Resposta de genótipos de arroz ao parcelamento de nitrogênio

Abstract

The objective of this work was to determine the response of rice genotypes to splitting application of nitrogen in different development stages of crop, evaluating the agronomic, industrial and culinary characteristics. The experiment was conducted in the 2014/15 growing season, with sowing on 11/11/14. The experimental design was a randomized block in a factorial 3 x 6, three installments six genotypes of rice. The experimental design was a randomized block in a factorial scheme 3 x 6, being three splitting application of nitrogen and six rice genotypes. The splitting application of nitrogen was constituted as follows: i) one application of N (100%); ii) two applications of N (70 + 30%) and iii) three applications of N (70 + 20 + 10%). The factor of splitting application of nitrogen and your interaction with genotype was significant for rice yield and number of panicles. The splitting application of nitrogen factor only influenced the number of panicles, already for genotype factor occurred differences for all variables, except for weight yield. The conventional cultivar IRGA 424 RI showed high grain yield and high whole yield. To loose grains the cultivar Puitá Inta CL was classified by the cooking test as rice near the untied. The application of nitrogen in a whole dose or divided into two or three times do not differ. Thus, a complete application before the water intake is an alternative to reduce production costs.