Abstract
The aim of this study was to evaluate the effects of foliar application of molybdenum and small dose of nitrogen at planting on common bean production when using seed inoculation with rhizobia. Two field experiments were conducted, applying a randomized block design and a factorial arrangement (3x2x2) + 1, with three replicates. Treatments consisted of inoculation with Rhizobium spp. (strain CIAT 899 T , strain UFLA 02-100, and uninoculated), foliar application of molybdenum (0 and 80 g ha -1 ), and fertilization with N-urea at planting (0 and 20 kg ha -1 ), with an additional N treatment of 40 applied at planting and 40 kg ha -1 applied as topdressing. The foliar application of molybdenum did not favor the nodulation, but its effect on yield was dependent on the chemical soil characteristics, providing highest yield in soil at Patos de Minas with pH more acid and with higher phosphorus and organic matter concentrations. Small dose of nitrogen applied at planting did not reduce nodulation of bean inoculated with rhizobia, but it can reduce the seeds emergence, thus negatively affecting yield. The native rhizobia promoted nodulation, the plant growth, shoot N accumulation and yield similar to the treatments that received inoculations of rhizobia strains.
Highlights
Brazil is the largest producer and consumer of common bean in the world
The mean values of number and dry weight of nodules did not differ between inoculation treatments
A negative effect of Mo fertilization was not observed in Pitangui (Figure 2A and B) due to the higher pH of the soil (5.8), which increased the availability of the micronutrient and avoid the detrimental effects of its application (Ferreira, Andrade, & Araújo, 2004)
Summary
Brazil is the largest producer and consumer of common bean in the world. Besides, this legume species is an important protein source in the Brazilian population’s diet.Nitrogen (N) is the nutrient consumed by and exported in the bean plant in the greatest quantities. Brazil is the largest producer and consumer of common bean in the world. This legume species is an important protein source in the Brazilian population’s diet. Nitrogen (N) is the nutrient consumed by and exported in the bean plant in the greatest quantities. 85-92, Jan.-Mar., 2016 especially at planting, negatively affect nodulation and BNF (Soares et al, 2006; Souza, Soratto, & Pagani, 2011), and may affect the germination and the emergence of common bean (Kikuti, Andrade, Carvalho, & Morais, 2005; Alves Júnior, Andrade, Carvalho, Vieira, & Morais, 2009). For the state of Minas Gerais, under field conditions, it has not been yet established a safe N dose in the planting furrow that does not reduce nodulation and BNF, and not have the salt effect of nitrogen fertilizer
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