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Bathua (Chenopodium album), a fast-growing weedy annual plant under the genus Chenopodium, is valuable for its high nutritional, medicinal and economic values as a leafy vegetable. The present study was carried out to evaluate the growth performance and economic returns of bathua genotypes in acid soil at Sylhet, Bangladesh. The experiment was laid out in a randomized complete block design with three replications. Morphological and growth parameters were recorded at the final harvest. The maximum plant height, number of branches per plant, fresh weight of inflorescence and leaf length were recorded in local bathua 1(110.5 cm, 65.33, and 8.93 g, respectively). The maximum fresh weight of leaves per plant, the maximum dry weight of leaves per plant were recorded in local bathua 2 (39.92 g and 8.79 g respectively). Results revealed that the studied morphological parameters including plant height, fresh and dry weight of leaves per plant, fresh and dry weight of stem per plant, fresh and dry weight of inflorescence per plant, stem base diameter, number of leaves per plant, number of branches per plant and leaf length influences the foliage yield of bathua. The highest foliage yield (9.20 t.ha-1), total gross return (Tk.552000.ha-1), net return (Tk.367000.ha-1) and BCR (2.98) were found in local bathua 1. From the findings of the present study, local bathua 1 could achieve higher productivity and profitability in acid soils of Sylhet, Bangladesh.

博士（学術）, doctoral, 創造科学技術大学院, 静岡大学, 甲第1111号

Near-infrared (NIR) spectroscopy has been used to non-destructively and rapidly evaluate the quality of fresh agricultural produce. In this study, two commercially available portable spectrometers (F-750: Felix Instruments, WA, USA; and SCiO: Consumer Physics, Tel Aviv, Israel) were evaluated in the wavelength range between 740 and 1070 nm to non-invasively predict quality attributes, including the dry matter (DM), and total soluble solids (TSS) content of three fresh table grape cultivars (‘Autumn Royal’, ‘Timpson’, and ‘Sweet Scarlet’) and one peach cultivar (‘Cassie’). Prediction models were developed using partial least-square regression (PLSR) to correlate the NIR absorbance spectra with the invasive quality measurements. In regard to grapes, the best DM prediction models yielded an R2 of 0.83 and 0.81, a ratio of standard error of performance to standard deviation (RPD) of 2.35 and 2.29, and a root mean square error of prediction (RMSEP) of 1.40 and 1.44; and the best TSS prediction models generated an R2 of 0.97 and 0.95, an RPD of 5.95 and 4.48, and an RMSEP of 0.53 and 0.70 for the F-750 and SCiO spectrometers, respectively. Overall, PLSR prediction models using both spectrometers were promising to predict table grape quality attributes. Regarding peach, the PLSR prediction models did not perform as well as in grapes, as DM prediction models resulted in an R2 of 0.81 and 0.67, an RPD of 2.24 and 1.74, and an RMSEP of 1.28 and 1.66; and TSS resulted in an R2 of 0.62 and 0.55, an RPD of 1.55 and 1.48, and an RMSEP of 1.19 and 1.25 for the F-750 and SCiO spectrometers, respectively. Overall, the F-750 spectrometer prediction models performed better than those generated by using the SCiO spectrometer data

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Densities, p, and viscosities, ?, of four binary systems: N,N-dimethyl formamide (DMF) + 1-propanol, DMF + 2-propanol, DMF + butanol and DMF + 1-pentanol have been measured at five different temperatures ranging form 303.15K to 323.15K at an interval of 5K. Excess molar volumes were found to be negative over the entire concentration ranges. The negative excess molar volume decreases with the increase of chain length of alcohol, the magnitude follows the order DMF+ 1-propanol >, + 2-propanol >, +butanol >, + 1-pentanol. The change of viscosity has been found to be sensitive to the chain length of alcohols. Excess viscosities and Grunberg- Nissan interaction parameters have been found to be positive for DMF + 1-propanol and DMF + 2-propanol systems, and negative for other two systems DMF + butanol and DMF + 1-pentanol. The thermodynamic energy of activation; such as, positive ?G#E each also compatible with the observation.