Meleta and Abera Greener Journal of Agricultural Sciences Vol. 9(4), pp. 436-446, 2019 ISSN: 2276-7770 Copyright ©2019, the copyright of this article is retained by the author(s) DOI Link: https://doi.org/10.15580/GJAS.2019.4.101419186 https://gjournals.org/GJAS Effects of Rhizobium Inoculation and Phosphorus Fertilizer rates on Nitrogen Fixation and Nutrient up take of Chickpea (Cicer arietinum L.) at Goro, Bale Zone, Oromia Regional State. Tamiru Meleta 1*; Girma Abera 2 1 Sinana Agricultural Research Centre, Bale-Robe, Ethiopia 2 Hawassa University College of Agriculture, Hawassa ARTICLE INFO ABSTRACT Article No.: 101419186 Type: Research DOI: 10.15580/GJAS.2019.4.101419186 Chickpea response to two varieties of chickpea (Arerti and Habr), two Rhizobial inoculants (EAL 018 and EAL 029) and five P rate (0, 15, 30, 45 and 60 kg P2O5 ha-1) were studied in split plot arrangements. Main plot consisted of varieties whereas P2O5 levels and Rhizobium strains were kept in subplot. The experiment was laid out at Goro, Bale Zone, Oromia Regional State during 2015/16 with the objective to determine the effectiveness of Rhizobium strains and phosphorus fertilizer application on two varieties of chickpea (Arerti and Habru).The nodulation rating, nodule volume and color were not significantly affected due to varieties. However, significant variation (P <0.05) was observed in number of nodule per plant (NNPP) and nodule dry weight (NDW) between varieties of chick pea, maximum NNPP and NDW was obtained from Arerti variety. All the nodulation parameters were significantly (P<0.05) affected due to rhizobium inoculation and P2O5 except the nodule color. Maximum nodulation parameters were recorded at 45 and 60 kg P2O5 ha-1and inoculation by EAL 029 strain except the nodule color. Significant interaction effect was observed between variety and Rhizobium inoculation for nodule rate (NR), NDW between variety and P2O5, rhizobium and P2O5 and also interaction effect between varieties, Rhizobium and P2O5 on NR and NDW. The N and P uptake at mid flowering, %Ndfa, grain, straw and total N and P content and crude protein content were significantly affected by variety, rhizobium inoculation and application of P2O5. Maximum response was obtained from EAL 029 strain inoculations and application of 45 kg P2O5 ha-1 for N uptake, seed N and P uptake were maximum at 45and 60 kg P2O5 ha-1 respectively. The current investigation indicated that Arerti variety inoculation with Rhizobium strain EAL 029 along with application of P2O5 at rate of 45 kg ha-1 found to be appropriate for chickpea production in the study area. The current investigation indicated that the use of P2O5 with Rhizobium inoculation as a nutrient management strategy could increase chick pea production. 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Effects of Rhizobium Inoculation and Phosphorus Fertilizer rates on Nitrogen Fixation and Nutrient up take of Chickpea (Cicer arietinum L.) at Goro, Bale Zone, Oromia Regional State. Greener Journal of Agricultural Sciences 9(4): 436-446, https://doi.org/10.15580/GJAS.2019.4.101419186 .