Inoculação de Trichoderma asperellum e doses de nitrogênio em trigo

Abstract

The increase in wheat production costs, resulting from the high prices of nitrogen inputs, enhances research with the use of microbiological agents that allow, through partial or total replacement, the supply of inorganic-N to plants. The present study aimed to evaluate the use of inoculation of Trichoderma asperellum in wheat culture associated with nitrogen doses. The experiment was carried out in the field in the municipality of Senador Salgado Filho, RS. The experimental design used was randomized blocks (DBC) in a 2x3 factorial scheme, with 4 replications. Factor A is represented by inoculation of wheat seeds with T. asperellum URM 5911 (with and without inoculation), and factor D by nitrogen rates (0, 60, 120 kg ha-1). The wheat cultivar LG Oro was evaluated by the number of tillers, height, grains per ear, thousand-grain mass and grain yield. There was a significant interaction between the factors for the grain yield variable. The average grain yield with inoculation of T. asperellum at all levels of nitrogen fertilization was significantly higher when compared to the non-use of the microorganism, at the same doses. The number of tillers per plant and the weight of a thousand grains were significant for the factor D, individually, presenting a linear increase, according to the increment of the N doses. It is concluded, under the conditions of this study, that the inoculation of T. asperellum allowed the total replacement of N supplementation via nitrogen fertilization with urea in wheat for the variable grain yield.