Características do resíduo de minera??o de areia como componente de substratos para a produ??o de mudas de pupunheira (Bactris Gasipaes Kunth)

摘要

The objective of this experiment was to evaluate the physical, chemical and biological characteristics of fine sand mining residue as a component of the substrate for production of peach palm seedlings. Thus, it was tested four substrate with the proportions of sand mining residue: carbonized rice husk (RA/CA): 1:0; 3:1; 1:1; 1:3, and compared to the control substrate: 3:1 (alic podzolic yellow latosol:buffalo manure). It was used a random block experimental design, with five replications, with 10 seedlings per plot. Peach palm seedlings were produced in 1.1-L containers in a protected environment. When seedlings were ready to be transplanted to the field, 210 days after the transplanting to bags, stem base diameter, seedlings height, number of leaves, dry mass of aerial part and root were measured. It was concluded that residue of sand mining can be used in the production system of peach palm as a component of the substrates for seedling production. Its maximum ratio must be 75% of the substrate volume, and it has to be always combined with other materials so that the dry density of the final composition is between 500 and 800 kg.m-3.