Abstract
The sunflower (Helianthus annuus L.) appears as an income alternative to the producers of the northeastern region of Brazil, however limited by the salinity present in the waters of the region, which makes it necessary to select cultivars that are more adaptable to this situation. On this, the objective was assessing the development of two cultivars of cutting ornamental sunflower with waters of different salinities. The experiment was performed in conditions of protected environment at UFCG, CCTA-Pombal-PB. It was performed in outline of blocks in factorial scheme 5 × 2, being five saline levels (N1 = 0.3, supply water; N2 = 1.5; N3 = 2.7; N4 = 3.9; and N5 = 5.1 dS m-1) and two cutting ornamental sunflower cultivars (Red Sun and Vincents II), with four repetitions and two plants by portion, with a total of 80 experimental units. The irrigation water salinity affected all the analyzed variables, up to estimate level of 2.7 dS m-1 acceptable reductions happen of 10% in the inflorescence and stem of cultivars of ornamental sunflower. The Red Sun cultivar when compared with cultivar Vincents II demonstrated better results in the studied variables.
Highlights
The sunflower (Helianthus annuus L.) is a yearly dicotyledonous plant originated in the north American continent that, due to its high adaptation to edafoclimatic conditions has been gaining prominence in the Brazilian agribusiness (Caldeira et al, 2017)
As a way to follow up the development of this sector, it comes as an alternative the cultivation of cutting ornamental sunflower that, besides the high adaptation to the environment conditions, present short cycle and inflorescences lush leading to a high acceptance by consumers, mainly for production of arrangements and decorations (Andrade et al, 2017)
According to the summary of variance analysis (Table 2), it is verified the significative effect in the interaction between electrical conductivity of irrigation water and cultivars of sunflower over the plant absolute growth rate (AGRPH) in the period of 15-60 day after the transplantation (DAT)
Summary
The sunflower (Helianthus annuus L.) is a yearly dicotyledonous plant originated in the north American continent that, due to its high adaptation to edafoclimatic conditions has been gaining prominence in the Brazilian agribusiness (Caldeira et al, 2017) This fact was associated mainly to the most various purposes of cultivation: from grains production to oil extraction and animal feeding, as in the production of cutting flowers and vase (Brito et al, 2017). As a way to follow up the development of this sector, it comes as an alternative the cultivation of cutting ornamental sunflower that, besides the high adaptation to the environment conditions, present short cycle and inflorescences lush leading to a high acceptance by consumers, mainly for production of arrangements and decorations (Andrade et al, 2017) This situation makes these cultivars an alternative to the socioeconomic development of the northeastern region of Brazil. The objective was to assess the development of two cultivars of cutting ornamental sunflower irrigated with waters of different salinities
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