Abstract
Abstract: The objective of this work was to compare distributions for the modeling of the number and dry matter weight of nodules (DWN) of Rhizobium from different inoculants in common bean (Phaseolus vulgaris) inbred lines subjected to nitrogen doses, as well as to identify the best inoculant for those lines. The experiment was carried out in a randomized complete block design, arranged in split-split plots, with three factors - four inbred lines, five nitrogen doses (0, 20, 40, 60, and 80 kg ha-1), and three inoculants (CIAT 899, UFLA 02-100, and peat) - and four replicates. The number of nodules and their dry matter weight were analyzed with the generalized linear mixed modeling approach. The highest number of nodules was obtained with the CIAT 899 inoculant, at the dose of 20 kg ha-1 N (260 nodules), followed by UFLA 02-100, at 80 kg ha-1 (109 nodules), and peat alone at 20 kg ha-1 (98 nodules). The DWN with CIAT 899 exceeded in 0.66 g the DWN with UFLA 02-100, and in 0.95 g the DWN obtained without inoculation (inoculated with peat alone). The use of the negative binomial distribution and of the gamma distribution is a simple way to control data overdispersion of the nodule number and data underdispersion of DWN, respectively.
Highlights
Studies on Rhizobium inoculation and other plant growth promoting rhizobacteria (PGPR), under Brazilian conditions (Hungria et al, 2003), have been immensely important for improving the crop performance of common bean (Phaseolus vulgaris L.).Nodulation and symbiotic nitrogen fixation (SNF) depend on the microsymbiont strain, N availability, and plant cultivar
Rhizobium tropici CIAT 899 is an efficient strain approved for commercial use in Brazil (Hungria et al, 2003)
The objective of this work was to compare distributions for the modeling of the number and dry matter weight of Rhizobium nodules from different inoculants in common bean inbred lines subjected to N doses, as well as to identify the best inoculant for those lines
Summary
Studies on Rhizobium inoculation and other plant growth promoting rhizobacteria (PGPR), under Brazilian conditions (Hungria et al, 2003), have been immensely important for improving the crop performance of common bean (Phaseolus vulgaris L.).Nodulation and symbiotic nitrogen fixation (SNF) depend on the microsymbiont strain, N availability, and plant cultivar. Studies on Rhizobium inoculation and other plant growth promoting rhizobacteria (PGPR), under Brazilian conditions (Hungria et al, 2003), have been immensely important for improving the crop performance of common bean (Phaseolus vulgaris L.). According to Hungria et al (2015), Rhizobium is certainly one of the most employed PGPR in the world. Increased SNF in Southern Brazil Oxisols has been observed with the use of Rhizobium. Rhizobium tropici CIAT 899 is an efficient strain approved for commercial use in Brazil (Hungria et al, 2003). As P. vulgaris is a relatively promiscuous host, new Rhizobium spp. nodulating common beans are frequently reported, in different parts of the world, which means that their classification is always under review (Vieira et al, 2010)
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