Phosphorus Availability in Wheat, in Volcanic Soils Inoculated with Phosphate-Solubilizing Bacillus thuringiensis

Jorge Delfim, Mauricio Schoebitz, Leandro Paulino, Juan Hirzel and Erick Zagal
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Jorge Delfim: Department of Soils and Natural Resources, Faculty of Agronomy, Universidad de Concepción, Campus Chillan, Avenida Vicente Méndez 595, P.O. Box 537, Chillán 3812120, Chile
Mauricio Schoebitz: Department of Soils and Natural Resources, Faculty of Agronomy, Universidad de Concepción, Campus Chillan, Avenida Vicente Méndez 595, P.O. Box 537, Chillán 3812120, Chile
Leandro Paulino: Department of Soils and Natural Resources, Faculty of Agronomy, Universidad de Concepción, Campus Chillan, Avenida Vicente Méndez 595, P.O. Box 537, Chillán 3812120, Chile
Juan Hirzel: Instituto de Investigaciones Agropecuarias, INIA Quilamapu, Avenida Vicente Méndez 515, Chillán 3812120, Chile
Erick Zagal: Department of Soils and Natural Resources, Faculty of Agronomy, Universidad de Concepción, Campus Chillan, Avenida Vicente Méndez 595, P.O. Box 537, Chillán 3812120, Chile

Sustainability, 2018, vol. 10, issue 1, 1-15

Abstract: The use of phosphate solubilizing bacteria (PSB) is an ecological strategy that allows for increasing the availability of phosphorus (P) in soil. The objective of this study was to evaluate P availability in wheat, in soils derived from volcanic ash (Andisol and Ultisol,) and inoculated with phosphate-solubilizing Bacillus thuringiensis, the experiment was conducted in pots under greenhouse conditions using a completely randomized design. Wheat plants were inoculated and re-inoculated at 20 and 46 days after sowing (DAS), respectively, with B. thuringiensis ; and, soil and plant sampling was performed after 46, 66, and 87 days based on the Zadoks growth scale (Z). The inoculation resulted in an 11% increase in P of the rhizosphere at Z46 (Ultisol), P also increased 34% and 67% in aerial tissues at Z46 (Andisol and Ultisol), respectively, while an increase of 75% was observed in root tissues at Z87 (Ultisol). Similarly, the inoculation resulted in increases in acid phosphatase activity (Andisol), soil microbial biomass (Andisol and Ultisol), and root biomass in plants (Ultisol), without achieving increase of the aerial biomass of the plants. The phosphate solubilizing B. thuringiensis strain showed some positive, but also negative effects in soils and plants, depending on the soil.

Keywords: phosphate solubilization; rhizosphere; phosphorus availability; volcanic soils; Bacillus thuringiensis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
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