Efeito da fonte de nitrogenio na diversidade da população de endofíticos em cana-de-açúcar

Abstract

The sugarcane crop is one of the most important in Brazil, with great expression, especially in the Southeast, Northeast and, more recently, in the Midwest.Some crop varieties have a very efficient biological nitrogen fixation system (FBN), which can guarantee a large part of the need for this nutrient. However, there is a reduced demand for nitrogen that can be explained by biological fixation, however, the lack of response to the application of nitrogen fertilizers results from the low efficiency of nutrient use by the crop. The response to fertilization is also influenced by other factors, such that short cycle cultivars, less vigorous and smaller seed tubers require higher doses of nitrogen. Nitrogen tends to lengthen the cycle and increase the vegetative vigor of the plants, being able, when in excess, to reduce the productivity and quality of the tubers. The low use of nitrogen by plants and the losses to the environment, we must be careful in increasing the application of nitrogen as it results in greater contamination of soil, air and water. The work will evaluate the effect of exclusive fertilization with ammonium on the population of endophytes, using different nitrogen sources to verify if there is variation in the population of endophytes, comparing the observed result with those who did not receive fertilization with any nitrogen source. that there is a difference in the population of endophytes when compared to the population without fertilization.

Key words: Nitrogen, sugar cane, endophytes