Abstract
Eucalyptus has great importance in the forestry sector and many advances in the area of improvement have been achieved with the advent of biotechnological techniques. However, some promising genotypes still do not have multiplication protocols with cloning techniques, such as minicutting. The study aimed to evaluate IBA concentrations for survival, rooting and vegetative vigor of E. benthamii x E. dunnii minicuttings, and determine the maximum technical efficiency dose. Ministumps H12, H19 and H20 clones were cultivated in a clonal minigarden under a semi-hydroponic system. For rooting, the minicutting basal portion was plunged in hydro-alcoholic solutions, whose concentrations were: 0; 2,000; 4,000; 6,000 and 8,000 mg L-1 of IBA. The experiment was conducted in a completely randomized design, with the factors consisting of three clones and five IBA concentrations, with five replications, containing 10 minicuttings per replication. IBA positively influenced the minicutting rooting processes, with differentiated behavior between the clones, with 30.32 to 55.45% rooting variation. The positives increments occurred until the highest IBA concentration for H12 and H19 clones. However, the range between 4,000 and 6,000 mg L-1 of IBA treatments promoted the best rooting results for the H20 clone.
Highlights
As regiões Sul e Sudeste do Brasil formam o maior pólo consumidor e exportador de madeira oriunda de plantios florestais
Aplicação de IBA para o enraizamento de miniestacas em todos os meses do ano e temperatura do mês mais quente inferior a 22°C, mas no mínimo quatro meses com temperatura maior que 10°C
A análise química da água apresentou as seguintes características: 1,4 mg L-1 de N-NO3, 0,4 mg L-1 de N-NH4, 0,93 mg L-1 de P, 1,44 mg L-1 de K, 26,08 mg L-1 de Ca, 5,07 mg L-1 de Mg, 0,4 mg L-1 de Cu, 0,09 mg L-1 de Fe, 0,04 mg L-1 de Mn e 0,04 mg L-1 de Zn
Summary
O trabalho foi conduzido de junho a agosto de 2007, no Laboratório de Propagação de Plantas da Embrapa Florestas - CNPF, situada em Colombo, Estado do Paraná (25°20’ S e 49°14’ W, 950 m). Aplicação de IBA para o enraizamento de miniestacas em todos os meses do ano e temperatura do mês mais quente inferior a 22°C, mas no mínimo quatro meses com temperatura maior que 10°C
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