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Universiteit Gent (2010)

Phosphorus speciation and arbuscular mycorrhizal effect on P acquisition in Nitisols

Upadhayay Hari Ram

Titre : Phosphorus speciation and arbuscular mycorrhizal effect on P acquisition in Nitisols

Auteur : Upadhayay Hari Ram

Université de soutenance : Universiteit Gent

Grade : Master of Science (MS) Physical Land Resources 2010

Résumé _ Phosphorus (P) is considered as a primary limiting nutrient for faba bean production in Nitisols of Southwestern Ethiopian highlands. The objectives of this research were to differential P into pools and to evaluate the P uptake and utilization efficiency of two mycorrhizal faba bean cultivars Walki and Salale. Modified Hedley sequential P fractionation showed that sum of all the P fractions (Pt(sum)) ranged from 648 to 1024 mg P kg-1 at 25 and 5 cm depth respectively. For all soil layers (0-10, 10-20 and 20-30 cm depth), largest P fractions were found in slowly available pool (SAP) (57-57%) followed by the less readily available pool (LRAP) (28-37%) and readily available phosphorus (RAP) (5-6%). Multi-factorial (P, biochar, arbuscular mycorrhizae and cultivars) greenhouse experiment showed that P supply was not found significant in P concentration and biomass of the shoot but AMF and biochar showed effect on the P concentration in the shoot but not in the shoot biomass production. Salale had significantly higher colonization percentage (66-77) than Walki (4159). Conversely, Walki had significantly higher (p<0.05) phosphorus utilization efficiency (PUTE) (0.69 g SDW mg-1 P) than Salale (0.46 g SDW mg-1 P). Surprisingly, this research showed that the soil had high bioavailable P. However, Walki could be suitable cultivar compared to Salale in this low-input agroecosystem for sustainable P management but the interaction effects of biochar and/or mycorrhizae on plant performance should be further explored.

Source : Pedon 22 - Physical Land Resources - Universiteit Gent

Page publiée le 1er janvier 2016, mise à jour le 26 mai 2018