Changes in nutraceutical quality of tomato under different organic substrates

Abstract

Yield and nutraceutical quality of Sahel tomato cultivar under shade net was evaluated using different mixtures of organic substrates in Coahuila, northern Mexico. The treatments consisted of mixtures using sand (S), vermicompost (VC), solarized bovine manure (SB), agricultural soil (AS) and mineralized compost (MC). The treatments were: T1 (S:VC, 80:20), T2 (S:SB, 80:20), T3 (S:SB:AS, 80:15:05), T4 (S:VC:AS, 80:15:05), T5 (S:MC, 80:20), and a control treatment T6 (S, 100%) with Steiner solution. Yield results showed that the best organic treatments were T5 and T4 with 3.48 and 3.33 kg plant-1, respectively; while the highest yield was in control (T6) with 3.71 kg plant-1. The highest phenolic content in the organic treatment of fruits was 56.94 mg equivalent of gallic acid per 100 g in fresh weight for T5, while the treatment with chemical fertilization obtained 49.82. The greatest antioxidant capacity was obtained in T4, with 478.34 μM equivalent of Trolox/100 g fresh weight. Two colors were evaluated (yellow and red) corresponding to two ripeness phases. Lycopene content in tomatoes was in average 32% higher in the red colored fruits than in the yellow ones, with 3.12 and 2.24 mg lycopene 100 g pulp-1 values, respectively. For the red ones, treatment T5 showed the highest value (3.52) and in yellow ones T1 reported 2.35, while T2 presented the lowest values for both colors. Organic fertilizers based on S:VC can induce good amounts of lycopene in fruits of both colors, as well as improve phenols and antiOX.

Nutraceutical Quality and Soluble Solids of Cucumis melo Developed in Vermicompost-River Sand Mixtures, Under Shade Mesh Conditions

“…In general terms, the development of muskmelon crops in mixtures of VC:RS, in different ratios, according to Rajbir et al 43 favoured the production of fruits with better quality parameters. Similar effects were determined by Fortis-Hernández et al 44 for tomato fruits, grown under shade house conditions. These authors concluded that organic fertilizers based on the sand-vermicompost mixture (80:20 by percent) increased the phenols content and antioxidant capacity of the crop.…”

Yield Response and Antioxidant Activity of Greenhouse Organic Pumpkin (Cucurbita moschata Duch.) as Affected by Soil Solarization and Biofumigation

“…The effect of solarization was evident in our study: in the literature, some reports were available on the possible effects of soil solarization treatment, alone or combined, to improve crop performance and plant nutritional and nutraceutical quality [43,44]. Fortis-Hernández and coworkers [45] studied the effects of different organic substrates, among which solarized bovine manure, on phytochemical features of Solanum lycopersicum L.; the authors reported that some of these treatments, mainly based on compost, induced a good antioxidant capacity. These data highlighted that several chemical substances, such as phenols, seem to be related to the production of antioxidants, which a plant can produce as defense method, in responding to oxidation stress.…”

ESTABILIZACIÓN POR VERMICOMPOSTEO DE LODOS RESIDUALES APLICADOS EN LA PRODUCTIVIDAD DE ALBAHACA (Ocimum basilicum L.)

“…4). Fortis-Hernández et al (2018) explican que, para el cultivo de tomate, los fertilizantes orgánicos basados en vermicompostas inducen la concentración de licopeno en frutas, así como mejoras en el contenido de fenoles y antioxidantes.…”