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Os biossólidos têm sido estudados como fonte de matéria orgânica na agricultura. Objetivou-se avaliar o desenvolvimento de mudas de Acacia mangium e Acacia auriculiformis em diferentes substratos: a) horizonte Bw com areia lavada (1:1, v:v) e adubação mineral de 160, 640 e 160 g m-3de N, P2O5 e K2O, respectivamente (HB); b) horizonte Bw com areia lavada e esterco bovino (1:1:1, v:v) (HBE); c) horizonte Bw com areia lavada e lodo de esgoto (1:1:1, v:v) (HBL); e d) 100% de lodo de esgoto (LE). Aplicou-se 1 kg de CaCO3 p.a. por m³ de substrato. Foram utilizadas sementes inoculadas com rizóbio e não-inoculadas, determinando-se, aos 90 dias após a semeadura, a altura das plantas, o diâmetro do colo e o peso da matéria seca da raiz e da parte aérea, na qual se determinaram N, P, K, Ca e Mg. O delineamento estatístico foi inteiramente casualizado, no esquema fatorial 2 x 4 (com ou sem inoculação x 4 substratos). No LE com inoculação, obteve-se melhor crescimento das mudas. O HBE produziu efeito superior no desenvolvimento das mudas em relação àquele com a mesma proporção de material orgânico na forma de lodo (HBL). Na maioria dos parâmetros avaliados não houve diferença devido à inoculação dos substratos HBE, HBL e HB, provavelmente devido à existência de bactérias nativas nesses substratos. As mudas desenvolvidas no substrato LE foram as que acumularam mais N e Ca, principalmente quando inoculadas. Houve tendência de maior acúmulo de P, K e Mg na parte aérea das mudas desenvolvidas no substrato HBE.

Sewage sludge has been studied as source of organic matter on seedling production. Thus, this study aimed to evaluate the development of Acacia mangium and Acacia auriculiformis seedlings in the following substrates: a) oxic horizon + sand (1:1, v:v) + 160, 640 e 160 g m-3 of N, P2O5 and K2O respectively (HB); b) oxic horizon + sand + cattle manure (1:1:1, v:v) (HBE); c) oxic horizon + sand + sewage sludge (1:1:1, v:v) (HBL) and; d) 100% sewage sludge (LE). The substrates were limed with 1 kg m-3CaCO3 p.a.. Seeds, inoculated and non-inoculated with Rhizobium, were used, and 90 days after planting, measures of collar diameter, plant height, and root and shoot dry matter (with determination of N, P, K, Ca and Mg) were taken. The experimental design was completely randomized blocks, in a factorial 2 x 4 arrangement (with or without inoculation x 4 substrates). Better performance in seedling growth was obtained in the LE substrate with inoculated seeds. Comparatively, the HBE substrate was superior to the HBL substrate. There were no significant differences for most evaluated parameters in the HBE, HBL and HB substrates due to inoculation, probably because the existence of native bacteria in these substrates. The seedlings developing in the LE substrate accumulated more N and Ca, mainly when inoculated. There was a tendency of larger P, K and Mg accumulation in shoots of seedlings developing in the HBE substrate.

Index code	Element
ti	article title
au	author
kw	article keywords
subject	subject (title words, abstract and keywords)
ab	abstract
ta	journal short title (e.g. Cad. Saúde Pública)
journal_title	journal full title (e.g. Cadernos de Saúde Pública)
la	publication language code (e.g. pt - Portuguese, es - Spanish)
type	document type
pid	publication identifier
publication_year	publication year of publication
sponsor	sponsor
aff_country	country code of the author's affiliation
aff_institution	author affiliation institution
volume	article volume
issue	article issue
elocation	elocation
doi	DOI number
issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

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