Journal of Food, Agriculture and Environment

Vol 12, Issue 3&4,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Thermic sum and crop coefficient of canola (Brassica napus L.) for the region of Tangará da Serra, Mato Grosso State, Brazil


Kássio De Marco 1, Rivanildo Dallacort 1*, Adalberto Santi 1, Ricardo Shigueru Okumura 2, Mirian Hiroko Inoue 1, João Danilo Barbieri 1, Dejânia Vieira de Araujo 1, Roberto Antônio Savelli Martinez 1, Willian Fenner 1

Recieved Date: 2014-04-30, Accepted Date: 2014-09-16


The canola cultivation is highly dependent on water resources, which makes it necessary to conduct studies to determine the crop coefficient (Kc), with the purpose of improving the efficiency of water use. Thus, the objective of this study was to determine the Kc and calculate the thermic sum required to complete its development cycle. The experiment was conducted at the University of the State of Mato Grosso - UNEMAT Campus of Tangará da Serra, Brazil, in the period of February 20th 2013 to May 25th 2013, in which the hybrids Hyola-433 and Hyola-61 were sown. To determine the reference evapotranspiration (ETo), the Penmam - Monteith method was used, while the crop evapotranspiration (ETc) was determined using drainage lysimeters, and the Kc obtained by the relation between ETc and ETo. In calculating the thermic sum, base temperatures were used, determined in the literature for each cultivar. The ETc had a mean of 4.50 mm day-1 for the hybrid Hyola-433 and 3.38 mm day-1 for the hybrid Hyola-61, the ETo had an average of 3.14 mm day-1 and the Kc of the hybrid Hyola-433 was 1.09; 2.15 and 1.43, while the hybrid Hyola-61 showed 0.79; 1.65 and 1.33 in the vegetative growth, flowering and maturity stages, respectively. During its growing cycle the hybrids and Hyola-61 and Hyola-433 required a thermic sum of 1,778 and 1,816 degree days, respectively.


Degree day, evapotranspiration, plant development

Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 3&4
Category: Agriculture
Pages: 232-236

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