Abstract
In regions with high temperatures, carrot cultivation is impracticable, as high temperatures tend to reduce yield and quality of the product. However, with the advent of summer cultivars, carrot cultivation in these regions has become viable. The aim of this work was to evaluate the performance of ten carrot cultivars in different planting seasons. The experiments were carried out at the Rafael Fernandes Experimental Farm of the Federal Rural Semiarid University (UFERSA). The experiments were carried out in May, June, July and August of 2017. The experimental design was a randomized block with ten treatments and four repetitions. The characteristics that were evaluated were the root classification (long, average and short roots); commercial, non-commercial and total yield; dry plant weight and root fresh weight. Both the planting season and the cultivar played important roles in agronomic performance throughout the experimental period. In May and June, the highest average yields and plant growth were obtained (43 and 45 t ha-1 yield, respectively). Hybrid cultivars showed better performance than open-pollinated cultivars in terms of yield. The Brasília, BRS Planalto, and Kuronan varieties showed poor performance in all the evaluated characteristics.
Highlights
Temperatures affect carrot crops throughout their life cycles
To overcome the limitations imposed by high temperatures, Brazilian researchers have developed cultivars with good performance in the temperature range of 18 to 25°C
The highest plant heights were observed in the cultivations carried out in May and June
Summary
Temperatures affect carrot crops throughout their life cycles. Temperatures above 30°C may induce a shortened vegetative cycle, affecting root development and yield. The ambient temperature is an important deciding factor in the choice of cultivar to be cultivated in different regions and climates (Seljasen et al, 2013). To overcome the limitations imposed by high temperatures, Brazilian researchers have developed cultivars with good performance in the temperature range of 18 to 25°C. The new varieties show resistance to diseases caused by fungi and nematodes in addition to having good climate adaptability. This has made planting carrots in regions and states where temperatures are higher, such as Bahia and Goiás, possible (Silva, Vieira, & Nascimento, 2011). The use of summer cultivars and the use of seeds from the primary umbel has been the main strategy for enabling carrot cultivation in regions where this vegetable was not cultivated before (Resende et al, 2016; Nascimento, 2000)
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