Desempenho agronômico de genótipos de alface americana no Submédio do Vale do São Francisco

Abstract

Agronomic performance of crisphead lettuce genotypes at Sub-Middle São Francisco ValleyAmong the types of lettuce currently cultivated, crisphead lettuce has exceeded, which aims to serve mainly the networks of fast food. In order to evaluate the productive behavior of lettuce cultivars in Sub-Middle of São Francisco Valley, Pernambuco State, Brazil, two experiments were carried out, in 2013 and 2014. Randomized blocks with twelve genotypes in 2013 and twenty-two genotypes in 2014, with three replications, were evaluated. Total and commercial production per plant; total and commercial productivity; circumference of the commercial "head" and stem length in each year of cultivation were obtained. On both experiments the cultivars were evaluated through joint analysis. For the 2013 crop, total production and productivity showed significant differences between treatments, wherein Havassu (940 g/plant and 78.3 t/ha), Perovana (922 g/plant and 76.8 t/ha), Laurel (903 g/plant and 75.2 t/ha) and Balsamo (875 g/ plant and 72.8 t/ha) were the genotypes that exceeded. In 2014, fresh mass and total productivity ranged between 526 and 816 g/plant and 43.8 and 67.9 t/ha, Laurel (816 g/plant and 67.9 t/ha) and Silvana (809 g/plant and 67.4 t/ha) presenting the best results, with no difference among them. For joint analysis, every evaluated characteristic was significantly affected by the interaction between the factors, year and cultivars. We concluded that the cultivation of crisphead lettuce is viable in the region. The cultivars Ironwood, Havassu, Laurel, Flora, Perovana, Raider Plus, Balsamo and Silvana are the most indicated.

Growth and production of crisphead lettuce cultivars in protected cultivation and high temperatures

“…These values are higher than what was observed for crisphead lettuce cultivars in Carcéres-MT, where yield indexes ranged from 15 to 27 t ha -1 with an average temperature of 29 °C (Neves et al, 2016) were verified. Meanwhile, Yuri et al (2017) found values above 40 t ha-1 in the region of Petrolina-PE, with an average temperature of 22 °C, with these results being higher than the ones from this research.…”

“…The cultivar with the highest total fresh matter accumulation was Balsamo under chromatinet ® net with a mean value of 409.50 g plant -1 , and this same genotype had a 48% reduction in this variable when grown under full sun. Yuri et al (2017), for this same variety, observed values of 875 g plant -1 in the same region of the present research; probably the difference is due to the production periods of that study, which had mild temperatures, while this present research was conducted in high temperatures.…”

“…Demand in the Brazilian market is for two types of crisphead lettuces: one type with a compact "head" for minimal processing, in which the lettuce is washed, chopped, sanitized and packaged (industry), directed mainly to large supermarket chains or snack bars; and the other one with a less compact "head" formation, for sale in markets and fairs (Yuri et al, 2017).…”

“…After estimating the irrigation depth based on the tensiometers readings, it was applied via a micro-sprinkling system, with 13 emitters per bed and a flow rate of 10 L.h -1 per emitter. For phytosanitary and weed control, the treatments used were the ones that are commonly employed in the crop, according to Yuri et al (2017).…”

Resposta De Cultivares De Alface Sob Diferentes Lâminas De Irrigação E Doses De Nitrogênio

“…A alfacicultura em muitas regiões é prejudicada devido às intempéries do clima, o que pode reduzir a oferta do produto afetando a regularidade de oferta do produto durante todo o período do ano, assim o cultivo protegido é uma importante alternativa que pode garantir a oferta do produto quando as variações climáticas não favorecem o cultivo convencional (VALERIANO et al, 2016). A alta sensibilidade as condições adversas de temperatura, umidade e precipitação são consideradas a principal limitação desta cultura (YURI et al, 2017).…”