Change in three dry rangeland species growth and soil properties by compost application

There are different types of compost used as soil conditioners and fertilizers. Plants can have different responses to differentforms of compost. This field study was performed to examine the effects of different types of compost on growthfactors of three dry rangeland species (Atriplex, Atriplex lentiformis; Saltwort, Seidlitzia rosmarinus; Haloxylon, Haloxylonpersicum) and soil properties. The experiment was conducted in the Fars Province of Iran during the year 2010-2011.Compost applications consisted of compost tea, solid compost (SC), solid and liquid mixture (MX) and no compost asthe control. The study was a factorial experiment based on a randomized complete block design with 3 replications. Theresults showed that all the tested compost applications enhanced the growth traits of all three species. It was also demonstratedthat the use of compost significantly increased the organic matter (1% probability level [PL]), nitrogen concentration(5% PL), phosphorous (5% PL) and potassium (5% PL) concentrations of the soil. The soil’s pH level was unchanged(range, 7.3 to 7.6), and the sodium concentration was also significantly decreased (1% PL) by the use of compost. Thehigher responses were observed in canopy volume and soil sodium and the lower were observed in stem diameter andsoil pH level. Among the three plants in the study, Atriplex showed the best response to the application of compost. Basedon the results of this study, it can be recommended that the best compost application to increase growth and improve soilcondition is the mixed compost (MX) for Atriplex and the SC for Saltwort and Haloxylon.