Morfologia do sorgo sacarino sob influência do espaçamento entrelinha

Abstract

The objective of this work was to evaluate the morphological growth and chlorophyll content of sweet sorghum (Sorghum bicolor (L.) Moench) genotypes produced in the semi-arid region of Ceará, as a function of different spacings between the lines. The experiment was conducted at the Curu Valley Experimental Farm, in the municipality of Pentecoste - CE, from March to July 2015. The experimental design was a randomized complete block design with a 3x4x5 subdivision plot (three genotypes, four spacings between lines and 5 evaluation times) with four replicates. The three sorghum genotypes used were BRS 506, SF 15 and the hybrid 7C30, 50, 60, 70 and 80 cm between rows and five evaluation times in days after sowing were used for the spacings. For evaluations of the morphological variables, measurements were made every 15 days for plant height (AP), leaf number (NF), sheet angulation +3 (AF + 3) and mean stem diameter (DMC) and relative index Of chlorophyll. The non-parametric Kruskal-Wallis test (5%) was performed for the normal data, and analysis of variance (ANOVA) was performed. The data were submitted to tests of normality and homogeneity of the variance. That for the genotype factor will be done the Tukey test (5%) and for the time the polynomial regression. The results showed that the spacing between the lines did not statistically influence the variables analyzed in the genotype factor. However, the hybrid 7C30 obtained higher height than the other genotypes and smaller stem diameter. The BRS 506 that presented medium results in its evaluations was the most outstanding in the field.