Abstract In the area where the high quality water is not available, unconventional water sources are used to irrigate. Household leachate is one of the sources which are used in dry and semi dry areas in order to water the barer trees and plants. It meets the plants needs and also has some effects on the soil, but at the same time it might cause some problems as well. This study in order to evaluate the effect of using Compost leachate on the density of soil iron in form of a statistical pattern called ''Split Plot'' by using two main treatments, one subsidiary treatment and three repetitions of the pattern in a three month period. The main N treatments include: irrigation using well water as a blank treatments and the main I treatments include: irrigation using leachate and well water concurrently. Some subsidiary treatments were DI (Drop Irrigation) and SDI (Sub Drop Irrigation). Then in the established plots, 36 biannual pine and cypress shrubs were randomly grown. Two months later the treatment begins. The results revealed that there was a significant variation between the main treatment and the instance regarding pH decline in the soil which was related to the amount of leachate injected into the soil. After some time and using leachate the pH level fell, as much as 0.46 and also increased due to the great amounts of leachate. The underneath drop irrigation ends in better results than sub drop irrigation since it keeps the soil texture fixed. Keywords Compost Leachate, Drop irrigation, Soil Reaction I. INTRODUCTION HE developments of the cities and wrong consumption patterns have caused an increase in the ooze and sewage. The Leachate found in them is so high due to the dampness in the households. Leachate includes some floating organic substances, nutrients, and solid metals. These metals cause soil pollution and are a threat to the environment [1].Using sewage as a water resource in farming is very widespread and it started long time ago since it contains the substances essential for the plants [2], [3]. Studies in Shiraz show that an unsystematic and uncontrolled use of ooze would increase the solid metals density in the soil over a long time [3]. The studies revealed that using ooze over a long time would increase the amount of Cadmium and other solid metals in the soil which increase the plant's intake and consequently cause such poisonous metals to enter the humans' food chain [4]. In underneath watering in the depth range of 15 20 cm the evaporation seems insignificant compared to the surface system. The wet surface would increase after the watering and it would increase as the time [5]. Ali Gholami is with Department of Soil Science, Science and Research Branch, Islamic Azad University, khouzestan, Iran(phone: 0098-611- 4457612; fax: 0098-611-4435288; *corresponding author e-mail: (a.gholami@khouzestan.srbiau.ac.ir) Shahram Ahmadi is with Department of Soil Science, Science and Research Branch, Islamic Azad University, khouzestan, Iran(phone: 0098- 916-611-5587; fax: 0098-611-4435288;e-mail:( sh.ahmadi1@gmail.com) II.MATERIALS AND METHODS A. Study area The present study is conducted in east Isfahan. The height from the sea level was 1555 meters, the average rainfall 120 ml, and the average annual temperature 16 Celsius. The soil is of Golshahr type and belonged to Aridisols class. The soil texture in the selected region is Loamy, and based on Aiers Wescat guidelines for evaluating the water quality, the water amount is considered to be average [6]. Fig. 1 Position of study area in Isfahan province and Iran B. Methods Number First a suitable areas was selected for Pilot Performance and the research conducted using Factorial Split plat including two major treatments, and two subsidiary ones in a three month period and was repeated three times. The treatments include; N; irrigating using well water as an instance, I; irrigating using leachate and well water, DI (Drop Irrigation), and SDI (Sub Drop Irrigation) as an underneath drop irrigation. Before that, two types of trees; cypress and pine two year old shrubs were planted. About 200 liters of leachate was transferred to a 1000 liters tank and was diluted by the well water after that the EC reached 4 ds/m. This leachate was the main one used in the treatments. The average output from the dropping tube was 10 liters per hour and the irrigation was performed every two days. In each round about 20 liters of leachate was injected to the tree. So the amount of the consumed leachate for the rotation treatment (I) was 150 liters per month. The irrigation period lasted 2 hours and it was 0.17 liter per minute. C. The Analysis Procedures: - Soil Reaction The Soil Reaction (acidity) of the soil samples in the extract was calculated by a pH device to be 632 Metrohm [7]. - Data Analysis The study was done in a form of Factorial Split plat design. the results were calculated using MSTATC software. Duncan test was applied to determine if the changes were meaningful and Excel software was used to draw the diagrams. Ali Gholami, Shahram Ahmadi The Influence of using Compost Leachate on Soil Reaction T World Academy of Science, Engineering and Technology 61 2012 1276