%0 Journal Article %A Kohandel, asghar %A arzani, hossein %A Tavassol, morteza %T The Effects of Different Grazing Intensities on Nitrogen, Phosphorus, Potassium and Organic Matter in Step Rangelands %J Iranian Jornal of Watershed Management Science&Engineering %V 3 %N 6 %U http://jwmsei.ir/article-1-102-en.html %R %D 2009 %K Nitrogen, Phosphorus, Potassium, Organic Matter and Grazing Intensities., %X The present study has analyzed the effects of different grazing intensities on soil chemical propertiesincluding nitrogen, phosphorus, potassium and organic matter content in different conditions of referencearea, key and critical areas located in Savojbolagh, Iran during 2004-2005. Data produced based on randomizedcomplete block design plot. In this case, study area, time and depth of sampling were appropriatedfor main plots and sub-plots, respectively. Statistical analysis was done using SPSS version 12. If significantdifferences were found between treatments then Duncan test was used for comparison of means.According to the results, there were significant differences between NPK rates during two years. The rateof organic matter, nitrogen and phosphorus was increased in second year and the amount of potassium wasdecreased. Animal grazing significantly affected soil chemical characteristics in all areas (reference, keyand critical). There were significant differences between content of nitrogen, phosphorus, and potassiumin two years, during the grazing season and between the two depths. %> http://jwmsei.ir/article-1-102-en.pdf %P 59-65 %& 59 %! %9 Research %L A-10-1-46 %+ Jihad University of Tehran %G eng %@ 2008-9554 %[ 2009