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Ingeniería agrícola y biosistemas
versão On-line ISSN 2007-4026versão impressa ISSN 2007-3925
Resumo
INZUNZA-IBARRA, Marco Antonio et al. Soil moisture depletion rates on sunflower yield. Ing. agric. biosist. [online]. 2022, vol.14, n.1, pp.51-63. Epub 24-Out-2022. ISSN 2007-4026. https://doi.org/10.5154/r.inagbi.2021.09.105.
Introduction:
Optimizing the irrigation water resource is essential due to its scarcity, so it is therefore important to consider efficient crops such as sunflower.
Objective:
To estimate the sunflower grain yield at different levels of available soil moisture depletion to estimate water use efficiency (WUE) of the crop under different water conditions.
Methodology:
Seven treatments resulting from four soil moisture levels (40, 60, 80 and 100 % of available soil moisture [ASM]) and two periods of sunflower growth (from emergence to the beginning of flowering [first stage] and from flowering to physiological maturity [second stage]).
Results:
The highest grain yield (5.5 t·ha-1) and WUE of (0.922 kg·m-3) were recorded in the 60-60 % ASM treatment in the first and second stages of sunflower development, and by consuming 62.8 cm of water.
Limitations of the study:
The results should not be extrapolated to conditions outside the study levels.
Originality:
To generate research methodologies to quantify, in a more realistic way, the relationship of yields with crop water requirements.
Conclusions:
The highest WUE in sunflower (0.922 kg·m-3) was recorded when it consumed 31.4 and 28.12 cm of water, with 58.8 and 60.5 % of ASM in the first and second stages, respectively, which was similar to the 60-60 % treatment.
Palavras-chave : Helianthus annuus L.; water efficiency; evapotranspiration; water production function.