Name: LAÍS GERTRUDES FONTANA SILVA
Publication date: 30/07/2021
Advisor:
Name |
Role |
|---|---|
| SARA DOUSSEAU ARANTES | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| EDILSON ROMAIS SCHMILDT | Internal Examiner * |
| SARA DOUSSEAU ARANTES | Advisor * |
Summary: One of the main limitations that afflicts pineapple growers is the
phenomenon of natural flowering. The use of compounds that act on the
synthesis of hormones is an alternative for management. Thus, the objective
was to evaluate the effect of the concentration of paclobutrazol (PBZ) and the
period of application in the pineapple Vitória. The design was in randomized
blocks in a factorial scheme (3x3+1), with three concentrations (75, 150 and
300 mg L-1) of PBZ and three periods (P1: April-May, P2: May-June and P3:
June-July) and an additional treatment (control). Flowering calculation, plant
development analysis, photosynthetic pigments, carbohydrate allocation, total
nitrogen and fruit physicochemical analysis were performed and the data were
submitted to analysis of variance and Tukey test (p<0.05). All PBZ
concentrations inhibited flowering and there was an increase in inhibition time.
The PBZ at the concentration of 150 and 300 mg L-1
inhibited the natural
flowering in P1 and P2 and 80% in P3. The PBZ induced the development of
leaves in relation to the control, however the effect reduced when increasing the
concentration. Chlorophyll contents were higher with 150 and 300 mg L-1 of
PBZ and were not influenced by the periods. For the carbohydrate contents, the
starch showed a significant difference. Nitrogen was influenced in the apical
and median part of the leaves. The PBZ reduced the fruit mass, and
consequently increased the content of Brix, vitamin C and ratio. Therefore, a
concentration of 75 mg L-1
is recommended in the period from May to June.
