Abstract
ABSTRACT Although the use of inoculants containing rhizobia is encouraged, there are no official recommendations for inoculation of snap bean. In this respect, the aim of this study was to evaluate the agronomic performance of Rhizobium strains in symbiosis with snap bean cultivars with different growth habits and crop cycles. The experiment was carried out in pots with soil in a greenhouse in the spring-summer season in Lavras, state of Minas Gerais, Brazil. A completely randomized experimental design was used, with 4 replications, in a 4 × 7 factorial arrangement involving four snap bean cultivars and seven treatments – five strains of Rhizobium (UFLA 02-100, UFLA 02-127, UFLA 04-173, CIAT 899, and PRF 81), plus two controls without inoculation (with and without 500 mg N-NH4NO3∙dm–3). We conclude that: i) while genetic differences were observed among cultivars with respect to nodulating capacity, in all cases significant benefits were observed from BNF inoculation and ii) inoculation with selected strains of Rhizobium, as well as fertilization with mineral N, favors plant growtht, snap bean yields, and accumulation of N in the pods and, therefore, can fully substitute nitrogen fertilization in snap bean grown under protected cultivation.
Highlights
The use of inoculants containing rhizobia is encouraged, there are no official recommendations for inoculation of snap bean
We conclude that: i) while genetic differences were observed among cultivars with respect to nodulating capacity, in all cases significant benefits were observed from BNF inoculation and ii) inoculation with selected strains of Rhizobium, as well as fertilization with mineral N, favors plant growth, snap bean yields, and accumulation of N in the pods and, can fully substitute nitrogen fertilization in snap bean grown under protected cultivation
Just as for common bean, nitrogen (N) is the most limiting nutrient for snap bean and the most costly for the vegetable grower (Peixoto and Cardoso 2016; Soares et al 2016). Both have the capacity for biological fixation of atmospheric N through symbiosis with rhizobia, capable of providing at least part of the N required by the plant for its development, which translates into significant savings in the use of nitrogen fertilizer
Summary
The use of inoculants containing rhizobia is encouraged, there are no official recommendations for inoculation of snap bean. The aim of this study was to evaluate the agronomic performance of several Rhizobium strains, isolated from Amazon soils and recommended for common bean, in snap bean cultivars with different growth habits and crop cycles.
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