-Pigeon pea is an important protein source grown in several tropical and sub-tropical countries, and is considered a multi-purpose plant that is resistant to the conditions of the Brazilian Cerrado. Among the possible uses for cowpea, its use as a green manure, increasing soil nitrogen content through the association with diazotrophic bacteria, generically known as rhizobia, is noteworthy. The present work aimed to evaluate the efficiency of Rhizobium strains isolated from cowpea plants in the development of pigeon peas cultured in Red Latosol. The experiment was conducted in a greenhouse, using a completely randomized design with seven treatments and four replications. Treatments consisted of inoculation with four Rhizobium strains (MT8, MT15, MT16, and MT23) and one commercial inoculant comprising Bradyrhizobium spp. strains BR 2801 and BR 2003. There were two controls, one absolute (without inoculation or nitrogen fertilization) and the other with nitrogen fertilization. Each experimental plot consisted of an 8-dm 3 vase containing three plants. Analyzed variables included plant height, SPAD index, number and dry weight of nodules, and shoot and root dry masses. Pigeon peas responded significantly to inoculation treatment, since all the plants inoculated with Rhizobium strains isolated from cowpea strains showed results similar to plants in the nitrogen control and commercial inoculant treatments. This demonstrates a favorable plant-bacteria interaction, which can be utilized as an alternative nitrogen source for pigeon peas.Keywords: Cajanus cajan. Cerrado. Inoculation. DESENVOLVIMENTO DO FEIJÃO GUANDU INOCULADO COM RIZÓBIO ISOLADO DE PLANTAS ISCAS DE FEIJÃO CAUPIRESUMO -O feijão guandu é uma importante fonte proteica usada em diversos países dos trópicos e subtrópicos, sendo considerada uma planta de múltiplos usos e resistente às condições do Cerrado brasileiro. Dentre as atividades utilizadas, destaca-se o emprego como adubo verde, promovendo aumento do teor de nitrogênio no solo através da associação com bactérias diazotróficas genericamente conhecidas como rizóbio. Este trabalho teve por objetivo avaliar a eficiência de estirpes de rizóbio isoladas de plantas de feijão caupi sobre o desenvolvimento do feijão guandu cultivado em Latossolo Vermelho. O experimento foi conduzido em casa de vegetação, em delineamento experimental inteiramente casualizado com sete tratamentos e quatro repetições. Os tratamentos foram constituídos de cinco estirpes de rizóbio (MT8, MT15, MT16, MT23, um inoculante comercial composto pelas estirpes BR 2801 e BR 2003 de Bradyrhizobium spp.) e duas testemunhas, sendo uma absoluta (sem inoculação e sem adubação nitrogenada) e outra com adubação nitrogenada. Cada parcela experimental foi composta por um vaso de 8 dm 3 , contendo três plantas. As variáveis analisadas foram altura de plantas, índice SPAD, número e massa seca de nódulos e massa seca da parte aérea e das raízes. O feijão guandu respondeu significativamente aos tratamentos com inoculação, onde todas as estirpes ...

The safflower (Carthamus tinctorius L.), in particular, has been soaring in significance as an alternative for oil and biodiesel production. In this context, the goal of this study was to assess the influence exerted by phosphate fertilization on the phytometric and productive characteristics of the safflower raised on the Oxisol of the Cerrado. The experiment was performed in a greenhouse, using pots of 3 dm ) and six replicates were included. The following variables were estimated, viz., number of leaves, plant height, and stem diameter, besides chlorophyll index (SPAD index), number of chapters and shoot dry matter. Barring the shoot dry matter and number of chapters, all the other variables were evaluated on days 30 and 45 after the plants were transplanted. Data were submitted to analysis of variance at 1%, 5% and 10% probabilities, and regression analysis, at 1% and 5% probabilities, respectively. All the variables revealed significant differences and adjustments to the linear regression model (P < 0.1), excepting the SPAD index on day 30 after the plant emergence which was adjusted to the quadratic regression model. The highest findings of 24.47 for leaf number, 34.97 cm for plant height, 3.76 mm for stem diameter, 64.76 for chlorophyll index, 5 units for the number of chapters and 3.45 g for dry shoot mass were recorded in response to the highest phosphorus dose in the experimental range (P 2 O 5 : 540 mg·dm −3

The aim of this study was to evaluate the effect of inoculation with rhizobium and co -inoculation with Azospirillum brasilense on phytometric characteristics of peanut plants grown in Latossolo Vermelho (Oxisol) with and without compaction. The experiment was conducted in a greenhouse, with a randomized block design in a 5x2 factorial scheme and 4 replicates, totaling 40 experimental units. Treatments were composed by commercial inoculant for peanuts (SEMIA 6144 strain); MT 15 strain; combination of MT 15 + A. brasilense; nitrogen control and absolute control. Plant height, number of leaves, number of branches per plant, stem diameter and Falker chlorophyll index were evaluated. The data were subjected to analysis of variance and, when significant, to Tukey test at 1% probability level. For the variables plant height, number of leaves, number of branches and stem diameter, the results were similar for all treatments, except for the absolute control and number of branches at 90 days after emergence (DAE) and stem diameter at 30 and 90 DAE. For stem diameter at 30 DAE, the results were similar to those found in the treatments with co -inoculation, commercial inoculant and nitrogen fertilization. There was interaction for Falker chlorophyll index at 60 DAE, with the best result found in the MT 15 strain. Inoculation with MT15 and co-inoculation with A. brasilense promoted good performance in peanut crop in terms of phytometric characteristics in soil with and without compaction.

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