• Title/Summary/Keyword: 담수직파

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The Influences of Rice Straw and Gypsum Applied to a Saline Soil on the Growth Status of rice Seedlings when Flooded Direct Sowing (볏짚 및 석고시용(石膏施用)이 간척답(干拓畓) 직파(直播)벼의 초기생육(初期生育) 장해(障害)에 미치는 영향(影響))

  • Hwang, Seon-Woong;Lee, Choon-Soo;Lee, Yong-Jae;Kwak, Han-Kang;Park, Nae-Jung
    • 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.

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Optimum Water Management Practices for Direct Seeding on Paddy Surface of Saline in Soils in Reclaimed Tidelands (서남부 간척지에서 토양염농도별 벼 담수표면직파 파종전.후 물관리방법)

  • Back, Nam-Hyun;Ko, Jong-Cheol;Nam, Jeong-Kwon;Kim, Bo-Kyeong;Park, Hong-Kyu;Kim, Sang-Su;Kim, Chung-Kon
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.52 no.2
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    • pp.204-207
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    • 2007

  • This study was conducted to suggest proper water management practices after and before broadcasting of rice seed on flooded paddy surface at reclaimed saline soil with two different saline levels in Gyehwado Substation of Honam Agricultural Research Institute (HARI) NICS, RDA for two years from 2004 to 2005. The stable seedling stand in low saline soil of 0.1% salinity was obtained by one time of water exchange after soil rotary Whereas in medium saline soilof 0.3% salinity, three times of water exchange was required for the stable seedling stand. Milled rice yield was not affected by frequency of water exchange in low saline soil, while it decreased sharply in one and two times of water exchange compared with three times of water exchange in medium saline soil. Irrigation water immediately after direct seeding increased the number of seeding stand in low saline soil. With the increase in the interval of water exchange after direct seeding, the milled rice yield decreased. Although the continuous water flowing showed the most number of seedling stand and was increased milled rice yield compared with the others interval of water exchange in medium saline soil, the number of seedling stand and milled rice wasn't significantly different up to exchange of two days interval compared with the continuous water flowing.

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