عنوان مقاله [English]
In this study, concentration, absorption and distribution of phosphorus, as most restrictive essential element after nitrogen, in these two stages of wheat and barley were studied.The experimental factors were fertilizer P rate (0, 8.4, 16.8, 25.2 and 33.6 mg P per kg dry soil equal to 0, 20, 40, 60 and 80 kg P ha-1), inoculation or uninoculation with Streptomyces sp. bacterium and crop (wheat cultivar Morvarid and barley cultivar Sahra). In both growth stages of SE and Ant, P concentration was increased linearly in all plant parts by increasing the amount of applied fertilizer phosphorus. In all fertilizer P rates, plant parts in terms of P concentration were arranged as leaf > shoot > total plant > stem > root, and in term of P content were arranged as root< leaf< stem< shoot< total plant. Inoculation with Streptomyces isolate increased root P concentration in SE and leaf, shoot and whole plant P concentration in Ant, P accumulation in these parts of plants and stem in Ant, significantly. In both growth stages, P concentration and accumulation in different parts of plant except phosphorus has accumulated in the stem, in barley was more than wheat. Results showed that P allocation coefficient to different organs has higher stability than P concentration and accumulation. Findings of this study indicated a strong relationship between the amount of accumulated P in whole plant in SE and Ant with grain yield in two crops. This relationship well described by a segmented linear-plateau function.
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