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RIA. Revista de investigaciones agropecuarias
On-line version ISSN 1669-2314
Abstract
CLUA, A; OLGIATI, J and BELTRANO, J. Evaluación de la doble inoculación Bradyrhizobium-micorrizas y el uso de fitoterápicos de semilla en el crecimiento, eficiencia de inoculación y el rendimiento de un cultivo de soja. RIA. Rev. investig. agropecu. [online]. 2013, vol.39, n.3, pp.250-258. ISSN 1669-2314.
Soil fertility is a relevant aspect of agricultural production, particularly so in soybean crops. Biofertilizers such as Bradyrhizobium japonicum and arbuscular mycorrhizal fungi (AMF) are studied in order to find sustainable alternatives to providing crops with mineral nutrients. The aim of this work was to study the effect of the coinoculation of Bradyrhizobium-mycorrhizal fungi on the growth and yield of Glycine max and its interaction with the fungicides applied to seeds. The experiment was conducted on a soybean crop planted at Lobos, Buenos Aires province. The treatments were: Control: no inoculation (C); Inoculation with B. japonicum (IB); combined inoculation of Bradyrhizobium-mycorrhizal (IBM); Inoculation with Bradyrhizobium + fungicides (IBC); combined inoculation + fungicides (IBMC). In the experiment the following were determined: growth parameters, nodulation and mycorrhization efficiency, and yield and its components. The IBM and IBMC treatments showed a significant increase in growth parameters, around 40% compared to control. All treatments significantly increased the number of nodulated plants compared with the control. The number of nodules per plant was significantly higher in all inoculated treatments compared with the control, and the highest values were observed with the co-inoculation treatments as compared with single inoculation treatments. IBM and IBMC treatments increased the percentage of mycorrhizal roots compared with the control. IB, IBC, and IBMC treatments showed a significant increase in yield: 4,750 Kg ha-1; 4,825 Kg ha-1, and 4,850 Kg ha-1, respectively, compared with the control (4,100 Kg ha-1). The yield was increased in the combined inoculation and fungicide (IBMC) treatments and those inoculated with Bradyrhizobium japonicum only, independently of fungicide use (IB and IBC).
Keywords : Glycine max; Glomus mosseae; Nodulation.
