Effects of the returning organic wastes on soil enzymes and microbial quantity in dryland farming

Long term productivity and conservation of soils is critical for sustaining agricultural ecosystems. The specific objective of the work reported was to determine the effects of long term application of organic and mineral fertilizers on soil enzyme activity as an index of soil biology and biochemistry. Three key soil enzymes involved in intracellular metabolism of microorganisms and two soil enzymes involved in phosphorus metabolism were selected. Actual and potential dehydrogenase, catalase, acid and alkaline phosphatase activities were determined in the 0-20 cm layer of an eroded soil submitted to a complex fertilization experiment. Results showed that addition of mineral fertilizers to organic (green manure and farmyard manure) fertilizers led to a significant increase in each activity because of increased plant biomass production which upon incorporation stimulates soil biological activity. The enzymatic indicators of soil quality calculated from the values of enzymatic activities depending on the kind of fertilizers showed that by the determination of enzymatic activities valuable information can be obtained regarding fertility status of soils. A weak positive correlation between enzymatic indicators of soil quality and maize yield was established. The yield data demonstrate the superiority of farmyard manure which provided greater stability in crop production. Substantial improvement in soil biological activity due to application of organic fertilizers with mineral fertilizers contribute in maintaining the productivity and soil health.

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Impacts of Organic Wastes on Plankton Population of Woji Creek, Port Harcourt, Rivers State, Nigeria

AMBIENT SCIENCE ◽

10.21276/ambi.2018.05.1.ra03 ◽

2018 ◽

Vol 5 (01-02 & Sp1) ◽

Author(s):

Utibe I. Daniel ◽

◽

Christiana C. Duru ◽

Obemeata Oriakpono ◽

M.O.E. Iwuala

Keyword(s):

Organic Wastes ◽

Port Harcourt ◽

Rivers State ◽

Plankton Population

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Nitrogen in Organic Wastes Applied to Soils

Journal of Environmental Quality ◽

10.2134/jeq1990.00472425001900030048x ◽

1990 ◽

Vol 19 (3) ◽

pp. 631-631

Author(s):

C. Grant Kowalenko

Keyword(s):

Organic Wastes

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Influence of Organic Wastes on Evaporation and Hydraulic Properties of Sandy Soil

Alexandria Science Exchange Journal An International Quarterly Journal of Science Agricultural Environments ◽

10.21608/asejaiqjsae.2017.2453 ◽

2017 ◽

Vol 38 (January-March) ◽

pp. 120-136

Keyword(s):

Sandy Soil ◽

Hydraulic Properties ◽

Organic Wastes

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Anaerobic co-digestion of three organic wastes under mesophilic conditions: lab-scale and pilot-scale studies

Environment Development and Sustainability ◽

10.1007/s10668-020-01009-0 ◽

2020 ◽

Author(s):

Lamis Yousra Shahrazed Khelifa Zouaghi ◽

Hayet Djelal ◽

Zineb Salem

Keyword(s):

Pilot Scale ◽

Organic Wastes ◽

Mesophilic Conditions

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Effects of long-term (42 years) tillage sequence on soil chemical characteristics in a dryland farming system

Soil and Tillage Research ◽

10.1016/j.still.2021.105064 ◽

2021 ◽

Vol 212 ◽

pp. 105064

Author(s):

Flackson Tshuma ◽

Francis Rayns ◽

Johan Labuschagne ◽

James Bennett ◽

Pieter Andreas Swanepoel

Keyword(s):

Farming System ◽

Chemical Characteristics ◽

Dryland Farming

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Co-Management of Sewage Sludge and Other Organic Wastes: A Scandinavian Case Study

Energies ◽

10.3390/en14123411 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3411

Author(s):

Clara Fernando-Foncillas ◽

Maria M. Estevez ◽

Hinrich Uellendahl ◽

Cristiano Varrone

Keyword(s):

Anaerobic Digestion ◽

Sewage Sludge ◽

Resource Recovery ◽

Organic Wastes ◽

Industrial Wastes ◽

Wastewater Management ◽

Sewage Sludge Management ◽

The Common ◽

Green Chemicals

Wastewater and sewage sludge contain organic matter that can be valorized through conversion into energy and/or green chemicals. Moreover, resource recovery from these wastes has become the new focus of wastewater management, to develop more sustainable processes in a circular economy approach. The aim of this review was to analyze current sewage sludge management systems in Scandinavia with respect to resource recovery, in combination with other organic wastes. As anaerobic digestion (AD) was found to be the common sludge treatment approach in Scandinavia, different available organic municipal and industrial wastes were identified and compared, to evaluate the potential for expanding the resource recovery by anaerobic co-digestion. Additionally, a full-scale case study of co-digestion, as strategy for optimization of the anaerobic digestion treatment, was presented for each country, together with advanced biorefinery approaches to wastewater treatment and resource recovery.

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