Produção de minitubérculos básicos de batata em três sistemas hidropônicos

Abstract

Potato basic minitubers production in three hydroponic systemsThe objective of this work was to evaluate the production of potato basic minitubers in three hydroponic systems: aeroponic, DFT (deep flow technique) and NFT (nutrient film technique), using cultivars Agata and Monalisa. The experiment was carried out under protected cultivation, from May to September, 2005, in Jaboticabal, São Paulo State, Brazil, in a completely randomized block design, with split-plots. The hydroponic systems were assigned to the experimental plots, whereas cultivars were assigned to sub-plots. Tuber fresh weight and longitudinal diameter were not influenced by the hydroponic systems, with average values of 6,2 g and 30,2 mm, 6,3 g and 30,0 mm, 6,8 g and 31,0 mm, for hydroponic systems NFT, DFT and aeroponic, respectively. Between cultivars, Monalisa presented larger longitudinal diameter and fresh mass (32,2 mm and 7,1 g), significantly superior when compared to Agata (28,6 mm and 5,8 g). Minituber yield per plant and m 2 was significantly higher in the aeroponic system (49,3 e 874,4) in comparison the NFT (39,5 e 246,6) and DFT systems (41,6 e 458,0), respectively. Results indicate that basic potato minitubers can be efficiently produced using the hydroponic systems evaluated in this work. Among them, the aeroponic system presented the best results.

Electrical conductivity of the nutrient solution and plant density in aeroponic production of seed potato under tropical conditions (winter/spring)

“…The results for NMP obtained in this study are higher than those reported by Tierno et al (2014), 12.5 NMP for the cultivar Monalisa, and lower than those observed by Factor et al (2007), 40.3 and 46.6 NMP for ' Ágata' and Asterix cultivars, respectively, both in aeroponics system. It is noteworthy, however, that the aeroponics system of this research is larger than the prototype described by Factor et al (2007) and, therefore, closer to the commercial systems used and feasible to be adopted by the productive sector without many adaptations.…”

“…The aeroponics system adopted was initially described by Factor et al (2007), but adapted for commercial production conditions, according to Calori et al (2014) (Figures 1,2). The system was installed inside a greenhouse The Ágata and Asterix cultivars were used because the tuber shape and skin color are different, facilitating the harvesting and separation in aeroponics, being among the main genotypes currently grown in the , NH 4 + , P, K, Ca, Mg, S, Fe, Zn, Mn, B, Cu, and Mo, respectively, and EC of approximately 2.0 dS•m −1 .…”

“…In contrast, the aeroponics system stands out since it can achieve yields of up to 49 minitubers per plant, besides the repeated harvesting of tubers, which facilitates the standardization and marketing planning (Ritter et al 2001;Factor et al 2007;Otazú 2010).…”

Seed-potato production through sprouts and field multiplication and cultivar performance in organic system

“…The average diameter of tubers was 3.7 cm, a result close but lightly superior from those from Factor et al (2007): 3.0 cm, recorded for sprouts planted in a hydroponic system. On the present work, an average of 3.0 tubers were produced per plant, an amount inferior of that observed by Silva et al (2006): 4.4 tubers per plant grown on different substrate soil mix under protected cultivation system.…”

Monitoring, calibration and maintenance of optimized nutrient solutions in curly lettuce (Lactuca sativa, L.) hydroponic cultivation

“…According to Factor (2007), the hydroponic system can be classified as open (after application, the nutrient solution is not reused) or closed (the nutrient solution is recovered, replenished and recycled). In the hydroponic cultivation, roots received a balanced nutrient solution that contains water and all nutrients necessary for plant development (Barbieri et al, 2010).…”