Respostas quantitativas e qualitativas de genótipos de arroz irrigado ao parcelamento de nitrogênio

Abstract

Nitrogen fertilization is one of the main pillars to occur maximum response in the productive potential of each rice genotype. Differences in the application or total dose of nitrogen split in rice genotypes may be constituted in promising strategy to maximize the best use of this macronutrient. The objective of this study was to evaluate the quantitative and qualitative response regarding full or nitrogen in installments at different growth stages of hybrid and conventional genotypes of rice in the western border of Rio Grande do Sul. O experiment was conducted in two agricultural crops in 2013 / 14 and 2014/15, evaluating six genotypes of rice, four hybrids (Avaxi Cl, Inov Cl, Cl XP 102, 111 XP Cl) and two conventional cultivars (PUITA Inta Cl and Cl Guri Inta), submitted to the installment of application of nitrogen (N). The Installment was composed of three ways: i) an application (100% N); ii) two applications (70% + 30% N); iii) three applications (50% + 30% + 20% N). The cooking of the samples was simulated in beakers and graduated heating plate.The cooking of the samples was simulated in beakers and graduated hot plate at 400 ° C. About 40 g of the rice grains, added distilled water and soybean oil, to determine the output variables by weight and soltabilidade. The installment factor and their interactions with genotype, crop, and genotype x crop were not significant. Thus, the application of nitrogen in a whole or divided into two or three times do not differ. Thus, a full application before the water intake is an alternative to reduce production costs to farmers. Nitrogen installment did not affect the variables studied, suggesting as an alternative to reduce the cost of farming, a single application of nitrogen. For grain yield and whole hybrid XP 111 Cl have high average, as for soltabilidade highlights the growing PUITA INTA CL with next characteristic ideal. The effect of the rice storage time, analyzed indirectly affects the yield of integers and soltabilidade.