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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.

Soil fertilization and the management of green manure are needed to maintain and increase the soil fertility of Cerrado. Thus, the objective of this study was to evaluate the concentration of nutrients in the shoots and roots of pigeon pea that was fertilized with phosphorus sources that are associated with liming in Cerrado Oxisol. This study was conducted in a greenhouse with a completely randomized design in a 3×2 factorial arrangement with twelve repetitions. The rock phosphate, triple superphosphate and control treatments were associated with the presence and absence of liming; the sources of phosphorus were evaluated. The chlorophyll index and the concentrations of nitrogen, phosphorus, potassium, calcium, magnesium and sulfur in the shoots and roots of pigeon pea that was grown for a period of 107 days were evaluated. In general, the chlorophyll index and nutrient concentration of pigeon pea did not differ when fertilized with phosphate rock and triple superphosphate. The fertilization with rock phosphate and triple superphosphate provides a greater nutrient absorption of pigeon pea in the presence of lime.

O objetivo deste estudo foi determinar o desenvolvimento do capim Marandu (Urochloa brizantha cv. Marandu) submetido à inoculação com bactérias diazotróficas associadas e cultivadas em Latossolo Vermelho do Cerrado. O experimento foi conduzido em casa de vegetação, com delineamento inteiramente casualizado e cinco tratamentos composto por três estirpes de bactérias associativas fixadoras de nitrogênio, Y2 (Nitrospirillum amazonense), MTH2 (similar à Herbaspirillum spp.), MTB1 (similar à Burkholderia spp.), um inoculante comercial formado pela combinação das estirpes Ab-V5 e Ab-V6 (Azospirillum brasilense), um controle 100 mg dm-3 N-uréia e cinco repetições, foram inoculadas pela inserção de uma alíquota de 3 mL de caldo bacteriano contendo 109 mL-1 de células no solo próximo ao sistema radicular de cada planta. Foram realizados três cortes aos 30, 60 e 90 dias após a semeadura e avaliou-se altura da planta, número de folhas, matéria seca de parte aérea e da raiz do capim Marandu. A altura das plantas (P

In Brazil, the peanut culture has been expanding mainly in the state of São Paulo, responsible for 80% of the national production. It is an edible culture produces oil of excellent quality, contains proteins rich in amino acids that make up to 36% of weight of the grain. Furthermore, it is associated with nitrogen-fixing bacteria. However, the practice of inoculation is not very common in peanuts, being this species considered susceptible to nodularity with a large number of rhizobia. However, known's that inoculation with selected strains can increase the efficiency of symbiosis and peanut yield. Thus, the present study was proposed to evaluate the development of peanut inoculated with rhizobia and grown in Cerrado's Oxisol. The experiment was conducted in a greenhouse, in a completely randomized design, five treatments, one cultivar (IAC 505) and four replicates. The treatments were composed of three strains of rhizobia and two controls, one absolute and the other with nitrogen fertilizer (50 mg•N•dm 3 ). Each experimental plot has been consisted an 8 dm 3 pot with three plants. The inoculation was done, applying 3 mL of bacterial broth (108 mL −1 cells) in the root system of each plant. The SPAD index, number and dry weight of nodules, dry mass of shoots and roots, number and weight of grains were analyzed. The response of Peanuts inoculated was significantly, as all inoculated plants showed similar development to nitrogen-fertilized, emphasizing the potential for supplying nitrogen in peanut development.