Produção de mudas de espécies florestais da caatinga em diferentes substratos.

Abstract

Caatinga forest species have great responsibllity for ecosystem maintenance and Brazílian semiarid region population incomel however deforestation and ülres are made se irrational for openlng up áreas for cultivation, pasture production and firewood exploitation. This has resulted in soil degradation and biodiversity loss in semíarid region. An alternative that can help in degraded restoration áreas in the Caatinga is the production species seedlings of Biome, with greater resistance to transplanting and field conditions. The study aimed to evaluate and recommend substrates for production of seedlings of four forest species occurring in the Caatinga, with potential for restoration of degraded áreas. Because of the economic and environmental potential in region and ecological succession in degraded áreas restoration, species studied were: angico - .4nadenanfhera co/uórfna (Vell.) Brenan, pau-ferro - l-/l)/d/ó/a férrea (Maré. ex Tul.) L.P.Queiroz, jurema.preta : M/mofa fenulã7ora (Willd.) Poir and catingueira - soir?c/ane//a pyram/da//s (Tul.) L.P.Queiroz. In this study, each species corresponded to an experiment arranged.D a completely randomized design with four treatments and four replications. The substrates evaluated were composed of soil, soil + caule manure + sand + rice hullsl solo + sheep manure + sand + rice hulls and commercial substrate. The growth parameters evaluated were plant height, stem diameter, fresh shoot weight and root, short dry weight and root and total dry matter, and quality índices: relative plant height / diameter ratio, relative plant height / Dry weight of shoot, dry weight ratio of shoot / root dry mass, and the Dickson quality index.The substrate consists of soir is indicated for angico, pau-ferro and catingueira seedling production, while for jurema seedlings production recommended substrate composed soir, caule manure, sand and ride hulls.