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RISS 인기검색어
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- 발행기관 : The Crop Science Society of Japan (검색결과 2 건)
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Sung, Jwa-Kyung,Jung, Jung-Ah,Lee, Byoung-Mo,Lee, Sang-Min,Lee, Yong-Hwan,Choi, Du-Hoi,Kim, Tae-Wan,Song, Beom-Heon The Crop Science Society of Japan 2010 Plant production science Vol.13 No.1
<P>Characterization of the release of degradable components of cover crops is important for determining the quality of soil nutrients for the following crop and weed occurrence. We have examined the temporal changes in soil phenolic carbon (C) and nitrogen (N) after incorporation of cover crops (hairy vetch and rye) with different C to N ratio and their effects on subsequent weed occurrence in the. Cover crops, hairy vetch (<I>Vicia villosa</I> Roth. cv. Hungvillosa) and rye (<I>Secale cereale</I> L. cv. Winter-green), grown in a glass house for 60 days, were harvested and incorporated into soil at the rate of 35 and 25 ton ha<SUP>-1</SUP>, respectively. The contents of total phenolics (TP) in hairy vetch- and rye-incorporated soil increased from 45.5 to 21.3 μg g<SUP>-1</SUP> DW and decreased from 17.7 to 37.0 μg g<SUP>-1</SUP> DW, respectively, from 10 to 50 d after incorporation (DAI). Inorganic nitrogen (InN) was substantially released from hairy vetch residues, and it remained over four-fold greater than those in the control or rye-incorporated soil at 30 DAI. In the correlation analysis, the TP content of soil correlated negatively (r=−0.55, P<0.01) with total carbon (TC), but TP content of soil did not correlate with total nitrogen (TN) or inorganic nitrogen (InN) contents of soil. Occurrence of weed species was not significantly different among the treatments, whereas weed density was decreased by the incorporation of hairy vetch- or rye-residues. Weed dry weights observed at 50 DAI revealed that the growth of weeds on hairy vetch-incorporated soil was about ten- and four-fold greater than that on rye-incorporated and control soil, respectively. It is concluded that incorporation of hairy vetch did not suppress weed growth, but incorporation of rye significantly suppressed the emergence and growth of weed.</P>
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Water Saving by Shallow Intermittent Irrigation and Growth of Rice
Gun Won, Jong,Soo Choi, Jang,Phil Lee, Seung,Ho Son, Seung,Ok Chung, Sang The Crop Science Society of Japan 2005 Plant production science Vol.8 No.4
<P>To reduce water requirement and improve water productivity (the grain yield per unit volume of water irrigated) by water-saving irrigation techniques, we examined the effects of very shallow intermittent irrigation (VSII, 2cm), shallow intermittent irrigation (SII, 4cm) and traditional deep water irrigation (DWI, 10cm) on rice growth and yield in the field for two years. The amount of water irrigation during the rice-growing period (average of two years) was 318, 391 and 469 mm in VSII, SII and DWI, respectively. Rice growth and grain yield were not significantly influenced by the treatments. As the irrigation water input decreased, the water productivity increased. The water productivity increased by 46 % in VSII and 20 % in SII on the average as compared with DWI. The shallower the irrigation depth, the lower the breaking weight and the higher the lodging resistance, and the deeper the roots in the paddy soil. In DWI, the percentage of head rice was lower and the protein content was higher, suggesting deterioration in the palatability of cooked rice due to the increase of chalky rice. The water-saving rate was 32.9 % in VSII and 17.2 % in SII as compared with typical deep water irrigation in Korea.</P>
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