The experiment examined the efficacy of various post harvest treatments namely control, hot water treatment, thin plastic film, chlorinated water, neem extract and garlic extract on shelf life and quality of mango. Parameters studied were colour, firmness, disease severity, disease incidence, total soluble solids, total weight loss, moisture content, dry matter and shelf life of mango. The longest shelf life of 15.41 days was found in mango fruits wrapped with thin plastic film.
The allelic diversity and relationship among 120 Aus rice landraces were determined through DNA fingerprinting using microsatellite (SSR) markers. A total of 85 SSR markers were used to characterize and discriminate all tested Aus rice genotypes, 45 of which were polymorphic for different chromosome numbers. The number of alleles per locus varied from 6 alleles (RM484 and RM541) to 30 alleles (RM519) with an average of 13 alleles per locus. The polymorphic information content (PIC) values varied ranged from 0.5211 (RM536) to 0.9369 (RM519) with an average 0.8217. The highest PIC value (0.9369) was obtained for RM519 followed by RM286 (0.9357). The genetic distance-based results seen in the unrooted neighbor-joining tree clustering revealed nine genetic groups. Being grouped into distant clusters and with highest genetic distance, eleven genotypes viz., Atithi dhan, Kadar chap, Pankiraj, Japanese-7, Jamri saity, Logi jota, Joba, Lada moni, Manik Mondal-2, Boilum and Brmulka-2 could be selected as potential parents for crop improvement for their distinctive characters. Panchash and Parija had closest distance in the SSR based CS-Chord distance (0.000) might have same genetic background. The highest genetic dissimilarity (1.000) was found among the nineteen Aus genotypes combinations followed by the second highest (0.9778) among 94 Aus rice combinations. Whereas lowest genetic dissimilarity was found between Kala and Kalo Hizli (0.1778) followed by Holat and Holae (0.2667). This information will be useful in the selection of diverse parents, background selection during backcross breeding programs and assist in broadening germplasm-based rice breeding programs in the near future.
Nitrogen is the most limiting element in Bangladesh soils and urea is the fertilizer commonly used for supplying it. Bradyrhizobium/Rhizobium inoculant was tried as a source of N nutrition for grain legumes in a number of field experiments. The inoculants markedly increased nodule number, nodule mass, shoot weight and yield of the crops compared to uninoculated control and urea-N treatments. For soybean (Glycine max), inoculation increased yield 113 percent over the control and 49 percent over the urea treament. For groundnut (Arachis hypogaea), the increases were 36 and 11 percent; for lentil (Lens culinaris), 30 and 13 percent; and for mungbean (Vigna radiata), 47 and 7 percent. The local inoculant strains were suitable for dependable inoculant production. The inoculant technology can be used as a promising and cheap substitute of urea for growing food legume crops in Bangladesh.
The field experiment was carried out at Bangladesh Institute of Nuclear Agriculture, Mymensingh during October 2017 to March 2018, to investigate the effect of different levels of phosphorus and mulches on growth, yield attributes and yield of tomato cv. Roma VF. Two factors: (i) Four levels phosphorus viz., 0, 40, 80 and 120 kg P ha-1 and (ii) four different mulches viz., no mulch (control), water hyacinth, rice straw and banana leaves. The experiment was laid out in two factors randomized complete block design with four replications. The effect of phosphorus levels and mulches on morphological characters: plant height, leaf number plant-1, reproductive characters: number of flower clusters plant-1, flowers plant-1, days to flowering and yield contributing characters: number of fruits plant-1, fruit length, single fruit weight and fruit yield both plant-1 and ha-1 was significant. The highest morphological and reproductive characters, yield contributing characters and fruit yield (71.98 t ha-1) were recorded in 120 kg P ha-1 followed by 80 kg P ha-1 (69.76 t ha-1) with same statistical rank. In contrast, the above morphological, reproductive, yield attributes and fruit yield (47.62 t ha-1) was recorded in control plant where no phosphorus was applied. Application of P @ 80 kg ha-1 was found suitable dose for tomato cultivation. Among the three mulches, water hyacinth had remarkable effect on plant growth and yield attributes which resulting the highest fruit yield (68.35 t ha-1) in tomato. So, we may use water hyacinth mulch with application of 80 kg P for maximizing tomato fruit yield during winter season for silty loam soil. SAARC J. Agri., 18(1): 153-160 (2020)
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