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- Title
Co-Inoculation with Azospirillum brasilense and Bradyrhizobium sp. Enhances Nitrogen Uptake and Yield in Field-Grown Cowpea and Did Not Change N-Fertilizer Recovery.
- Authors
Galindo, Fernando Shintate; Pagliari, Paulo Humberto; da Silva, Edson Cabral; Silva, Vinicius Martins; Fernandes, Guilherme Carlos; Rodrigues, Willian Lima; Céu, Elaine Garcia Oliveira; de Lima, Bruno Horschut; Jalal, Arshad; Muraoka, Takashi; Buzetti, Salatiér; Lavres, José; Teixeira Filho, Marcelo Carvalho Minhoto
- Abstract
This study was designed to investigate the effects of Azospirillum brasilense and Bradyrhizobium sp. co-inoculation coupled with N application on soil N levels and N in plants (total N, nitrate N-NO3− and ammonium N-NH4+), photosynthetic pigments, cowpea plant biomass and grain yield. An isotopic technique was employed to evaluate 15N fertilizer recovery and derivation. Field trials involved two inoculations—(i) single Bradyrhizobium sp. and (ii) Bradyrhizobium sp. + A. brasilense co-inoculation—and four N fertilizer rates (0, 20, 40 and 80 kg ha−1). The co-inoculation of Bradyrhizobium sp. + A. brasilense increased cowpea N uptake (an increase from 10 to 14%) and grain yield (an average increase of 8%) compared to the standard inoculation with Bradyrhizobium sp. specifically derived from soil and other sources without affecting 15N fertilizer recovery. There is no need for the supplementation of N via mineral fertilizers when A. brasilense co-inoculation is performed in a cowpea crop. However, even in the case of an NPK basal fertilization, applied N rates should remain below 20 kg N ha−1 when co-inoculation with Bradyrhizobium sp. and A. brasilense is performed.
- Subjects
AZOSPIRILLUM brasilense; COWPEA; BRADYRHIZOBIUM; PLANT biomass; PHOTOSYNTHETIC pigments; NITROGEN fixation
- Publication
Plants (2223-7747), 2022, Vol 11, Issue 14, pN.PAG
- ISSN
2223-7747
- Publication type
Article
- DOI
10.3390/plants11141847