EFFECT OF IRRIGATION WITH TREATED WASTE WATER ON SOIL PHYSICAL, CHEMICAL AND BIOLOGICAL PROPERTIES

Mohammed Sadick Al-Jader, Bothyna; Hassan Sabri Bahia, Mohammed

	EFFECT OF IRRIGATION WITH TREATED WASTE WATER ON SOIL PHYSICAL, CHEMICAL AND BIOLOGICAL PROPERTIES
The Iraqi Journal of Agricultural Science
Article 1, Volume 39, Issue 6, 2008, Pages 21-33
Authors
Bothyna Mohammed Sadick Al-Jader; Mohammed Hassan Sabri Bahia
Abstract
This experiment was conducted on silty clay soil from agricultural field in Mahmoudiyah – Baghdad to investigate the effect of treated waste water on soil properties. Factorial experiment was applied in a completely randomized design by three replications and three factors. There were two types of water (waste water & Euphrates water), four levels of addition (0, 10, 20 & 30%) and four durations of incubation (0, 20, 40 & 80 days). Results showed a positive significant impact of waste water in the physical properties of the soil. This impact caused greater increase in the mean weight diameter of soil (1.01 & 0.74 mm), decrease in the bulk density (49 & 9%) and an increase in the total porosity (66 & 12%) for both waste water and river water, respectively. Impact of waste water in the chemical properties was significant throughout increasing cation exchange capacity (41.56 & 27.57 Cmol. Kg -1), and increasing electrical conductivity (4.48 & 3.53 dS.m-1) for both waste water and river, respectively. Also, results showed significant impact of waste water in the biological properties, such as increasing of total nitrogen (4.51 g. kg -1 ) compared with river water (2.50 g. kg -1 ) and increasing available phosphorus for waste water (36.72 mg. kg - 1) and river water (9.53 mg. kg -1 ). A part of biological impact can be related to decrease growth of bacteria with waste water and increase in the growth of fungi, thereby reducing the demand of biological oxygen for the microbiological activity in the decomposition of organic waste.

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