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- Title
Sunflower performance influenced by water suppression management.
- Authors
Seabra Filho, Marconi; Silva Menezes, Ademir; Rodrigues de Sousa, Paulo Gleisson; Pinheiro Neto, Luis Gonzaga; de Azevedo, Benito Moreira; de Araújo Viana, Thalis Vinicius
- Abstract
Sunflower (Helianthus annuus L.) stands out as the oilseed crop with the largest expansion in the world. Thus, the objective of this study was to evaluate the most appropriate moment to suppress irrigation, without hampering the productive and quality aspects of sunflower culture. A randomized experimental design was used with six treatments and four replicates. The treatments consisted on full irrigation of the crop until different days after sowing. Thus, the different times and irrigation doses applied were 45 days and 225.05 mm; 52 days and 290.78 mm; 59 days and 354.83 mm; 66 days and 417.04 mm; 73 days and 480.96 mm; and 80 days and 528.87 mm. At 90 days after sowing, mass of 1000 seeds, productivity, dry mass of the chapter and stem, oil content of the seed and water use efficiency (WUE) in the production of seed and oil were analyzed. For the 1000 seed mass variable, a significant effect (p <0.05) of suppression irrigation time was observed according the ANOVA, in which the linear model stood out with the highest R² . The sunflower productivity was 2,370.30 kg ha-1 after 80 days after sowing of suppression of irrigation. The minimum WUE was estimated at 3.57 kg ha-1 mm-1, which is related to the 71.92-day irrigation suppression, with an accumulated irrigation depth of 475.45 mm, estimated by regression. The maximum WUE observed value was 8.46 kg ha-1 mm-1 . From the results obtained in the experiment, it was possible to conclude that, when irrigation suppression occurs at any stage of the sunflower cycle, all components of crop production tend to be inhibited. The crop has the maximum WUE at irrigation suppression on day 45 after sowing, therefore, contributing to a lower water consumption.
- Subjects
WATER management; WATER efficiency; COMMON sunflower; WATER consumption; SUNFLOWERS; AGRICULTURAL productivity; DEFICIT irrigation; IRRIGATION
- Publication
Agricultural Engineering International: CIGR Journal, 2021, Vol 23, Issue 4, p31
- ISSN
1682-1130
- Publication type
Article