Produção de cultivares de tomateiro em hidroponia e fertirrigação sob razões de nitrogênio e potássio

Abstract

Production of tomato cultivars in hydroponics and fertigation with different ratios between nitrogen and potassium Protected tomato cultivation presents a high potassium demand for obtaining high fruit yield and quality, but the ratio between nitrogen and potassium supplies which provides such results has not been sufficiently evaluated. The fruit yield and quality of four tomato cultivars were evaluated in hydroponics and fertigation systems at two ratios between N and K provided to the plants. Two

Potassium fertilization via fertigation and conventional application on quality of tomato fruits

“…Results contrary to those of the present study were reported by Blanco & Folegatti (2008), who studied K fertilization in the tomato crop, and by Genúncio et al (2010), who tested different K concentrations in the tomato crop in hydroponic and fertigated systems.…”

Potassium fertilizer applied by different methods in the zucchini crop

“…Similar to the result of the present study, Genuncio et al (2010), in an experiment with the tomato crop, also observed that the supply of K 2 O did not influence the content of soluble solids of the fruits. These authors claim that the effects of K supply on sensorial and fruit quality parameters may vary in response to the different environmental conditions, as well as to the amplitude of the evaluated K 2 O doses, which corroborates the results of Araújo et al (2012), who also did not observe significant effect of K dose on fruit length or number of fruits of squash (hybrid 'Mirian').…”

Organic compost addition to raw rice husk substrate for tomato (<i>Solanum lycopersicum</i>) hybrid variety cultivation in a leach recirculating system

“…Different responses among varieties for these variables were also not observed, except for total soluble solid contents (TSS): the variety Sheila Victoria, with 5.0 °Brix, was superior to Sophya (4.5 °Brix) and Lumi (4.6 °Brix) varieties, without differing from the Ivety (4.8 °Brix) variety. The responses resemble those of Genuncio et al (2010), who observed that only TSS statistically differed among the evaluated fruit production variables of three beefsteak tomato varieties. According to Alvarenga (2013), the TSS contents of fresh tomatoes usually remain between 3.0 and 4.5 °Brix.…”

“…However, the marketable yield may be considered quite high, ranging from 6.3 kg/plant (248.2 t ha -1 ) for the Sophya and Sheila Victoria varieties, 6.5 kg/plant (256.1 t ha -1 ) for the Lumi variety, to 7.6 kg/plant (299.4 t ha -1 ) for the Ivety variety. Other studies using soilless cultivation systems reported a production of 3.3 kg/plant for both the Monte Carlo variety grown in organic substrate (Plantmax ® Company, Brazil) (Rattin et al, 2003) and the Santa Clara variety grown in a hydroponic system (Genuncio et al, 2010). Lima et al (2011) obtained a fruit yield of 5.7 kg/plant for the Venus variety grown in a coconut fiber substrate.…”

“…It reduces the occurrence of soil pathogens, enables the reduction of pesticide applications, increases the efficient use of inputs, and provides more stable harvests (Genuncio et al, 2010;Lúcio et al, 2012).…”