Matheus Henrique Todeschini

Eficiência de uso do Nitrogênio em cultivares modernas de trigo

Bragantia, Campinas, v. 75, n. 3, p.351-361, 2016 ABSTRACT: The nitrogen use efficiency (NUE) is defined as the capacity of a given genotype in take advantage of the applied nitrogen (N) and transform it in biomass and grains. The objective of this study was to evaluate 12 wheat cultivars as to the NUE and its components. The experiment was conducted in a controlled environment, in a randomized block design with three replications. Twelve wheat cultivars were submitted to four N supply levels (0, 80, 160 and 240 kg of N∙ha–1). The data were submitted to analysis of variance, means multiple comparison, polynomial regression, and path analysis. The nitrogen remobilization efficiency (NRE) was the SOIL AND PLANT NUTRITION ArticleThe nitrogen use efficiency (NUE) is defined as the capacity of a given genotype in take advantage of the applied nitrogen (N) and transform it in biomass and grains. The objective of this study was to evaluate 12 wheat cultivars as to the NUE and its components. The experiment was conducted in a controlled environment, in a randomized block design with three replications. Twelve wheat cultivars were submitted to four N supply levels (0, 80, 160 and 240 kg of N∙ha–1). The data were submitted to analysis of variance, means multiple comparison, polynomial regression, and path analysis. The nitrogen remobilization efficiency (NRE) was the main NUE component of the evaluated cultivars, in both low and high conditions of nitrogen fertilization. In the cultivars average, the nitrogen utilization efficiency (NUtE) presented reduction tendency as the N supply was increased, tending to stabilization at the dose of 231 kg of N∙ha–1. The wheat cultivars Mirante, TBIO Itaipu, BRS Parrudo, and TBIO Iguacu were the most efficient on the N use, and the first two were also efficient in remobilizing the N from the phytomass to the grains.

Seleção de genótipos de trigo para rendimento de grãos e qualidade de panificação em ensaios multiambientes

The objective of this study was to select wheat lines for baking quality and grain yield in multi-environment trials in order to identify ideal test environments for selection. A total of 39 wheat genotypes, 18 inbred lines and 9 checks were evaluated in 2010, and other 11 inbred lines and 4 checks in 2011, in the state of Parana. Some lines and locations were not repeated between the two years. The experimental design was a randomized block design with three replications. GGE biplot analysis (Genotype and Genotype-by-environment) was used to evaluate the genotypes and test environments. The locations Nova Fatima, Pitangueiras and Ventania were discriminative (maximized the expression of yield potential and the differentiation among genotypes) and representatives of the environments evaluated in the 2010 crop season. Rolândia and Astorga stood out as ideal environments to select better genotypes for baking quality in 2011. The inbred lines BIO-08528 and BIO-08228 were classified as ideal genotypes for grain yield (GY) and grain protein concentration (GPC), respectively. However, in 2011 the inbred lines BIO-10161 and BIO-10141 were superior for baking quality and GY, respectively. SDS sedimentation test and GPC were correlated each other (r= 0,61**) and moderately associated with the gluten strength (r=0,49 and** 0,74**), indicating that both traits can be used for indirect selection of baking quality.