No abstract

Spatial variability evaluation of qualitative attributes can be used as an excellent strategy to design forms of intervention that result in better crop profitability for some agricultural crops, for example, sugarcane. Based on the assumption that qualitative attributes of sugarcane present spatial variability and their distributions along the stems are uniform in different varieties, this study aimed to evaluate the distributions of the qualitative parameters of different sugarcane varieties and the spatial variability of these attributes in a commercial field. Samples of nine varieties were collected for laboratory quality analysis, and the Brix parameter was analyzed by a digital refractometer. The analysis of variance, the Tukey test, and geoestatistcs were the statistical analyses applied to the dataset. The maps were generated using 91 sample results from the laboratory analysis of the 16.6 ha field. It was found that, in the harvest period, there was no significant difference in Brix content along the sugarcane stems. Therefore, we can conclude that the Brix content along the sugarcane stems does not change in the harvesting period, and the ideal sampling size to better represent the factors affecting sugarcane qualitative attributes is six points per hectare.

e Nutrição, e aos funcionários Rosemary Leonessa da Silva, Sylvino Luiz Torrezan, e Pedro Dorival Lucentini do mesmo departamento, por toda a ajuda e prontidão com as análises laboratoriais. À empresa VERION, na pessoa do Eng. Agr. Franz Pavlu, por todo o apoio. À toda a equipe da empresa Raizen, na pessoa do Eng. Agr. Pedro Lian Demétrio Barbieri Castanho, pela ajuda com as informações e coleta das amostras. Aos meus grandes amigos, André Freitas Colaço, Leonardo Maldaner e Mateus Tonini Eitelwein, pela convivência e ajuda com a coleta de campo. A todos os alunos da pós-graduação e ao Gmap, pela troca de experiências, convívio e amizade. À República Kombat, pela eterna amizade e convivência. Ao meu irmão Tarso Nascimbem Ferraz, pela grande e eterna amizade, e por ser um ótimo exemplo de vida. E, finalmente, agradeço a minha querida namorada Aline Carvalho Girotto, por todo o companheirismo, amor e momentos felizes.