Seedlings Quality of Bertholletia Excelsa Bonpl. (Lecythidaceae) Produced in Forest Nursery

Abstract

In this study, the quality of Bertholletia excelsa seedlings was evaluated in relation to the transplanted seedling's size. Thirty days after transplanting the seedlings to the forest nursery, the first height measurement was performed. From the 30 th day onwards, evaluations were carried out every 15 days, being nine in total. The Dickson Quality Index (DQI) was evaluated to determine the seedlings quality, where all seedlings had their root pruned. The experimental design, totaling 160 individuals, was completely randomized with four treatments and four replications, including the shoot cut and three seedling sizes with no shoot cut. Shoot cut seedlings presented a DQI of 0.66 ± 0.23, significantly higher than the large seedlings (≤ 17 cm in height) with no shoot cut (F 3,76 = 2.762, p = 0.047). Transplanting had significant effects over the development, growth, and quality of Bertholletia excelsa seedlings during the first 165 days of seedling production. Therefore, shoot pruning resulted in better performance of B. excelsa seedlings to be planted in the field.

Initial growth and quality of jussara palm seedlings cultivated in biosolid-based substrates

“…For height of aerial part/collar diameter rate, there was an increment according to increasing biosolid proportions in the substrate, with highest mean obtained from the 100% biosolid treatment (Figure 2A). Such relation comprises a non-destructive method to evaluate balance between seedling growth and quality (Grossnickle & Macdonald, 2018;Schwartz, Rocha, Almeida, Dionisio, & Corvera, 2022) so there is a need for an appropriate seedling development to decrease plant fall risks after plating in the field (Dionísio, Schwartz, Almeida, Rocha, & Corvera, 2021). Ferreira et al (2021) verified greatest mean increment for this characteristic when palm seedlings of Archontophoenix cunninghamiana were cultivated in 55% biosolid proportion in the commercial substrate Carolina Soil ® .…”

Emergence and initial growth of Schizolobium parahyba var. amazonicum as a function of sowing depth in the amazon biome

“…The variables were: collar diameter (CD) determined with a digital paquimeter, number of leaves (NL) from the count of normal leaves in the seedling, and height (H) determined from the base to the apical bud, aided by a millimeter ruler. The slenderness degree, also known as the height/diameter ratio was obtained through the relationship between aerial part height (cm) and collar diameter (mm) (Schwartz et al, 2022).…”