The physiological, microbiological and chemical quality changes were studied in carrots that received preharvest sprays of a commercial plant extract (ComCat) and subjected to disinfection and storage at 1 and 22C. At harvest, ComCat‐treated carrots had less aerobic and coliform bacteria population, higher contents of total available carbohydrates (TACs) and sucrose and lower glucose and fructose concentrations. During storage, ComCat‐treated carrots displayed reduced physiological weight loss (PWL) with lower sucrose, glucose and fructose concentrations. Disinfectants reduced microbial populations in carrots. Chlorine disinfection resulted in an etched surface, which was not observed for anolyte treatment. Anolyte water showed a better positive effect on PWL. Higher temperatures deteriorated quality characteristics of carrots. The TAC accumulated better in ComCat‐treated than in control carrots stored at room temperature. The combined effect of pre‐ and postharvest treatments had significant effect on maintaining postharvest quality and improvement of shelf life of carrots. PRACTICAL APPLICATIONS Preharvest ComCat treatment can be used to improve the overall quality of carrots. Disinfection of carrots using anolyte water was found to be superior to the chlorinated water dipping treatments. Thus, anolyte water is recommended for disinfection of carrots. Combining the preharvest ComCat treatment and disinfection using anolyte water, coupled with refrigerated storage environment should be used in the shelf life extension of carrots.
Postharvest losses in tomato (Lycopersicon esculentum L.) are among others, the prime factor affecting the quantity and quality of tomato fruits in the market. Options to avert these losses are limited, and thus the need to design research studies that are geared to developing such strategies. A field experiment was therefore conducted to study effects of preharvest treatment of ComCat® spray, manure, NP fertilisation and the combinations of ComCat® with the two forms of fertilisation and the control on yield and quality of tomato in semiarid climate in eastern part of Ethiopia. The experiment was conducted using randomised complete block design with 3 replications. Data were collected from two centeral rows of treatment plots to assess vegetative growth, yield and the chemical composition of fruits at harvest. The result showed that the use of ComCat® and its combination with manure gave the highest total yield 58.53 tha -1 and 55.77tha -1 of which 94% and 93% were marketable and total yield, respectively. By using manure and NP fertiliser it was observed that both marketable and total yield was not significantly influenced. The control tomato plants were found to give higher total and marketable yield on comparison with the preharvest ComCat® + NP treatment. The chemical qualities of tomatoes were improved by preharvest ComCat®, ComCat® + manure and ComCat® = NP treatments. Based on the varied performance of the treatements imposed, adoption of a particular teatment will depend on a specific recommendation dormain.Key Words: Ethiopia, fertilisation, Lycopersicon esculentum, marketable yield RÉSUMÉLes pertes après récolte de la tomate (Lycopersicon esculentum L.) sont parmi les autres, le facteur primordial affectant la quantité et la qualité de fruits de tomate sur le marché. Les options pour minimiser ces pertes sont limitées, et ainsi le besoin de concevoir les études de recherche qui sont adaptées au développement de telles stratégies. Une expérience de champ a été donc dirigée pour étudier des effets de traitement de pré récolte Comcat@ spray, le fumier, la fertilisation de NP et les combinaisons de Comcat@ avec les deux formes de fertilisation et le contrôle sur le rendement et la qualité de tomate dans le climat à demi aride de l'est de l'Ethiopie. L'expérience a été conduite sur de blocs complètement aléatoires avec 3 réplications. Les données ont été recueillies sur deux rangs centraux de terrains de traitement pour évaluer la croissance végétale, le rendement et la composition chimique de fruits à la moisson. Le résultat a montré que l'usage de Comcat@ et sa combinaison avec le fumier a donné le plus haut rendement total 58,53 tha -1 et 55.77tha -1 dont 94% et 93% était le rendement vendable et total, respectivement. En utilisant l'engrais de fumier et NP il a été observé que le rendement vendable et total n'a pas été significativement influencé. Les plantes de tomate de contrôle ont donné le plus haut rendement total et vendable par rapport pré récolte + le traitement de NP. Les qualités chim...
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