Adubação orgânica e mineral no crescimento de microorganismo da risosfera de capuchinha.

Abstract

Nasturtium (Tropaeolum majus L.), an unconventional food plant (PANC), has high nutritional value and promotes the activity of microorganisms rhizospheric. Organic fertilization intensifies this interaction, benefiting the plant development and soil fertility. In this sense, the objective was to evaluate the occurrence and density of rhizosphere microorganisms and growth of nasturtium (Tropaeolum Majus L.) subjected to organic and mineral fertilization. The experiment was conducted in a greenhouse belonging to the Science and Technology Center Agrifood of the Federal University of Campina Grande, Pombal-PB. In which the The experimental design used was randomized blocks, with seven treatments and a nasturtium cultivar (Tropaeolum majus L.), with four repetitions and two plants per plot, totaling 56 experimental units. You treatments were: T1 = No fertilization (control); T2 = Nitrogen fertilization (AN); T3 = Fertilization with manure in a proportion of 50%, T4 = Fertilization with manure in the proportion of 75%, T5 = Fertilization with manure in the proportion of 100%, T6 = Fertilization with manure in the proportion of 125%, T7 = Fertilization with manure in proportion of 150% of the recommendation. Assessed the occurrence and density of actinomycetes, bacteria and fungi by the drop plating method on media specific. For growth, evaluations of the parameters were made plant development after 83 days, such as: height, number of leaves and flowers and rod diameter. The data obtained were evaluated by the “F” test, in cases of significance was performed by comparing means using the Scott Knott test at 5% probability.Organic fertilization improved the development of the aerial part of nasturtium, induced flowering and greater density of bacteria in its rhizosphere, but the populations of bacteria, fungi and actinomycetes were lower than the ground.