Abstract
ABSTRACT The inoculation of rhizobia in lima bean can increase its yield and contribute to smallholder farms. In this study, the potential of rhizobia in increasing the lima bean yield was evaluated in two regions from Piaui and Ceara states. The experiments were conducted in field comparing three rhizobia strains (UFPI32, UFPI38, UFPI59), one strain of reference to Phaseolus vulgaris (CIAT899) and two controls (with and without nitrogen). The parameters of nodulation, N accumulation and yield varied between treatments and locations. The nodule biomasses were higher in UFPI59 and UFPI32 (Piaui), and CIAT899 and UFPI32 (Ceara). The highest values of nodule size were found in treatments UFPI59 in both locations. Lima bean presented highest values of leaf N in UFPI59 and CIAT899. The highest values of grain yield were found in the treatment UFPI59 as compared to CIAT899 and the controls. The results confirmed the potential of UFPI59 in promoting nodulation, N accumulation, plant growth and yield of lima bean in both locations.
Highlights
Lima bean (Phaseolus lunatus) is an important legume crop cultivated in some countries of North, Central and South America (Amorim et al, 2019), representing a substantial source of protein (Araujo et al, 2015)
CIAT899 has promoted higher nodule number (NN) and NDW in lima bean grown in Ceará, the value of Nodules size (NS) was highest with UFPI59
The results showed different responses to nodulation, i.e. nodule number and dry weight, in lima bean grown in Ceará and Piauí
Summary
Lima bean (Phaseolus lunatus) is an important legume crop cultivated in some countries of North, Central and South America (Amorim et al, 2019), representing a substantial source of protein (Araujo et al, 2015). Previous studies, under greenhouse conditions, have reported N-fixing rhizobia contributing, through BNF, to the growth of lima bean (Costa Neto et al, 2017; Amorim et al, 2019). Rhizobia isolated from a region and adapted to its specific soil conditions need to be evaluated in different locations and conditions, such as temperature, chemical properties and population of native bacteria (Koskey et al, 2017; Irisarri et al, 2019). The optimization of BNF, by the selection of efficient N-fixing rhizobia, could contribute for increasing the lima bean yield. The aim of this field study was to evaluate the potential of rhizobia in increasing the lima bean yield in two regions from Piaui and Ceará states
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