Uso de substâncias húmicas no crescimento inicial de mudas de pinha

Abstract

Among the various strategies to ensure seedling quality, humic substance is viable for the production of quality pine cone seedlings. The objective of this study was to evaluate the effect of humic substance applied to the substrate and via foliar application on the production of Annona squamosa L. seedlings. The experiment was conducted in a cultivation house under a randomized block design, with six treatments and four replicates. The treatments consisted of different doses of humic substance, being full or recommended dose (1): 2.5 mL L-1, half dose (1/2) and one and a half doses (1.5) obtained with the use of the commercial product Black Gold, with applications via foliar (F) and via substrate (S) being T1 - control (water application), T2 - application via substrate of the recommended dose, T3 - application via foliar of the recommended dose, T4 - Foliar application of the dose + application via substrate of half the dose (F + 1/2 S), T5 - Foliar application of the recommended dose + application via substrate of the recommended dose (F + S) and T6 - Foliar application of the recommended dose + application via substrate of one dose in the substrate (F + 1.5 S). The foliar application of the recommended dose associated with the application via substrate of the recommended dose (F + 1.0 S) promoted seedlings with greater leaf dry mass and greater amount of pigments. The humic substance applied by a combination of foliar application associated with application via substrate provided Annona squamosa L. seedlings with a greater amount of total chlorophyll and pheophtin (Total Chlorophyll, Carotenoid and Pheophtin). The application in two routes (substrate and foliar), using the recommended dose in the substrate, provided Annona squamosa L. seedlings with a greater accumulation of leaf biomass. Keywords: Pine cone; quality seedlings; bioinsums.