Análises morfogênicas e estruturais do Capim Andropogon sob aplicação foliar de substâncias húmicas e aminoácidos

Abstract

Humic substances and amino acids act in the growth and protein biosynthesis of tropical pastures, which in turn, enhance the productivity of morphogenic and structural characteristics and provide better ways of handling and understanding the dynamics of generation and expansion of the shape of the plant in space and time. Thus, the aim of this study was to evaluate the morphogenic and structural characteristics of andropogon grass under leaf application of humic substances and amino acids. The experiment was conducted in a 5x4 + 2 factorial scheme, comprising the combination (Humic Substances (SH); Humic Substances + Proline (SH + P); Humic Substances + Glycine (SH + G); Proline (P) and Glycine (G) and the second factor referring to four doses each (2.0; 4.0; 6.0 and 8.0 L ha-1), plus two controls, one composed by the commercial growth promoter, in the concentration of 2 L ha- 1, and the other in the absence of biostimulants. For the number of tillers (NP), SH + G was superior to the commercial product and the control by 17.2 and 44.31%, respectively, already in the Leaf Appearance Rate (TApF ) and Leaf Elongation Rate (TAlF), SH + G at a dose of 2.0 L ha-1, the highest responses were obtained (0.136 leaf day-1) and 6.39 cm day-1 respectively, with an increase in the TAlF of 13.12% when compared to the control, in general the source SH + G in the estimated average dose of 2.64 L ha-1 respectively, was the most promising, having an effective participation in the increase of the morphogenic characteristics and of leaf growth of plants, which demonstrates its greater efficiency in the final production of forage. Thus, biostimulants demonstrate positive results when applied by way of leaf, influencing the morphogenic and structural characteristics in andropogon grass.