Influence of 2 types of soils in the performance of strawberry plants cv Camarosa inoculated with plant growth promoting bacteria

DELAPORTE QUINTANA, PAOLA; LOVAISA, NADIA C.; GUERRERO MOLINA, MARÍA F.; SALAZAR, SERGIO M.; PEDRAZA, RAÚL O.

La Falda

Congreso; II Workshop Latinoamericano sobre PGPR; 2014

The province of Tucumán produces strawberry during 12 months of the year in northwest of Argentina because of excellent agro-ecological conditions for this crop. Although this crop is frequently grown in soils with good natural fertility, high doses of chemical fertilizers are applied toimprove fruit yield. The plant growth promoting bacteria (PGPB) are a group of different genera thatcan improve the growth and productivity of plants. The possibility of using them as biofertilizer instrawberry crop support the development of a sustainable agriculture because they can improve theplant performance by reducing or avoiding the application of agrochemicals, with a consequentreduction of damage to the agro-ecosystem.The aim of this study was to analyze the effect of the inoculation with two PGPB, Azospirillum brasilense REC3 and Burkholderia sp A-FTV3 on fruit yield of strawberry plants (Fragaria ananassa Duch.) cv. ?Camarosa? grown in two soils with different fertility. Bacteria were applied by dipping roots for 30 minutes in an aqueous suspension with REC3, AFTV3and the mixture of both, with a final concentration of about 106 cfu/ml. The roots ofuninoculated plants (control) were immersed the same time in sterile distilled water. Threeliterplastic pots containing perlome:peat:soil (1:1:2) were used; in this composition soils were: (i) low inorganic matter and phosphorus (Tafi del Valle) and (ii) rich in organic matter and phosphorus (Famaillá). The substrates were not sterilized (to maintain the microflora of each locality).Treatments with different soils were designated with the code of the bacteria plus the letter T (Tafidel Valle) and F (Famaillá). Ten plants per treatment were assessed in a factorial design. Data weresubjected to ANOVA and test of statistical significance. The results showed that bacterial treatments applied individually had higher fruit yields than theuninoculated controls. In Tafi del Valle´s soil the average values (fruit grams per plant) were: 106.6 gin REC3-T; 93.84 g in A-FTV3-T; 77.9 g in Mixed-T and 80.2 g in Control-T. The results inFamaillá´s soil were: 65.45 g in REC3-F; 84.04 g in A-FTV3-F; 51.21 g in Mixed-F and 54.2 g inControl-F. Treatments with the bacterial mixture on both substrates had lower values than controls.Comparing the two substrates, the highest fruit yields were recorded with Tafi del Valle´s soil, being27% higher than with Famaillá´s soil. This can be attributed to the better performance of the PGPBin environmental conditions with nutritional constraints.