EFFECTS OF COPPER ON GROWTH AND QUALITY OF Stryphnodendron polyphyllum Mar. AND Cassia multijuga Rich.

Abstract

A contamina\ue7\ue3o do solo com cobre tem se tornado comum em regi\uf5es de minera\ue7\ue3o e agr\uedcolas pelo uso de fungicidas a base de cobre e aplica\ue7\ue3o de dejeto l\uedquido de su\uedno ao solo, causando redu\ue7\ue3o na produtividade das plantas. O trabalho objetivou determinar o efeito de doses de cobre no crescimento e qualidade de mudas de Barbatim\ue3o ( Stryphnodendron polyphyllum Mart.) e C\ue1ssia ( Cassia multijuga Rich.). O delineamento experimental foi inteiramente casualizado num fatorial (2 x 4), sendo as duas esp\ue9cies florestais, e quatro doses de cobre: 0; 150; 300 e 450 mg kg-1, com 10 repeti\ue7\uf5es. Avaliou-se a altura de planta, di\ue2metro do colo, peso da mat\ue9ria seca radicular e da parte a\ue9rea, comprimento e \ue1rea superficial espec\uedfica radicular, e os \uedndices de qualidade de mudas: rela\ue7\ue3o entre altura da parte a\ue9rea e di\ue2metro do coleto; altura da parte a\ue9rea e peso da mat\ue9ria seca da parte a\ue9rea e o \ucdndice de Qualidade de Dickson. Os resultados demonstram que as doses de cobre testadas n\ue3o influenciam a qualidade de mudas da C\ue1ssia enquanto o Barbatim\ue3o mant\ue9m a qualidade de mudas at\ue9 300 mg kg-1 de cobre adicionado ao solo. O Barbatim\ue3o apresenta maior crescimento e qualidade de mudas que a C\ue1ssia em solo contaminado com cobre.Soil contamination with copper has become common in the mining and agricultural regions by the use of copper-based-fungicide and application of liquid swine slurry to the soil, causing a reduction in plant productivity. Therefore, a study was undertaken to determine the effect of copper doses in growth and quality of Barbatim\ue3o ( Stryphnodendron polyphyllum Mart.) and Cassia ( Cassia multijuga Rich.) seedlings. The experimental design was completely randomized in a factorial (2 x 4) being the two forest species and four doses of copper: 0, 150, 300 and 450 mg kg-1, with 10 repetitions. It was evaluated plant height, stem diameter, dry weight of shoot and root length and specific root surface area, and the quality indexes of seedlings: relationship between shoot height and diameter of the collar; height and shoot dry weight of shoots and Dickson Quality Index. The results revealed that the copper doses tested does not change the quality of seedlings of Cassia and that Barbatim\ue3o maintains the quality of seedlings up to 300 mg kg-1 of copper added to soil. Barbatim\ue3o presents greater growth and quality than Cassia seedlings in soil contaminated with copper