Crescimento e qualidade de mudas de baru em reposta a hidroretentor e água magnetizada

The objective of this work was to verify the influence of the association between doses of hydro retentor and types of irrigation water on the growth and quality of these seedlings. The experimental design used was a randomized 5x2x5 block, with 5 replications, with 5 doses of hydro retentor (0, 2, 4, 6, 8 g L-1 - DH), 2 irrigation waters (normal - AN and magnetized - AM) and 5 evaluation periods (15, 30, 45, 60, 75 and 90 days after emergency - DAE). The experimental unit was composed of 4 seedlings, grown on a commercial substrate under tubes of 120 cm³ of capacity. Growth was evaluated by morphological characteristics (plant height - AP, stem diameter - DC and number of leaves - NC, every two weeks) and by dry matter production (root, stem and leaf dry matter at 90 DAE). Dry matter was used to estimate dry matter ratios. Quality was determined by the Dickson Quality Index (IQD). It was observed that the growth in AF and NF were limited, while DC increased linearly with time. The association between DH and AM reduces AP, but compensates for NF. The non-difference observed in dry matter, dry matter ratio and IQD were attributed to the baru's phenotypic plasticity. DH above 0.78 g L-1 do not significantly influence the root system due to the limitation of the 120 cm³ tube.