The electrical conductivity of the nutrient solution directly affects production and quality of the plants. We evaluated the electrical conductivity suitable for soilless cultivation of kohlrabi. The experiment was carried out in a completely randomized design, with four replicates and five treatments, composed of different nutrient solution’s conductivities (1.31, 1.71, 2.37, 2.98 and 3.75 dS m-1). We evaluated number of leaves, leaf area, specific leaf area, leaf area ratio, fresh and dry masses of leaves, bulb, roots and total, bulb volume, water content in the bulbs and pH, soluble solids, vitamin C, firmness, titratable acidity and SS/TA ratio of the bulbs. All variables related to growth were affected by the nutrient solutions, showing the highest values with the use of the nutrient solutions with EC close to 2.0 dS m-1. Considering the commercial part of the plant, the most developed bulbs were obtained with EC of 1.96 dS m-1, being 49.9 g and 41.15 cm3 per bulb. On the other hand, except for pH, the other variables responded to the increase of EC. Higher values for pulp firmness and titratable acidity occurred with EC close to 2.0 dS m-1, whereas the other variables showed higher values using a more concentrated nutrient solution.
This study aimed to evaluate lettuce production in different pot volumes and different irrigation frequency under saline stress. The experiment was carried out at the Department of Environmental and Technological Sciences of the Federal Rural University of the Semi-Arid, in Mossoró, RN, Brazil. Randomized block experimental design was used in factorial scheme of 2 × 3 × 3, with 3 replicates. Treatments were consisted of 2 water’s salinity levels (0.5 and 2.0 dS m-1), 3 frequencies of irrigation (6, 9, and 12 daily events), and 3 different pots (0.5, 1.0, and 3.0 L). Data from parameters evaluated at harvest were submitted to variance analysis and means were compared. We verified that when the lower saline water (0.5 dS m-1) was used lettuce production increased when cultivated in pots of 3.0 L and submitted to 6 daily events of irrigation. When 3.0 dS m-1 water was used the best results were obtained in 0.5 L and nine daily events of irrigation. The combination of 0.5 L pot and six or nine daily events of irrigation better inhibited the damaging effects of salinity.
The objective of this study was to evaluate the effect of a plant growth regulator (PGR; Stimulate®) on the yield and quality of zucchini fruits from plants of the cultivar Caserta-Italiana grown under different salinity levels of the irrigation water (SLIW). A randomized block design was used, in a 2 × 6 factorial arrangement consisted of two SLIW (0.5 and 5.0 dS m-1) and six PGR application modes: imbibition of seeds for 8 h in distilled water (PGR-T1; Control); imbibition of seeds for 8 h in PGR at 10 mL L-1 (PGR-T2); imbibition of seeds for 8 h in PGR at 10 mL L-1 plus foliar application at 10 mL L-1 at the flowering stage (PGR-T3); imbibition of seeds for 8 h in PGR at 10 mL L-1 plus two foliar applications at the flowering stage and at 20 and 30 days after sowing (PGR-T4); foliar application at 10 mL L-1 at the flowering stage (PGR-T5); and two foliar applications at 10 mL L-1 at 20 and 30 days after sowing (PGR-T6). The SLIW affected differently the variables of the zucchini crops evaluated. The PGR application to plants under no salt stress (0.5 dS m-1) increased the solid soluble concentration and biomass accumulation of zucchini fruits. The PGR application as seed treatment and foliar application at the flowering stage increased the fruit yield of zucchini plants irrigated with saline water.
Resumo A alface (Lactuca sativa L.) é uma das hortaliças mais consumidas no Brasil e no mundo devido sua grande utilização e importância organoléptica, sendo bastante prejudicada pelo estresse salino, pois, é pouco tolerante. O trabalho foi desenvolvido com o objetivo de avaliar a produção de alface crespa em fibra de coco fertigada com solução nutritiva salina enriquecida com nitrato de cálcio. O experimento foi desenvolvido no período de julho a agosto de 2017, em casa de vegetação, da Universidade Federal Rural do Semi-Árido (UFERSA), em Mossoró, RN. O delineamento experimental utilizado foi o de blocos casualisados, cujos tratamentos foram obtidos pela utilização de alface crespa, cv. Elba, com cinco soluções nutritivas (S1solução nutritiva padrão; S2solução nutritiva padrão salinizada; S3-S2 + 50% de Ca(NO 3) 2 ; S4-S2 + 100% de Ca(NO 3) 2 ; S5-S2 + 150% de Ca(NO 3) 2), contendo três repetições. Cada repetição foi formada por 4 vasos plásticos com capacidade para 3,0 dm 3 , contendo fibra de coco e uma planta em cada vaso. As plantas foram colhidas aos trinta dias após o transplantio e foram analisadas as seguintes variáveis: a) diâmetro da copa; b) diâmetro do caule; c) número de folhas; d) massa fresca; e) área foliar; f) massa seca e g) área foliar específica. O enriquecimento com nitrato de cálcio a partir de 50% na solução nutritiva foi eficiente para reduzir o efeito negativo da salinidade sobre plantas de alface tornando-se economicamente viável para situações que exigem o uso de água salina no cultivo da alface.
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