The Effect of Water and Potassium Supplement on Yield and Lycopene Content of Processing Tomato

Effects of Irrigation-Fertilization and Irrigation-Mycorrhization on the Alimentary and Nutraceutical Properties of Tomatoes

“…In our research, the scarce influence of K-fertilization on the lycopene biosynthesis, in contrast with other authors (Achilea & Kafkafi, 2003;Helyes et al, 2009;Serio et al, 2007;Zdravkovic et al, 2007;), could be explained with the high natural content of K in the soil, where the tested tomatoes were grown, as reported in materials and methods. On the other hand, this behaviour is in accordance with other authors (Dumas et al, 2003;Panagiotopoulos & Fordham, 1995;), who found a positive response of the lycopene content to fertilization levels only in tomato grown in soil treated with excessively high dose of fertilizers, in contrast to the modern cultural management, whose target is the reduction of the crops chemical input.…”

“…Dry matter was always similar in all the samples of Corbarino genotype, but it decreased in the Vesuviano samples irrigated with the highest water levels, according to Fontes et al (2000) and Helyes et al (2009), who observed a positive effect of K-fertilization at different watering regimes. The pH of both genotypes was not modified by different watering regimes and K-fertilization, according to Ghebbi Si-smail et al (2007), even if Fontes et al (2000) reported a decrease of pH with increasing K-levels.…”

“…Finally, Helyes et al (2009) in an open field experiment, studied the effects of irrigation (regularly irrigated, irrigation cut-off 30 days before harvest, and unirrigated) and two Ksupplementation (454 and 555 kg ha -1 respectively) on lycopene and other analytical parameters of tomato fruit. The high K-rate increased the lycopene content of tomato in the irrigation cut-off and unirrigated treatments.…”

Effects of Lower Nitrogen Concentration of Nutrient Solution Combined with K Supplementation and Changing the Concentration on Growth, Yield, and Yellow-shoulder Disorder for Tomatoes Grown in Extremely Low-volume Substrate

“…NO 3 -N uptake per plant was higher at EC 0.9+P+K (332 me/plant) than at EC 0.9 (285 me/plant), although the NO 3 -N application concentrations were identical, and N content in leaves was found to be greatest at EC 0.9+P+K correspondingly (Table 3). This was caused by P and K supplementation at EC 0.9+P +K enhancing the uptake of NO 3 -N. On the other hand, Zhang et al (2015) reported that the improvement of fruit yield was more likely to depend on P supplementation than K. Therefore, much higher fruit yield comparable to the level at EC 0.9+P+K may be realized by regulating P concentration at a constant level of 5.3 me·L In the literature, it is indicated that YS disorder was reduced by K fertilization in soil (Helyes et al, 2009;Taber et al, 2008) or K supplementation in soilless culture (Zhang et al, 2015). In the present research, when K concentration was increased from 2 me·L −1 (EC 0.6) to 3 me·L −1 (EC 0.6+KNO 3 ), average uptake of K increased correspondingly (data not shown).…”

Influence of Nutrient Concentration and Composition on the Growth, Uptake Patterns of Nutrient Elements and Fruit Coloring Disorder for Tomatoes Grown in Extremely Low-volume Substrate

“…84 (1): 37-45. 2015. carotenoids in tomato, especially lycopene (Helyes et al, 2009;Ramírez S. et al, 2009;Trudel and Ozbun, 1971). Furthermore, K may be involved in the activities of one or more enzymes, such as phytoene synthase and phytoene desaturase, that synthesize phytoene from geranylgeranyl diphosphate, which is the first committed step in the carotenoid biosynthetic pathway (Taber et al, 2008).…”