All issues
Volume 44 (2013)
- Issue 4 Pages 167-
- Issue 3 Pages 100-
- Issue 2 Pages 51-
- Issue 1 Pages 1-
Volume 44, Issue 2
Vol. 44, No. 2 (Ser. No. 137)
Displaying 1-4 of 4 articles from this issue
- |<
- <
- 1
- >
- >|
-
Masayuki TANI, Taku KATO, Daigo AIUCHI, Fumihito MIYATAKE, Masanori KO ...2013 Volume 44 Issue 2 Pages 51-58
Published: 2013
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSFertilizer nutrient composition and nitrogen mineralization of distillation wastes discharged from bio-ethanol production made from different dicotyledonous materials (sweet potato, potato, and sugar beet) were investigated. Also, the effects of their arable land application on crop growth and nutrient uptake through pot and field experiments were examined. The distillation wastes from bio-ethanol production contained high concentration of fertilizer macro and micro nutrients which were available for crop plants. The nitrogen mineralization and nitrification processes were distinctly influenced by raw materials. Waste application for spinach in the pot experiment indicated that the wastes were effective to supply alternative fertilizer nutrients and fertilizer efficiencies of phosphate and potassium in the wastes were more than 100 %. The alternative effects of the distillation wastes made from starch-potato upon field application for food-potato production were also observed distinctly, suggesting that the wastes from bio-ethanol production should be used effectively through arable land application.View full abstractDownload PDF (1215K) -
Kenichi TAKIZAWA, Kazuhiro NAKANO, Shintaroh OHASHI, Masaru HIROI, Shu ...2013 Volume 44 Issue 2 Pages 59-64
Published: 2013
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSIt is impossible to distinguish the astringent fruit in ‘Le Lectier’ pears by visual inspection. This study aimed to develop nondestructive determination of the astringent fruit and quality assurance of the intact fruit using neural network classification, visible and near-infrared spectroscopy. For this study, 51 pears harvested in Sanjo City and 46 pears harvested in the Tsukigata area of Niigata City, 97 pears in all were collected. The recognition ratio was established by neural network learning and validation repeatedly using leave-one-out cross validation. The average recognition ratio was 81.1 % when the neural network was discussed using 15 hidden layer units and set an error goal to 0.11 and calculated by 10 times cross validation.View full abstractDownload PDF (1865K) -
Kentaro TAMAKOSHI, Haruhisa INDEN2013 Volume 44 Issue 2 Pages 65-72
Published: 2013
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSWe investigated the effect of fruit load on the growth and yield of long term greenhouse tomato (Solanum lycopersicum L. cv. Elegance) to establish high and stable production method in Japanese climate. Three treatments set at differences in fruit number per truss in which fruits were pruned to four, six or no-thinning. Although there was not significant difference in the number of leaves and flowering trusses, leaf area of four fruit per truss was the largest, followed by others. The flowering rate and harvesting rate mainly depend on temperature but not on fruit load. The weight of leaf, stem and root decreased with increasing the number of fruit, especially reduction was higher in root was weight. Six fruits per truss produced the highest yield. The similar trend was observed in fruit dry weight. The average fruit weight of four fruits per truss was the biggest, followed by others. Fruit thinning had no effect on the Brix of the fruit. The high correlation was observed between total plant weight and fruit weight. The similar relation was observed between vegetative part weight and fruit weight. It can be concluded that the total plant weight was an important factor for high yield. Furthermore, six fruits per truss seem to be optimum number for high yield.View full abstractDownload PDF (2419K) -
Hiroki KAWASHIMA, Takao FURUICHI, Kiyoshi MIYAUCHI, Makio HAYASHI, Tak ...2013 Volume 44 Issue 2 Pages 73-82
Published: 2013
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSThe effect of a special multi-layered thermal curtain, referred to as the “Futon screen”, and water heat storage on the heating load of a pipe-framed greenhouse was investigated, through a comparison between two pipe-framed greenhouses; one was a greenhouse equipped with the multi-layered thermal curtain (M-house), and the other was a control greenhouse (C-house). The internal temperature of C-house and M-house, both being without heating, were 2.4 ℃ and 7.1 ℃, respectively, when the outside temperature was 0 ℃. The heating load coefficient of M-house, 1.43 W・m-2・℃-1, was lower than that of C-house, 2.39 W・m-2・℃-1. Further, the consumption of heating oil and the heating load of M-house were both approximately 40 % lower than those of C-house. It was clear that the Futon screen reduced the heating load of the greenhouse by approximately 40 %. With the introduction of the water heat storage, the heat loss coefficient of M-house did not change; however, the heating load coefficient of M-house reduced from 1.43 W・m-2・℃-1 to 0.91 W・m-2・℃-1. Further, the consumption of the heating oil in M-house with the water heat storage was reduced to 36 % that of C-house.View full abstractDownload PDF (2531K)
- |<
- <
- 1
- >
- >|