Influence of Manuring on certain soil physical properties in the middle awash area of ethiopia

Girma, Tsegaye; Endale, B.

doi:10.1080/00103629509369391

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The particle density also decreased significantly from 2.53 (control) to 2.20, 2.20, 1.97 g/cm 3 in the third year. These results are in agreement with other studies, such as by Girma & Endale (1995).…”

Section: Resultssupporting

confidence: 94%

Transport of zinc, copper, and lead in a sewage sludge amended calcareous soil

Yeganeh

Afyuni

Khoshgoftarmanesh

et al. 2010

Soil Use and Management

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The application of sewage sludge on farmland is practised in many countries since sludge is rich in macro‐ and micro‐ nutrients. However, increasing use of sewage sludge on farmland has raised concerns about the potential transport of heavy metals into food chains and groundwater. This study determined for a calcareous soil the effects of sludge application on soil physical properties and transport of zinc (Zn), copper (Cu), and lead (Pb). Secondary anaerobic digested sewage sludge was applied at rates of 0, 25, 50, and 100 t/ha (on a dried weight basis) for four consecutive years and mixed in the top 20‐cm of soil. Corn (Zea mays L.) was planted as a spring crop, followed by wheat (Triticum aestivum) as a winter crop. Sludge application increased the dissolved organic matter content and modified the soil structure, increased the soil infiltration rate, saturated hydraulic conductivity, and aggregate stability, and decreased the bulk density. Sludge application greatly increased DTPA (diethylenetriamine pentaacetic acid)‐extractable soil metal concentrations to 50 cm depth and significantly to 1 m. In the plots that received four application of 100 t/ha sewage sludge, the mean concentrations of Zn, Cu, and Pb in subsoil increased by 1600, 7, and 4.5 times, respectively, compared with the control. The results indicate that a combination of enhanced soil physical properties, heavy and inefficient irrigation and high organic matter content with heavy metals cause significant metal mobility. High sludge applications pose risks of groundwater and food chain contamination and rates are best restricted to those reflecting the nutrient demand of crops (20 t/ha every 4 to 5 yr or an average of 4 to 5 t/ha/yr).

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Section: Resultssupporting

confidence: 94%

Transport of zinc, copper, and lead in a sewage sludge amended calcareous soil

Yeganeh

Afyuni

Khoshgoftarmanesh

et al. 2010

Soil Use and Management

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“…Related studies have shown that long-term crop straw incorporation practices positively affect the bulk density and total porosity of the soil (Girma and Endale, 1995;Pagliai et al, 2004). Barzegar et al (2002) and Wei et al (2006) reported that higher rates of organic material addition resulted in lower bulk densities.…”

Section: Discussionmentioning

confidence: 97%

Effects of straw incorporation on the stratification of the soil organic C, total N and C:N ratio in a semiarid region of China

Zhang

Wei

et al. 2015

Soil and Tillage Research

121

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“…Reductions in b can be attributed to an increase in organic matter content as a result of the manure applications. There is evidence showing that adding organic materials to soil reduces b (Martens and Frankenberger, 1992;Jordahl and Karlen, 1993;Girma and Endale, 1995;Obi and Ebo, 1995). Inexplicably, b seems to increase with manure applications at the 30-to 37.6-cm depth.…”

Section: Bulk Densitymentioning

confidence: 91%