Bioestimulantes e protetor solar no crescimento inicial de mudas de café

Abstract

The search for agricultural development combined with sustainable agriculture is in the spotlight. The use of bioactives is an alternative to sustainably maximize agricultural production, such as the use of sunscreens and biostimulants. Sunscreens prevent photo-oxidative stress in plants, while biostimulants can promote their greater development, constituting inputs of interest in agriculture. Thus, the objective of this research was to evaluate the effects of sunscreens and biostimulants on the initial growth of coffee seedlings. The experiment was installed in the experimental area of the Federal University of Mato Grosso do Sul – Chapadão do Sul Campus, installed in randomized blocks in a 2 x 6 factorial scheme, with four replications, with IPR 100 Arabica coffee, grown in tubes. The treatments resulted from the presence and absence of sunscreen, five biostimulants and the control, without biostimulant. The parameters evaluated were plant height, stem diameter, number of leaves, root volume, leaf area, leaf dry mass, stem dry mass, root dry mass and total dry mass. Sunscreen associated with biostimulants provided better results in all parameters analyzed, including the control treatment without biostimulant. Regardless of the association with sunscreen, treatments with Bacillus pumillus + B. subtilus + B. velezensis (BAC1) positively influenced plant height, stem diameter, number of leaves, leaf area, dry mass of leaves, stems, roots and total dry mass of coffee seedlings. Treatment with Bacillus pumillus + B. subtilus + B. amyloliquefaciens (BAC2) provided better results in plant height, number of leaves, dry mass of leaves, stems, roots and total dry mass of coffee seedlings when applied alone, without association with sunscreen.