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- Title
Thermal requirements and estimates of number of leaves of Annona squamosa L. grown under different shading conditions.
- Authors
Alves Gomes, Angélica; Marangon Debastiani, Matheus; Pizzatto, Mariana; Carvalho Da Silva, Andréa; Pacheco De Souza, Adilson
- Abstract
The objective of this study was to determine the thermal requirements and compare methods for estimating leaf emergence in Annona squamosa L. under different shading conditions during the dry and rainy seasons in a transition region between the Cerrado Amazon biomes, Mato Grosso, Brazil. Seedlings were grown under full-sun conditions (reference) and black polyolefin screens with 35%, 50%, 65%, and 80% attenuation of global radiation. Basal temperatures were determined using the method of least standard deviation; accumulated thermal sum was estimated using the method described in Ometto (1981); the relationship between number of leaves and thermal sum were evaluated using the phyllochron and Wang & Engel (1998) models. The minimum and maximum basal temperatures for the growth of A. squamosa were 11.0 and 38.0 °C, respectively. The accumulated thermal sum presented small variation between shading conditions and seasons, resulting in means of 1744±44 and 4434±118 degree-days at 113 and 260 days after transplanting (DAT), corresponding to the end of the dry and rainy seasons, respectively. The thermal requirement for leaf emergence varied among the different shading conditions, with higher phyllochrons under full sun conditions and 80% shading (109.8 °C day leaf-1) and lower phyllochrons under 50% shading (91.74 °C day leaf-1). The phyllochron model presented higher efficiency in estimating leaf emergence compared to the Wang & Engel model. Growing A. squamosa seedlings under 50% shading is recommended as it resulted in higher degree-day accumulation and lower phyllochron for leaf emergence.
- Subjects
MATO Grosso (Brazil : State); BRAZIL; ANNONA; GLOBAL radiation; CERRADOS; SEEDLINGS; STANDARD deviations; BIOMES
- Publication
Comunicata Scientiae, 2023, Vol 14, p1
- ISSN
2176-9079
- Publication type
Article
- DOI
10.14295/CS.v14.3973