Relationship between phosphorus status and nitrogen fixation by common beans (Phaseolus vulgaris L.) under drip irrigation

Abstract

The current study aims to examine, the response of contrasted recombinant inbred lines of common bean to the application of phosphorus, to identify the bean recombinant inbred lines which were efficient in phosphorus utilization when dependent on nitrogen fixation as a source of nitrogen. The experiment was conducted at the experimental farm of Agricultural Research Station of the Nubaria district, Behera, Egypt, during the winter seasons of [2008][2009]. Three levels of mineral phosphorus fertilizers were applied (0, 45 and 90 kg ha -1 phosphorus pentoxide).Nodulation, plant growth parameters, leaf area, soil Olsen phosphorus, pH, and phosphorus and nitrogen of shoots, nodules and seeds were measured. The results have shown that the recombinant inbred lines responded positively to P application levels. The best values were observed in recombinant inbred lines 75, 83 and 34. Vegetative growth parameters were significantly enhanced by increasing levels of phosphorus. The highest level of phosphorus, i.e., 90 kg ha -1 phosphorus pentoxide gave the optimal values of growth parameters for all common bean recombinant inbred lines while control plants obtained the lowest values. An increase of Olsen-P and a decrease of soil pH were also observed with increases in phosphorus. These results led to the conclusions that phosphorus applied to Nubaria soil: (1) improved the soil fertility; (2) enhanced the ability of root nodules of common bean recombinant inbred lines to fix atmospheric nitrogen; and (3) increased the release of hydrogen by roots, thus decreasing soil pH and reducing the immobilization of phosphorus in the soil solution and transforming it into available form for the plant.

Nodulation, Nutrient Uptake and Yield of Common Bean Inoculated with Rhizobia and Trichoderma in an Acid Soil

“…For this reason, addition of phosphorus to the soil has been reported to result in enhanced nodulation of common bean in particular and other legumes, in general. Attar, Blavet, Selim, Abdelhamid, and Drevon (2012) reported higher nodule numbers in plants fertilized with phosphorus; in which case fertilization with 45 and 90 kg P 2 O 5 per ha resulted in 31 and 37 nodules per plant, respectively compared to 20 in unfertilized plants. In addition, Muthamia, Kimani, Chemining'wa, and Esilaba (2015) also reported that phosphorus nutrition has a strong influence on the nodulation of common bean, with unfertilized plants having much lower numbers of nodules even in the presence of microbial inoculants.…”

Reducing carbon: phosphorus ratio can enhance microbial phytin mineralization and lessen competition with maize for phosphorus

“…The applied P fertilizers increase soil available P for plants (Attar et al 2012;Djodjic & Mattsson 2013) and subsequently decrease the C:P ratio in the rhizosphere. In addition, increasing soil available P can also directly (DeForest et al 2012) or indirectly affect the C:P ratio by reducing the amount of carbohydrates released per unit of plant root (Schilling et al 1998), which influences the activity of MBP and soil P turnover in the rhizosphere.…”

Effect of P- Solubilizing Bacteria on Microbial Biomass P and Phosphatase Activity in Groundnut (Arachis hypogaea L) Rhizosphere

“…The significant increase in the microbial biomass carbon and phosphorus with addition of inorganic P fertilizer suggest that the applied water soluble P enhanced immediate P availability for crop uptake, which in turn might have increased the activities of root and rhizosphere microorganisms (Attar et al, 2012).…”