Iqta and the change of agricultural production relations in the Iran's middle Ages

With the commencement of limited giving state (divani) lands to the militaries as an iqta in the Buyid period and spread and Stabilize of this in the Seljuk period, Made a major changes in the land economy’s structure of Iran’s plateau which remained almost unchanged from arrival of the Islam in Iran until the Seljuk domination. The main problem of this article is to investigate the effects of iqta expansion on the structure of Iran’s land economy and its usual production relations. Also in this article, with the analytical-historical method and using the comparative comparison technique, I have studied the prosperity of agricultural production and the production relations related to it between iqta regions and other areas. I have also compared conditions of the land economy before and after the expansion of this land using system and it have been shown that the expansion of the iqta has caused damage to Iran’s agricultural economy, both in terms of  the growth of  productive forces and changing the most type mode of production relations in the Iran’s plateau land economy from "fixed ownership portion" To the " MOZARIE "and how it led to the more Exploitation of direct productive forces and separation them from the tools of production and the appropriate share of the product. Moreover, the causes of this downward trend in Iran's agricultural economy and the adverse consequences of these changes in production relations after the expansion ofiqta are discussed.