American Journal of Environmental Protection
ISSN (Print): 2328-7241 ISSN (Online): 2328-7233 Website: http://www.sciepub.com/journal/env Editor-in-chief: Mohsen Saeedi, Hyo Choi
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American Journal of Environmental Protection. 2015, 3(3), 100-105
DOI: 10.12691/env-3-3-6
Open AccessArticle

Long-term Effect of Mixed Wastewater Irrigation on Soil Properties, Fruit Quality and Heavy Metal Contamination of Citrus

Hoda A. A. Galal1,

1Environmental Studies and Research Institute (ESRI), Univ of Sadat City (USC), Sadat City, sixth zone, Egypt

Pub. Date: May 15, 2015

Cite this paper:
Hoda A. A. Galal. Long-term Effect of Mixed Wastewater Irrigation on Soil Properties, Fruit Quality and Heavy Metal Contamination of Citrus. American Journal of Environmental Protection. 2015; 3(3):100-105. doi: 10.12691/env-3-3-6

Abstract

Wastewater contains essential elements for plant growth as well as heavy metals which may be toxic for plant and human. In the northern regions of the Nile Delta, mixed water (wastewater mixed with fresh water) is used in land irrigation long time ago. The present study was conducted to assess the impact of long-term irrigation with mixed water (MW); compared to Nile fresh water (FW), on “Navel” orange [Citrus sinensis (L.) Osbeck] orchards (aged 10 to 12 years). Some soil properties, yield, fruit quality and heavy metals contamination were evaluated in three orchards irrigated with mixed water and compared with another three orchards irrigated with Nile water. The Results indicated that long term application of MW induced significant (p<0.05) increase of soil pH and Ec, particularly in the surface layer. In comparison with FW irrigated soil, mixed water resulted in accumulation of K, Fe, Mn, Cu, Zn, Ni and Na in the soil. On the other hand, MW irrigation increased yield parameters (fruit weight and yield/tree), soluble solids content and Brix/acid ratio. Fruit is still looking apparently healthy despite increasing of K, Fe, Mn, Zn, Ni and Na in its peel and pulp. It can be concluded that MW irrigation may be useful in the reduction of fertilizers applied to orchards. Whereas, there is a potential risks associated with crops consumption that irrigated for a long-term with mixed water. Therefore, we have to be careful about mixed water irrigation and use it under controlled conditions to protect soil properties and minimize hazards from heavy metal accumulation in agricultural products and the food chain.

Keywords:
mixed water irrigation heavy metals soil peel pulp orange

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