Resumo

SOUZA, Adilson Pacheco de; SILVA, Andréa Carvalho da; PIZZATTO, Mariana  e  SOUZA, ManoelEuzébio de. Thermal Requirements and Productivity of Squash (Cucurbita moschataDuch.) in the Cerrado-Amazon Transition. Agrociencia Uruguay [online]. 2017, vol.21, n.2, pp.15-22. ISSN 1510-0839.

The thermal requirements for the phenological stages of squash cv. ‘Menina Brasileira Precoce’ were evaluated. Theexperiment was conducted in a Red-Yellow Dystrophic Oxil soil and Tropical Climate (Aw), with six winter/spring planting dates(June 5, 15, 25 and July 5, 15 and 25, 2013). The determination of accumulated degree days (GDD) was given consideringthe minimum and maximum basal temperatures of 12 and 35 °C. The average duration of phenological stages were 6.4, 29.2,48.2, 60.9, 63.0 and 69.6 days, with demands for thermal time of 88.2; 401.9; 661.5; 832.5; 858.6 and 985.5 GDD for phasesto emergence, emission of first male button and first female button, first male flower and first female flower and early harvest. Theproportion of female/male flowers ranged from 1:8.4 to 1:18.1. The smaller proportions of female/male flower provided a lowernumber of fruits per plant and productivity. The timing of fruit harvest should be set when fruit development reaches 100 GDD(8.0 days after the female flower emission).

Palavras-chave : Curcubita moschata; degree days; flowering; phenology.

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