• Korean Journal of Soil Science and Fertilizer
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• v.23 no.1
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• pp.34-39
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• 1990

The experiment was conducted in the pots of flooded saline paddy soil to evaluate influence of rice straw and gypsum application on germination and early growth status of directly sowed rice seedlings. 1. Germination percentage of rice seedlings were higher in treatment sowing at 1 day after submergence than that of treatment sowing at 21 days after submergence, and was severely interrupted by rice straw application. 2. Application of rice straw promoted the release of bicarbonate and volatile fatty acid of submerged water, while the amount of sulfate and soluble cations were decreased as compared to control. 3. Germination percentage of rice seedling had significant negative correlations with chemical characters of submerged water, and was highly affected by submerged water at 7 days after sowing. 4. Rice straw application interrupted germination of rice seedling by increasing pH of submerged water over critical level, and gypsum application depressed the early growth of young seedling dues to high salt concentration. 5. The relaease of bicarbonate was remarkedly increased with increasing pH over 7.5 of submerged water.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.47 no.6
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• pp.422-426
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• 2002

In other to find out the basic information on cultivation and breeding for salt tolerance in rice, these studies were conducted at salinity paddy fields containing 0.2, 0.3, 0.4% of salt and normal paddy field using 6 Japonica type, 5 Tonsil type varieties and Annapurna. On these fields a series of investigation was made for the responses of rice growth and yield to salt content of saline sails. The heading dates of the rice cultivated at salinity 0.2, 0.3 and 0.4% were delayed compared by 2 or 3,5 or 8 and 10 or 13 days respectively in Japonica and Tonsil type varieties to those at the normal paddy fields. The culm length at salinity paddy fields decreased by 13-39% in Japonica type and 14-35% in Tongil type varieties. But the number of panicles per hill decreased by 16-40% in Japonica type and by 14-35% in Tongil type varieties. The number of grains per panicle in saline paddy fields decreased by 10 to 40% in all varieties, but the percent ripened grain decreased by 20-48% in Japonica type and by 19-51% in Tongil type varieties. 1000 grains weight was decreased by lower than 23% in all varieties, but yield was reduced to 20-62% in Japonica and 25-67% in Tongil type varieties.

• Applied Biological Chemistry
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• v.8
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• pp.65-73
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• 1967

For the study of method for salt elimination aimed at reforming tidal land into normal paddy fields in a short period with reduction of periods requiring for elimination of saline, CHP (a kind of Ca-hum ate), a soil conditioner made of peat as a main material was tried. In the pot experiment, effect on elimination of salt, improvement of physical-chemical characteristics and rice cultivation test were studied. The results of these tests are as follows: 1, CHP treatment somewhat improves aggregation state with some effect on aggregation. 2. CHP treatment is remarkably effective in permeability which increases with 1.0 percent treatment by three times in percolation rate, and by 4.5 times in volume of leached water respectively. 3. With the increase of CHP amounts, salt was eliminated in short period. When 80% of the total Na was leached in 1.0% CHP-A treated pot, control pot begins permeable. 4. CEC and phosphorous absorption capacity are not influenced by CHP treatment. 5. Growing state of rice is greatly influenced by rainfalls. Growth of rice in tidal land however are almost similar to those in normal paddy fields with layer amounts of CHP treatment. With salt content in the soils, saline hazard and numbers of ineffective stems, amounts of unmatured grain are increased. 6. With the treatment of CHP yields of rough rice were increased. With 0.5% CHP treatment the yields were similar to those of the normal paddy fields. With 1.0% CHP-A treatment, the yields were increased by 15 times more than those of none treated soil and by 25 percent more than normal paddy soils.

• Korean Journal of Soil Science and Fertilizer
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• v.41 no.2
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• pp.94-102
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• 2008

The physico-chemical properties of ten reclaimed saline soils in five soil series of west-south Korea were analyzed according to the years past after reclamation. The soil samples were collected at the same sites two times in 2000 and 2004. The physico-chemical properties in 2000 had been changed in 2004 as follows. Soil salinity was the highest in Podu and desalinization period was the shortest in Munpo and Yeompo. Seasonal ground water level were above 100 cm in all regions that were 30 years old reclaimed tidal land, which was the same results of normal paddy field. In the case of soil physical changes, bulk density increased in fine textured soil (Poseung and Podu) but decreased in coarse textured soil (Gwanghwal, Munpo, and Yeompo). Porosity decreased in fine textured soil(Poseung and Podu) but increased in coarse textured soil. These reason were as follows. Fine textured soil were increased in solid phase but decreased in liquid and gaseous phase. Coarse textured soil, Gwanghwal and Munpo except for Yempo, were increased in gaseous phase but decreased in solid and liquid phase. Yempo that have low water table level were increased in liquid phase but decreased in solid and gaseous phase. Soil hardness increased in 4 soil series except for Munpo. In the case of chemical property changes, although there were more or less difference, it showed decreasing tendencies. Soil pH, the content of organic matter, available phosphate, and available silicate of five soil series were decreased during the four years. The content of exchangeable cation also decreased except for magnesium.

• Korean Journal of Soil Science and Fertilizer
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• v.20 no.2
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• pp.193-197
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• 1987

Associative heterotrophic nitrogen fixing bacteria were identified by immunodiffusion method in the histosphere of Planta-ginaceae, Caryophllaceae, Gramineae, and two types of rice cultivars. Twenty four strains associative heterotrophic bacteria with high ARA (more than 10nmole/tube/hr) were isolated from the histosphere of grasses and rice.* Those strains were related with 8 species of Azospirillum, 11 species of Pseudomonas, 2 species of Klebsiella and 2 species of Agrobacterium. Among them Azospirillum sp. and Pseudomonas sp. were predominant in histosphere of grasses and rice cultivars. From the histosphere of Oryza sativa, and Sagina maxima, the strains of Azospirillum, Pseudomonas, Klebsiella, and Agrobacter were identified while Pseudomonas was identified from Ischaemum anthephoroides, Plantago lanceolata, Miscanthus sacchuriflorum, and only Azospirillum was identified from Zoisia sinica, respectively. Associative nitrogen fixing heterotrophic bacteria were more abundant in the histosphere of Oryza sativa and Sagina maxima than that of other grasses grown in saline and reclaimed saline paddy soil.

• Korean Journal of Plant Resources
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• v.17 no.3
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• pp.339-351
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• 2004

This study was conducted to evaluate the effect of phased horticultural therapy(HT) program on the experience of psychologic therapy and the development of job and social integration in the mentally handicapped persons. In this study, the mentally handicapped persons participated in HT program were chosen in disabled person's welfare institute of Jeonnam. HT program was performed twice a week with 1 hour activity for 4 months. As a results, the mentally handicapped persons participated in HT program showed high interest of horticulture and improvement of self-respect and the high satisfactory degree of HT program. Therefore, the mentally handicapped persons were showed the experience of both physical and mental therapy, improvement of self-esteem scale and sociality in HT program. Also, the application of HT program with continuously interest will be showed high improvement of physical, psychological and sentimental. In the course of this HT program progress, horticultural therapist and social welfare officer were showed the limitation of role. Therefore the leaders of group for successful HT program be required the comprehensive plan of more efficient HT program and induced technique of continuously up-phased improvements in HT program progress.