• Korean Journal of Soil Science and Fertilizer
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• v.14 no.3
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• pp.163-168
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• 1981

The studies were carried out to examine the effect of soil improvement agents, such as lime, wollastonite and phosphate, in reducing the damage caused by hydrogen fluoride gas to the vegetative growth of rice. The yield loss, damage rate of the plant leaves, the fluoride and silicate concentrations of the plants were measured. The results obtained are summarized as follows : 1. Of various levels of added lime and wollastonite, the best were found to be neutralized lime plus lime 150kg/10a, and wollastonite 150kg/10a. 2. Added fluoride increased the fluoride content of the plant and the damage rate of the plant leaves, and the yield was greatly decreased. 3. The silicate concentration at harvesting period was also increased by high amounts of fluoride in the plant during vegetative growth. 4. Increasing the amount of added lime increased the watersoluble silicate concentration in the soil. The silicate content of the plant showed the same tendency.

• Korean Journal of Soil Science and Fertilizer
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• v.16 no.2
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• pp.183-187
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• 1983

The investigate the varietal differences is physiological characteristics related to nutrient uptake and response to nitrogen and phosphorus, a pot experiment was conducted in a temperature control chamber. Three varieties with different cold resistances were grown under normal ($23^{\circ}-25^{\circ}C$) and cold ($15^{\circ}C$) conditions with three nitrogen and phosphorus application levels. The cold temperature was treated for twelve days after thirty days from seeding. The results were summarized as follows: 1. Dry weight and nutrient contents were reduced in cold temperature treatment compared with control and the reduced ratio by low temperature were in order of dry weight 29.4% $P_2O_5$ 21.3%, N 15.3%, $K_2O$ 10.1%, $SiO_2$ 8.7%. 2. The reduced ratio of phosphorus contents of each varieties to normal condition were 13.5% in resistant, 19.5% in medium, 31.1% in susceptible variety, respectively. 3. The phosphorus and silicate contents of plants showed a good relationship with varietal differences in cold resistance but nitrogen and potassium didn't showed, therefore, phosphorus and silicate contents might be used as the index for physiological characteristics related with cold resistance. 4. Phosphorus content slightly increased with nitrogen application but silicate content decreased. Upon phosphorus application, nitrogen and silicate contents were increased.

• Korean Journal of Soil Science and Fertilizer
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• v.10 no.4
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• pp.235-243
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• 1978

A field experiment was conducted to confirm the effect of phosphorus, calcium silicate and different kinds of organic matter to a red-yellow heavy clay textured paddy soil, developed on alluvial terrace. 1. The yield response of phosphorus was very high in both Tongil (Indica x lap.) and Jinheung (Japonica type) varieties. Twenty percent of yield increase with 56kg $P_2O_5$ per 10a. 2. Yield increase by application of phosphorus was closely resulted from increase of tillers per plant. The increases of tillers per plant as observed at harvesting stage by phosphorus fertilization were 3.6 tillers in Tongil, 1.9 in Jinheung, while ripening ratio adversely was decreased 4% in Tongil and increased 3% in Jinheung. 3. High correlation between P content and yield was found at earformation and heading stages. The content of P in rice plant necessary to produce maximum yield in this soil was 0.8 percent at earformation stage. 4. The effect of silicate was not significant for Tongil but was obvious for Jinheung, and the effect of compost and rice husk was also significant for Jinheung. 5. Addition of silicate and lime to phoshorus treatment decreased the nitrogen content of rice plant, especially in Tongil. Accordingly, significant responses of silcate and lime seems be appeared by increasing the rate of nitrogen application.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2005.11a
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• pp.126-129
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• 2005

• Proceedings of the Korean Society of Crop Science Conference
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• 2004.04a
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• pp.136-137
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• 2004

• KOREAN JOURNAL OF CROP SCIENCE
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• v.12
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• pp.15-20
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• 1972

There are still many problems on the physiological role of silicon in rice plants, although, it has been reported that silicate slag is the most effective fertilizer for the improvement of Akiochi soils. This experiment is carried out to investigate the effect of silicate of the mineral nutrition uptake by rice plants, using Ca45, P32, C136, and Mn54. The obtained results are summerized as follows; 1. Contents of mineral nutrients except silicon were higher in the rice plant grown in minus Si-culture solution a than in plus Si-plot. 2. Transpiration amounts appeared to be greater in the low content plant of silicon. 3. The rate of translocation to shoot of each ion absorbed by roots depended on the rate of transpiration. 4. It seemed that only CI uptake was found small in minus Si-root. 5. Silicate fetilizer did not affect the solubility of mineral ions in soils.

• Korean journal of applied entomology
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• v.13 no.1 s.18
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• pp.33-39
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• 1974

For the investigations on the mechanism of blast disease resistance in the rice variety 'Toilg-il', Ihe chemical contents such as silicate, nitrogen and flavonoid in the leaf blades of tile variety were determined as compared to moderately susceptible variety 'Pung-kwang' A correlation between disease severity of rice blast and the chemical contents in the variety 'Pung-kwang' were also studied. The results showed that silicate and flavonoid contents were decreased inversely with application of nitrogen fertilizer, and negative correlation between silicate and flavonoid contents and disease severity in the field were observed. In the resistant variety 'Tong-il', these chemical contents and silicified cells were significantly higher than in the variety 'Pung-kwang' From these results, it seemed that the high contents of silicate and flavonoid in the leaf blades were related closely to the resistance of the variety 'Tong-il'.

• Korean Journal of Soil Science and Fertilizer
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• v.47 no.3
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• pp.179-186
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• 2014

Weathering indexes of the typical pedons derived from different parent materials of the soils of Korea were calculated by Kronberg and Nesbitt (1981) to understand weathering degree of the soils which might give a clue of soil formation and characterizing a soil pedon. The weathering index W1 was chemical change index, and the weathering index W2 was silicate dominant index. The chemical compositions of the 49 typic pedons were extracted from the Taxonomical Classification of Korean Soils (NIAST, 1999). The weathering indexes of Kimhae series, derived from fluvio marine material, were the highest among the analyzed soils. Within parent materials, the weathering indexes of the soils derived from limestones parent materials were high, and those derived from phorphyry materials were low. The relationship between W1 and W2 showed unique pattern which implied certain sequence within the same parent materials.

• Korean Journal of Organic Agriculture
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• v.6 no.1
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• pp.117-125
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• 1997

For the environmental protection, it is more desirable to use compost rather than chemical fertilizer. So in this paper, the effects of compost upon the rice quality were investigated with Hwajin Rice as the test variety. The rice quality and physicochemical characteristics were examined and the resrlts are as follows. As to the rice quality, the rate of polished rice was high in the non-fertilizer and the compost plot, the degree of transparency was high in the order of the traditional, the compost+urea, the compost and the non-fertilizer plot. The amylose content (one of the physicochemical characteristies of the rice), the rate of Mg/K, and the adhesivity and the cohesion power (charateristies of texturogram which show the density of boiled rice) were also high in the compost polt. Among the amylogram characteristics, the gelatinization temperature was lowest in the compost plot ; the lowest and the highest degree of viscosity and the break down were also inclined to be higher in the compost plot than in the traditional plot. After the soil test, the components of available phosphorus, organic matters, calcium, magnesium, potassinm and silicate increased in the soil as compared with those before test.

• Korean Journal of Soil Science and Fertilizer
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• v.20 no.4
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• pp.309-314
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• 1987

This study was conducted to examine mineralogical aspects on anthractite and bituminous coal-fired power-plant ashes as a source of mineral fertilizer. Fly ashes contain dominant amounts of silica and alumina and considerable quantitites of potassium and boron. However, potassium and silica present in unavailable forms for plant growth. X-ray, DTA, and IR analysis of ash particles indicated the formation of new mineral, mullite with shape of which were spherical in the surface morphologies of SEM. Detailed SEM investigation showed the presence of imbedded blocky shape silicate material.