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Long-Term Biosolids Applications to Overgrazed Rangelands Improve Soil Health
Buchanan, Cassidy M. ; Ippolito, James A.
Agronomy (Basel), 2021-07, Vol.11 (7), p.1339
[Periódico revisado por pares]
Basel: MDPI AG
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Título:
Long-Term Biosolids Applications to Overgrazed Rangelands Improve Soil Health
Autor:
Buchanan, Cassidy M.
;
Ippolito, James A.
Assuntos:
Aridity
;
Biodiversity
;
Biomass
;
Biosolids
;
Environmental degradation
;
Grasslands
;
Land application
;
Long-term effects
;
Moisture content
;
Nutrients
;
overgrazed rangelands
;
Plant communities
;
Rangelands
;
Sludge
;
Soil chemistry
;
Soil degradation
;
soil health
;
Soil improvement
;
Soil management
;
Soil Management Assessment Framework
;
Soil properties
;
Soils
É parte de:
Agronomy (Basel), 2021-07, Vol.11 (7), p.1339
Descrição:
Overgrazed rangelands can lead to soil degradation, yet long-term land application of organic amendments (i.e., biosolids) may play a pivotal role in improving degraded rangelands in terms of soil health. However, the long-term effects on soil health properties in response to single or repeated, low to excessive biosolids applications, on semi-arid, overgrazed grasslands have not been quantified. Using the Soil Management Assessment Framework (SMAF), soil physical, biological, chemical, nutrient, and overall soil health indices between biosolids applications (0, 2.5, 5, 10, 21, or 30 Mg ha−1) and application time (single: 1991, repeated: 2002) were determined. Results showed no significant changes in soil physical and nutrient health indices. However, the chemical soil health index was greater when biosolids were applied at rates <30 Mg ha−1 and within the single compared to repeated applications. The biological soil health index was positively affected by increasing biosolids application rates, was overall greater in the repeated as compared to the single application, and was maximized at 30 Mg ha−1. The overall soil health index was maximized at rates <30 Mg ha−1. When all indices were combined, and considering past plant community findings at this site, overall soil health appeared optimized at a biosolids application rate of ~10 Mg ha−1. The use of soil health tools can help determine a targeted organic amendment application rate to overgrazed rangelands so the material provides maximum benefits to soils, plants, animals, and the environment.
Editor:
Basel: MDPI AG
Idioma:
Inglês
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