Potassium Concentration and Partitioning in Important Growh Stages of Wheat and Barley Influenced by Phosphorus Fertilizer and Streptomyces

Findings on mineral nutrient concentration, accumulation and allocation in different parts of crop can help to more accurate planning in order to optimize the mineral nutrition of Plant. Therefore, the present study aims to investigate the effect of phosphorus fertilizer rates (Prate) as 0. 8.4, 16.8, 25.2 and 33.6 mg phosphorous (P) per Kg of dry soil equal to 0, 20, 40, 60 and 80 Kg P.ha-1 and inoculation with P solubilizing bacteria Streptomyces sp. on concentration, accumilation and partitioning of potassium (K) in different parts of wheat and barley in stem elongation (SE), anthesis(Ant) and harvest maturity(HM). This pot experiment was conducted as a factorial experiment in a completely randomized design with four replications in the new campus of Gorgan University of Agricaltural Sciences and Natural Resources during 2014-2015 growing season. Results showed that K concentration ([K]) were significantly influenced by Prate in all plant parts and was increased linearly by increasing the Prate in all three above mentioned growth stages. Also, Inoculation with bacteria increased shoot and total plant [K] in SE and Anth Stage, significantly. There was a significant difference between the two crops for the above traits. The results indicate that increase in Prate and inoculation with bacteria resulted in a significant increase in K accumulation (KCont) in all plant parts, and that two studied crops were statistically different in terms of the leaf and grain Kcont. Also, results showed a significant effect of inoculation with bacteria on Kcont of shoot and total plant in SE, all plant parts in Anth, and all shoot organs in HM. The Kcont in shoot and total plant in SE, all plant parts except stem in Anth, and all shoot organs in HM of wheat was different with barley, statistically. Also, based on the results of this study, the potassium partitioning coefficient to different plant parts in all three stages was more stable compared to [K] and Kcont, and it was much less affected by experimental factors. Finally, there was not significant interaction between the experimental factors almost for all above mentioned traits.