The present experiment was carried out at the Laboratories of the Department of Horticulture and Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh during the period from February to April 2019 to study the effect of maturity indices and modified atmosphere packaging (MAP) on the extension of shelf life and quality retention of cherry tomato. The two-factor experiment consisted of three maturity indices viz. (i) Maturity index 1 (M1: Mature green color), (ii) Maturity index 2 (M2: Yellow color), and (iii) Maturity index 3 (M3: Red color) and five postharvest treatments viz. (i) Control (T0), (ii) Low density perforated poly ethylene, LDPPE (T1), (iii) Low density poly ethylene, LDPE (T2), (iv) Low density perforated plastic box, LDPPB (T3), and (v) Low density plastic box, LDPB (T4). The experiment was conducted in completely randomized design with 3 replications. The maximum weight loss (7.77%) was recorded in mature green color fruits (M2) treated with control (T0), while the minimum (3.22) was found in yellow color fruits (M2) treated with LDPPB (T3). The maximum color change was observed from yellow color fruits (M2) with LDPPB (T3) and the minimum was observed from mature green color fruits (M1) treated with control (T0). The maximum TSS content (7.20%) was recorded from yellow color fruits (M2) treated with LDPB (T4), while the minimum (5.67%) was found in mature green color fruits (M1) treated with LDPPB (T3). The highest disease incidence and severity (16.67% and 21.67%, respectively) were recorded in red color fruits (M3) treated with control whereas the lowest disease incidence (1.67%) and severity (2.33%) were found in yellow color fruits (M2) treated with LDPPB. The longest shelf life (25.00 days) was obtained in yellow color fruits (M2) treated with LDPPB (T3) and the shortest shelf life (7.00 days) was observed in red color fruits (M3) treated with control (T0). Thus, yellow color fruits (M2) treated with LDPPB (T3) could be used for the extension of shelf life and quality retention of cherry tomato. Progressive Agriculture 32 (1): 43-59, 2021
The research work was done to assess the postharvest soil fungal population and to find out the relation between population dynamics of Trichoderma and soil borne disease of 41 eggplant cultivars. Soil samples collected from IPM lab germplasm maintenance field at post-harvest stage were analyzed for microbes in dilution plate technique. Fungal colonies appeared in each plate were counted and made their average. Incidence and severity of Fusarium wilt and Sclerotium collar rot in the plot of 41 eggplant varieties were recorded at flowering-fruiting stage. The highest total soil fungal population was estimated from the plot soil of eggplant var. Singnath S (IPM- 42) that was 40.75×104. The var. Bijoy had the lowest fungal population that was 7.5×104. A comparison between Trichoderma population and other fungal population was made. Different eggplant cultivars had variation in the population of two important soil fungi- Trichoderma and Fusarium. The total populations of Trichoderma and Fusarium in the plot soil of 41 eggplant varieties were 129.75 and 348.75 × 104 per gram of soil, respectively. The average number of colonies of Trichoderma varied with the range (1-8.25) per plate. Fusarium varied with the range from (2-22.50). In 20 important eggplant varieties out of 41, both Fusarium wilt and Sclerotium collar rot incidence ranged between 0.00 to 40.00%. The variety Puta begun had the highest incidence of Fusarium wilt with the highest soil population of Fusarium oxysporum against the absence of Trichoderma harzianum. The disease incidence at flowering-fruiting stage was negatively correlated with the population of Trichoderma. Disease severity decreased with the increase in Trichoderma population. Increase of Trichoderma population, decreased the population of other fungi (Fusarium oxysporum and Sclerotium rolfsii). These results are clearly indicating that Trichoderma might have the antagonistic potential and might contribute to the reduction of incidence of soil-borne diseases. Progressive Agriculture 32 (1): 31-42, 2021
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