlying soil and organic amendment effects on runoff P losses

Phosphorus depletion from cultivated lands by runoff is a significant contributor to soil chemical degradation. Our objective was to elucidate the mechanisms through which soil and organic matter amendments affect rain‐induced runoff P losses in Mediterranean soils. Clay, loam, and loamy sand mixed with noncomposted activated sludge (AS), manure compost (MC), industrial humic acid (HA), orthophosphate (Pi), or inositol hexaphosphate (IHP) were subjected to six consecutive artificial rainstorms. Adding amendments significantly increased runoff available Pi loss (the sum of solution and sediments bicarbonate extractable Pi) for all soils. The order of loss (Pi, mg m−2) was soil dependent; greatest and lowest in the loam and loamy sand, respectively (loam: Pi[270] > IHP[128] > AS[108] > MC[97] > HA[49] > Control[33], and loamy sand: AS[42] > HA[23] > Pi[22] > IHP[18] > MC[13] > Control[4]), although order of runoff and soil loss were clay > loam > loamy sand. Treating with IHP and Pi at a similar total P level led to comparable cumulative total‐P runoff losses, but runoff available Pi loss was much greater in the Pi treatment of soils with higher clay content (clay > loam > loamy sand). A derived isotherm relating sediment Olsen Pi to dissolved reactive Pi (DRP) concentration in runoff was found useful for estimating runoff Pi losses from measured DRP, runoff volume, and sediment concentration. The results could be explained by the impact of the amendments on soil structure stability, sealing, runoff, and erosion levels associated with soil physical and chemical degradation.

Scientific Publication
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