Effects of Natural Zeolite Application under FoliarSpraying with Humic Acid on Yield and YieldComponents of Cucumber (Cucumis sativus L.)Hamid Reza Bozorgi 1 , Sirous Bidarigh 2 , Ebrahim Azarpour 1 , Reza KhosraviDanesh 2 and Maral moraditochaee 11. Young Researchers Club, Lahijan Branch, Islamic Azad University, Lahijan, Iran2. Department of Agriculture, Lahijan Branch, Islamic Azad University, Lahijan, IranCorresponding author email: Hamid Reza Bozorgi: email@example.comABSTRACT: In order to study effects of zeolite application and foliar spraying of humic acid on yieldand yield components of cucumber (Cucumis sativus L.), an experiment during farming year 2011, inLahijan township (north of Iran), was conducted. The experiment was conducted in factorial formatbased on randomized complete block design with three replications. Factors of experiment wereconsisting of zeolite application with three levels (Z 1 : control (without zeolite application), Z 2 : 4 andZ 3 : 8 ton/ha) and humic acid foliar spraying with three levels (H 1 : control (without foliar spraying withhumic acid), H 2 : 30, H 3 : 60 mg/liter). Measured traits were include fruit yield, number of fruits perplant, fruit length and plant height. Results of experiment showed that the effect of zeolite applicationand also humic acid foliar spraying on all traits was significant at 1% probability level. But interactioneffect only showed significant differences on fruit yield at 1% probability level. Among zeoliteapplication levels, 8 ton/ha zeolite application and between humic acid foliar spraying levels, 60mg/liter spraying were superior.Keywords: Cucumber. Zeolite. Humic acid. Yield. IranINTRODUCTIONCucumber (Cucumis sativus L.) is an important vegetable and one of the most popular members of theCucurbitaceae family (Lower and Edwards, 1986; Thoa, 1998). It is thought to be one of the oldest vegetablescultivated by man with historical records dating back 5,000 years (Wehner and Guner, 2004). The crop is thefourth most important vegetable after tomato, cabbage and onion in Asia (Tatlioglu, 1997), the second mostimportant vegetable crop after tomato in Western Europe (Phu, 1997).Zeolite minerals are hydrated aluminosilicates of alkali or alkaline-earth metals, structured in a threedimensional rigid crystalline network, formed by tetrahedral AlO 4 and SiO 4 , whose rings join in a system ofcanals, cavities and pores. These minerals are characterized by the ease of retaining and releasing water andexchanging cations without structural changes (Mumpton and magica, 1999; Kithome et al., 1999) and canpotentially be used in field or substrate cultivation (Harland et al., 1999). There are over 40 species of naturalzeolites, of which clinoptilolite is apparently the most abundant, both in soils and in sediments (Ming et al.,1987).