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2022 Speakers

Efficiency in utilization of phosphorus for symbiotic nitrogen fixation affects the phosphorus bio-availability in organic-horticulture soils of Herault valley

Hesham Aslan Attar

Hesham Aslan Attar, Speaker at Plant Biology Congress 2022
National Research Centre, France
Title : Efficiency in utilization of phosphorus for symbiotic nitrogen fixation affects the phosphorus bio-availability in organic-horticulture soils of Herault valley

Abstract:

Phosphorus is one of the most limiting nutrients for plant growth in soil. Current study field experiments of Multilocation tests were carried out in various fields of production in the Herault valley (France). Two contrasting RILs of common bean 115 and 147 were used through three seasons during the years of 2007-2009. The final objective would be to get a variety that combines good adaptation to production constraints, an appropriate yield and grain quality. Both associated with rhizobial symbiosis for optimal nitrogen nutrition, and  the efficient use of phosphorus to increase the soil fertility, save mineral fertilizer, minimizing environmental risk. The parameters which we investigated were shoots and nodules dry weight, number of nodules, contents of nodule and plant P and plant N, soil total and Olsen P, calcium carbonate and soil pH. In many sites inhibition of nodulation was found to be associated with an excess of N mineralization from organic fertilization. Among other sites correlations between shoot and nodules dry weight were significant within some individual sites. The influence of phosphorus on nodulation and growth could be established in the fields where the RIL115, tolerant to P deficiency, produced significantly more biomass than the sensitive RIL147. Thus during the year of 2007 and 2009, significant correlations between plant growth and Olsen P were observed. It is concluded that the RILs can be used to assess the adaptation of grain legume to low both N and P in soils, to identify soils where P availability is deficient for the legume N2-dependent growth, and to improve the varieties of common bean for adaptation to low P. Phosphorus is one of the most limiting nutrients for plant growth in soil. Current study field experiments of Multilocation tests were carried out in various fields of production in the Herault valley (France). Two contrasting RILs of common bean 115 and 147 were used through three seasons during the years of 2007-2009. The final objective would be to get a variety that combines good adaptation to production constraints, an appropriate yield and grain quality. Both associated with rhizobial symbiosis for optimal nitrogen nutrition, and the efficient use of phosphorus to increase the soil fertility, save mineral fertilizer, minimizing environmental risk. The parameters which we investigated were shoots and nodules dry weight, number of nodules, contents of nodule and plant P and plant N, soil total and Olsen P, calcium carbonate and soil pH. In many sites inhibition of nodulation was found to be associated with an excess of N mineralization from organic fertilization. Among other sitescorrelations between shoot and nodules dry weight were significant within some individual sites. The influence of phosphorus on nodulation and growth could be established in the fields where the RIL115, tolerant to P deficiency, produced significantly more biomass than the sensitive RIL147. Thus during the year of 2007 and 2009, significant correlations between plant growth and Olsen P were observed. It is concluded that the RILs can be used to assess the adaptation of grain legume to low both N and P in soils, to identify soils where P availability is deficient for the legume N2-dependent growth, and to improve the varieties of common bean for adaptation to low P.

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