Eficiência do nitrogênio e divergência genética em milho visando à produção de proteína

Abstract

The genetic diversity of maize populations, coupled with the efficiency and use of nutrients, allows the identification of populations that may be used as parents in future breeding programs. Thus, were realized four trials of maize populations in the year 2010, be two installate in inter-crop period and two crops period, in Center Agrotechnological - University Federal of Tocantins, in Palmas city of Tocantins State. At each period, populations were conducted under high and low N (150 kg ha-1 N and 0 kg ha-1 N) respectively in the coverage. The experimental design used in each trial was randomized blocks with three replications and 10 treatments. We studied the characteristic percentage of protein and determined the EUN by populations, using the methodology from Fischer. The genetic diversity was performed by multivariate procedures: Mahalanobis distance and grouping method of Tocher in the study of genetic diversity, each trial representing a distinct variable in the multivariate model. The lower content of protein were obtained under low N the crop period. The Populations POP 3 and POP 13 were efficiency and promising for protein production.