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RISS 인기검색어
- 검색키워드
- 저자 : Yasufumi Fukumoto (검색결과 7 건)
- 무료
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Development of Supply System of Microbubble Ozonated Water in Agriculture
Yasufumi Fukumoto,Kazuto Hashizume,Yasuyo Nishimura 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.1
The demand for safe vegetables and fruits that do not rely on agricultural chemicals is growing. As a result, ozone has attracted attention as a new sterilization method in agriculture, but there are problems in utilizing ozone gas from the point of view of safety. Although ozone in its liquid state (in which it is dissolved in water) would be of a more practical use, ozone gas is hard to dissolve in water. This study was performed to determine the effectiveness of microbubble ozonated water. Microbubbles help to achieve a high dissolution rate for gaseous ozone in water. The time taken to achieve a certain concentration of ozone dissolved in water was reduced by half and was maintained for as much as three times longer compared with conventional aeration technology. No damage occurred to crop stems and leaves when sprayed with the microbubble ozonated water; however, if part of the culture solution was infested by a pest in the circulating soilless culture, it could cause the death of all plants. A bacterial withering disease of the tomato was completely controlled by a 5 ppm concentration of ozone in microbubbling water. Growth inhibition was not observed even though the root of the tomato was submerged in a high concentration of ozone (18 ppm) in water. Growth of Brassica rapa L. in a circulating soilless culture (NFT system) was promoted by using microbubble ozonated water. The growth and yield of strawberries was also promoted by spraying the stems and leaves with microbubble ozonated water. In addition, the injection of ozonated water into soil controlled the generation of weeds. Furthermore, the effectiveness of this application increased as the frequency of processing increased. These results indicate that it is possible to achieve safe agriculture and environmental conservation, without depending on agricultural chemicals, by using microbubble ozonated water.
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Phommy Inthichack,Yasuyo Nishimura,Yasufumi Fukumoto 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.2
This study determined the effect of potassium (K) sources and rates on plant growth and yield for hydroponic cabbage, celery and lettuce, and also identified deficiency symptoms that would be helpful in treating deficiencies. We used seven treatments: one control treatment with 164.8 mg・L-1 K concentration in nutrient solution and six additional K treatments achieved by adding K2SO4 and KCl to get higher K of 321.8 mg・L-1, 482.7 mg・L-1, and 643.7mg・L-1, respectively. Increasing the K concentration in the nutrient solution greatly affected the growth and yield of cabbage, celery and lettuce, especially the yield quantity, and the Ca and Mg content of plant tissues. Increasing the K concentration to 482.7 mg・L-1 improved the yield of cabbage, celery and lettuce while a further increase of K to 643.7 mg・L-1 did not result in any additional benefits. On the other hand, the Mg concentration, but not Ca, decreased with an increase in K supply but the concentration was still at a sufficient level. Supplying the K in the form of KCl resulted in a relatively higher yield for celery but not for cabbage and lettuce, irrespective of the amount of K fertilization. In addition, supplying the K in the form of K2SO4 resulted in higher tip burn incidence compared to KCl, especially at high K concentrations. This study determined the effect of potassium (K) sources and rates on plant growth and yield for hydroponic cabbage, celery and lettuce, and also identified deficiency symptoms that would be helpful in treating deficiencies. We used seven treatments: one control treatment with 164.8 mg・L-1 K concentration in nutrient solution and six additional K treatments achieved by adding K2SO4 and KCl to get higher K of 321.8 mg・L-1, 482.7 mg・L-1, and 643.7mg・L-1, respectively. Increasing the K concentration in the nutrient solution greatly affected the growth and yield of cabbage, celery and lettuce, especially the yield quantity, and the Ca and Mg content of plant tissues. Increasing the K concentration to 482.7 mg・L-1 improved the yield of cabbage, celery and lettuce while a further increase of K to 643.7 mg・L-1 did not result in any additional benefits. On the other hand, the Mg concentration, but not Ca, decreased with an increase in K supply but the concentration was still at a sufficient level. Supplying the K in the form of KCl resulted in a relatively higher yield for celery but not for cabbage and lettuce, irrespective of the amount of K fertilization. In addition, supplying the K in the form of K2SO4 resulted in higher tip burn incidence compared to KCl, especially at high K concentrations.
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Phommy Inthichack,Yasuyo Nishimura,Yasufumi Fukumoto 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.1
A plot experiment was carried out to determine the plant growth and mineral composition of three Solanaceous fruit vegetables for the responses to diurnal temperature alternations. Eggplant, sweet pepper, and tomato were grown in four phytotrons with diurnal temperature fluctuations between day and night temperatures (DIF) set constantly 12hours day and night of 15/25℃, 17.5/22.5℃, 20/20℃, 25/15℃, and in a plastic-house as a control with average air temperature of 31.3℃ at day-time and 19.1℃ at night-time. After six weeks of cultivation, the growth of three tested crops as reflected in leaf dry weight, plant height, stem dry weight and root dry weight were significantly reduced by a negative DIF of 15/25℃ compared to other DIF treatments and the control. In contrast to the growth parameters,a positive effect was observed on the average mineral absorption in all three crops. A negative DIF of 15/25℃increased Ca, K, and Mg content in the fruit, root, and stem of eggplant and tomato. The results suggest that all DIFs may be beneficial to greenhouse or field grown Solanaceous vegetable producers, by controlling the vegetative growth which will facilitate the crop management, with no limitations on uptake rates of mineral nutrients which are required to determine yield and fruit quality.
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Study on the Seedling Traits of Eggplant Grown in Several Different Types of Nursery Culture Media
Yasuyo Nishimura,Chrisanto A.G. Ballila,Yasufumi Fukumoto,Masayuki MuraiI,Michael T. Barnor 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.2
An F₁ hybrid cultivar of eggplant ‘Casino 901’ was used in the present study. Differences in traits of seedlings grown in seven culture media were investigated. The three organic and four inorganic media used for the soilless culture were Bark-compost, Coco-peat and Coco-chip, and Charcoal, Sand, Pumice and Rockwool cube, respectively. Seedling traits were measured 59 days after sowing. For plant height, total dry weight, leaf dry weight, stem dry weight and root dry weight, the three organic media gave higher values than the three inorganic media except Rockwool. In particular, Barkcompost gave the highest value for the four above-mentioned traits except root dry weight. For shoot/root ratio, analysis of variance indicated a significant difference among the seven culture media but no significant difference between the organic and inorganic culture media. The SPAD value was the lowest for charcoal in all the treatments. The pH value of the extracted solution was significantly lower for sand than other media. The EC value for the extracted solution from the three organic media was higher than the inorganic media. The three organic culture media and Rockwool had higher moisture percentages at all times after saturation compared to the other three inorganic media. Consequently, the three organic media, particularly bark-compost, may be favorable for eggplant seedling growth.
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