Japanese Journal of Crop Science
Online ISSN : 1349-0990
Print ISSN : 0011-1848
ISSN-L : 0011-1848
Search
Advanced search
OR
Browse
Search
Volume 77, Issue 4
Displaying 1-23 of 23 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Regular Paper
Agronomy
  • Winter Barley as a Cover Crop Affects the Arbuscular Mycorrhizal Colonization of No-Tillage Soybeans
    Yumi Shimazaki, Tomoko Uchida, Hiroyuki Kobayashi
    2008 Volume 77 Issue 4 Pages 395-402
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.395
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    No-tillage soybean culture using winter barley as a cover crop was developed to control annual summer weeds and reduce labor. With this cover crop system, the soybean yield is higher than with a non-cover crop system, although the mechanism is not clear. One factor of the mechanism is suggested to be the nitrogenous supply from barley residual. This research examined the relationship between the arbuscular mycorrhizal (AM) colonization of barley and soybean. The AM colonization of soybean became greater with the cover crop system. The root length density and the AM colonization of barley became greater when the barley was sown earlier. The AM colonization of deep roots was greater than that of shallow roots. As the barley sowing time became earlier, the AM-colonized root length density of barley, which was derived by multiplying the root length density by the AM colonization rate, became greater. There was a significant correlation between the AM colonization of soybean and the AM-colonized root length of barley at a depth of 0—20 cm. These results suggest that the AM fungi at a depth of 0—20 cm affect the AM colonization of soybean acting as AM fungi inocula.
    View full abstract
    Download PDF (1071K)
  • Effects of Early Sowing on Physical Dough Characteristics and Bread-Making Quality of Bread Wheat Cultivar “Minaminokaori”
    Tetsuya Iwabuchi, Kohei Tanaka, Yuji Matsue, Hitoshi Matsunaka, Suetsu ...
    2008 Volume 77 Issue 4 Pages 403-408
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.403
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The effects of early sowing on physical dough characteristics and bread-making quality of bread wheat cultivar “Minaminokaori” were investigated in Northern Kyusyu. The protein content of flour did not vary with the sowing time, but the sedimentation value and gluten index were lower in early sowing (early November) than in standard sowing (middle-late November). The dough development time, stability, valorimeter value of farinogram and volume-to-weight ratio of loaf were lower in early sowing than in standard sowing, and therefore the physical dough characteristics and bread-making quality in early sowing were inferior to those in standard sowing. Furthermore, glutenin and acetic acid-insoluble glutenin contents were lower in early sowing than in standard sowing. The glutenin content was positively correlated with sedimentation value and acetic acid-insoluble glutenin content was positively correlated with sedimentation value and gluten index. These results suggested that one of the reasons why physical dough characteristics and bread-making quality in early sowing were inferior to those in standard sowing was that glutenin and acetic acid-insoluble glutenin contents in early sowing were lower than those in standard sowing, and therefore the quality of gluten in early sowing was inferior to that in standard sowing.
    View full abstract
    Download PDF (682K)
  • Performances of Dry Matter and Seed Production under Narrow-Row-Dense-Planting Culture of Soybean Cultivar, Sachiyutaka, in South-Western Japan
    Masami Furuhata, Hirohiko Morita, Hiroshi Yamashita
    2008 Volume 77 Issue 4 Pages 409-417
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.409
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Dry matter and seed productivity of Sachiyutaka, an early maturing soybean (Glycine max Merr.) cultivar with a short stem, were investigated under four kinds of interrow spacing (30, 40, 60 and 80 cm) compared with a cultivar, Fukuyutaka under 80 cm of interrow spacing as the conventional culture in south-western Japan. In Sachiyutaka, the numbers of pod and seed per square meter increased by narrow row spaceing of 30 and 40 cm, and consequently, the seed yield was increased by 30 g m-2 compared with Fukuyutaka under conventional culture. The leaf area index (LAI) at flowering time and that at the seed-filling stage greater under narrow-row-dense-planting culture in Sachiyutaka, were as large as 5.0—4.4, which were approximately equivalent to those in Fukuyutaka under conventional culture. In addition, the light extinction coefficient of 50-cm upper layer was low at the seed-filling stage in narrow-row-dense-planting culture, showing excellent light-intercepting characteristics. As a result, maintaining a sufficient level of LAI at the seed-filling stage under the narrow-row-dense-planting condition in Sachiyutaka was considered as a factor to obtain a high seed yield equal to or superior to that in Fukuyutaka under the conventional culture.
    View full abstract
    Download PDF (1418K)
  • Effects of Chitosan Application on Yield of First Crop of Tea
    Masao Ohnishi, Masayuki Kadowaki, Shingo Matsumoto, Ken-ichi Yamane, H ...
    2008 Volume 77 Issue 4 Pages 418-423
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.418
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The effects of chitosan application on the yield of the first crop of tea cultivars 'Asatuyu' and 'Yabukita' were investigated for 2 years from 2004 to 2005. In 2002 and 2003, yields of the first crop and autumn crop among plots were examined without chitosan application. The yield differences among plots were not significant. In 2004 and 2005, a chitosan solution was applied to tea plants by foliar spray of 2000 L ha-1 in spring each year. In 'Asatuyu', the yield of the first crop before chitosan treatment was slightly superior to that of control plot, and that after chitosan treatment was significantly higher than that of the control plot. In 'Yabukita', the yield of the first crop before the chitosan treatment was slightly inferior to that of the control plot, and that after chitosan treatment was similar to that of the control plot. There was a negative relationship between the autumn crop yield and the first crop yield in the next spring in both cultivars. These negative relationships tend to be improved slightly by chitosan application. These results suggested that chitosan application slightly increased the yield of the first crop.
    View full abstract
    Download PDF (842K)
Quality and Processing
  • Effect of the Amount of Nitrogen Application on Occurrence of White-back Kernels during Ripening of Rice under High-temperature Conditions
    Ken-ichi Wakamatsu, Osamu Sasaki, Ichiro Uezono, Akio Tanaka
    2008 Volume 77 Issue 4 Pages 424-433
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.424
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The effect of the amount of nitrogen application on the occurrence of white-back kernels was examined in rice grown in warm areas. White-back kernels occurred when the average temperature during ripening 20days after heading was 27°C or higher, especially at 28°C or higher temperature. At 28°C or lower temperature, white-back kernels tended to decrease with the increase in amount of nitrogen application. A negative correlation was found between the protein content (nitrogen content) of brown rice and the occurrence of white-back kernels. The preferred protein content of brown rice was estimated to be 6.0-7.0%considering the palatability because the occurrence rate of white-back kernels increased when protein content of brown rice was less than 6.0%, whereas palatability dropped when it was greater than 7.0%. At temperatures higher than 28°C, white-back kernels occurred frequently in cultivars such as Hatsuboshi and Hinohikari, whose ripening are "sensitive" to high temperatures, showing little suppressive effect of the increase in the nitrogen contents of brown rice, on the occurrence of white-back kernels. Thus, it is difficult to decrease the occurrence of white-back kernels at temperatures higher than 28°C merely by increasing the amount of nitrogen application in these cultivars. Thus, introduction of cultivars resistant to high temperatures during ripening is also necessary to reduce white-back kernels.
    View full abstract
    Download PDF (1128K)
  • Effects of the Period of the Ventilation on Occurrence of "Chalky Grains" in Rice
    Kazuhiko Oya, Tomohiko Yoshida
    2008 Volume 77 Issue 4 Pages 434-442
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.434
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Factors of occurrence of chalky grains including milky white rice grains, white-based rice grains and white-back grains in rice, were studied. From the analysis of the relationship with the percentage of first class grade rice produced in Tochigi prefecture, the weather conditions and the growth of rice, the factors causing occurrence of chalky grains in rice were found to be the saturation deficit and ventilation from 6 to 25 days after heading, the temperature for 20 days before and after heading, the daylight hours for 30 days before heading, and the number of spikelets per panicle. When kept under ventilation for 6-10 days after heading, white-based rice grains and white-back rice grains occurred in every position on the panicle. On the other hand, when kept under ventilation for 21-25 days after heading, milky white rice grains occurred on the primary rachis-branch at top and medium positions. The rate of chalky grains was high on inferior spikelets. The rate of chalky grains in rice could be estimated from the mean temperature from 0 to 20 days after heading and [(100-minimum humidity)×maximum wind velocity] from 6 to 25 days after heading. The occurrence of chalky grains varied with the cultivar.
    View full abstract
    Download PDF (1816K)
  • Estimation of Starch Digestion Pattern and Glycemic Index of Rice by Near Infrared Refrectance Spectroscopy
    Minoru Osawa, Naoto Inoue
    2008 Volume 77 Issue 4 Pages 443-448
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.443
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Near-infrared reflectance spectroscopy (NIRS) was applied to develop a conventional method for estimating the glycemic index (GI) and starch digestion pattern with α-amylase of brown-rice flour. The digestion pattern was expressed by a non-linear equation including 3 parameters, "parameter a" that expresses the digestible fraction by prepared heat treatment, "parameter b" t hat expresses the amount of digestible fraction during digestion trials, and "parameter c" that expresses the starch hydrolysis rate. The GI value was expressed by the EGI obtained from the in vitro starch digestion trial. The accuracy of the validation was evaluated by the evaluation index and the ratio of standard deviation of reference data in prediction sample set to the standard error of prediction. The results of validation showed that the estimation method by NIRS was useful to estimate the value of "parameter c" and EGI and for primary screening of the varieties in the rice breeding system, suggesting that it was useful to select the rice varieties having a lower rate of starch digestion. The results also suggested that the sample segregation by the rice subspecies or production region was useful to improve the accuracy of estimation.
    View full abstract
    Download PDF (807K)
  • Relationship between Yellow Alkaline Noodle Quality and Flour Properties in Hard Wheat Varieties in the Central Region of Japan
    Masaya Fujita, Masako Seki, Hitoshi Matsunaka, Chikako Kiribuchi-Otobe ...
    2008 Volume 77 Issue 4 Pages 449-456
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.449
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Quality of yellow alkaline noodle (YAN) made from hard wheat varieties and breeding lines in Central Region of Japan was evaluated by sensory assessment. The effects of protein content, amylose content, and dough properties on YAN quality were investigated using Japanese hard wheat. Protein content was highly correlated with noodle color, and the color of noodles made from white seed varieties was superior to that of noodles made from red seed varieties. Thus the seed color is one of the important factors for YAN quality. The texture of noodles made from low amylose type varieties was very smooth. This texture is useful for new noodle products. The hardness and elasticity of noodles after immersion in soup for 8 minutes, which are important determinants of YAN quality, were highly correlated with protein contents, farinogram characteristics and noodle cutting stress. The quality of YAN made from the wheat with strong dough property was superior to that made from other varieties. Therefore YAN quality of Japanese hard wheat can be improved by genetically introducing high-molecular-weight-glutenin subunits which effectively strengthen the dough property (e. g. Glu-D1d, 5+10 subunit).
    View full abstract
    Download PDF (816K)
  • Effect of Seed Moisture Fluctuation after Maturation on Development of Soybean Seed with Tortoiseshell-pattern Wrinkles
    Toru Sato, Makoto Hattori, Takafumi Ichikawa, Takao Tamura
    2008 Volume 77 Issue 4 Pages 457-460
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.457
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The relationship between seed moisture fluctuation and development of seed with tortoiseshell-pattern wrinkles in a standing soybean plant was investigated. When the seed absorbed moisture after being dried to achieve a single seed moisture level of 13% or below, the seed coat became detached from the cotyledon. The moisture absorption rate of the seed coat immediately after moisture absorption was faster than that of the cotyledon. Subsequent repeated drying and moistening conditions caused repeated development and loss of tortoiseshell-pattern wrinkles, and the wrinkles gradually increased. These results suggested that when a seed absorbed moisture after being dried to achieve a single seed moisture level of 13% or below, the seed coat became detached from the cotyledon because of the difference in moisture absorption rates between the seed coat and cotyledon. Thus, it was assumed that further absorption of moisture caused development of tortoiseshell-pattern wrinkles. After that, although wrinkles temporarily disappeared in some seeds due to dryness during daytime, additional moisture, such as night-time dew, caused reappearance of tortoiseshell-pattern wrinkles. Subsequent repeated drying and moistening conditions caused repeated development and depletion of tortoiseshell-pattern wrinkles, leading to the loss of seed coat elasticity and establishment of permanent tortoiseshell-pattern wrinkles. These results imply the importance of harvesting plants immediately after seed maturation to prevent development of tortoiseshell-pattern wrinkles.
    View full abstract
    Download PDF (1051K)
Genetic Resources and Evaluation
  • Yield Ability of Rice Cultivar Oochikara and its Short-root Near Isogenic Line IL-srt1
    Rengui Zhao, Fumitaka Shiotsu, Jian Liu, Masanori Toyota, Masahiro Mor ...
    2008 Volume 77 Issue 4 Pages 461-466
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.461
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The effect of a short root characteristic of rice plant on yield was investigated by comparing the yield and yield components of cultivar Oochikara with those of IL-srt1, a short root near isogenic line derived from Oochikara. The percentage of the yield in IL-srt1 (507g/m2) to that in Oochikara (745g/m2) was 68%. The percentage of ear number, number of grains per head, percentage of ripened grains and 1000 grain weight in IL-srt1 were 91%, 100%, 80%, 95% of those in Oochikara, respectively. Low yield ability of IL-srt1 was mainly attributed to a low percentage of ripened grains. The percentage of fertilized grains and that of fully ripened grains, which are components of the percentage of ripened grains in IL-srt1 were 74% and 108% of those in Oochikara, respectively. Although the percentage of fertilized grains in IL-srt1 was lower than that in Oochikara, the percentage of fully ripened grains to fertilized grains in IL-srt1 was higher than that in Oochikara. These results imply that the low yield ability of IL-srt1 is attributed to the effect of the short-root gene of IL-srt1, which reduces the percentage of ripened grains by decreasing the percentage of fertilized grains.
    View full abstract
    Download PDF (833K)
Crop Morphology
  • Influence of Early Sowing on Pattern of Floret Differentiation on Developing Spikes of Wheat Cultivars in Yamaguchi
    Li Zhang, Tadashi Takahashi, Tomohiko Mastuzawa, Kana Fujimoto, Shinji ...
    2008 Volume 77 Issue 4 Pages 467-473
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.467
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Pattern of floret differentiation at each spikelet position of developing spikes of nine wheat cultivars was investigated in three successive growing seasons, from 1999 to 2002 in Yamaguchi. The results obtained by early sowing were compared with those obtained by standard sowing. These cultivars had different degrees of winter habit and were raised in different districts. This experiment was done to determine the change in spikelet number caused by early sowing in these cultivars. The florets differentiated earlier at the center than at the base or tip of the developing spike in standard sowing in all cultivars. In early sowing, they also differentiated earlier at the center of the spikelet in spring habit and strong winter habit cultivars. On the other hand Iwainodaichi and Airakomugi, the mild winter habit cultivars bred in Kyushu and Kanto districts differentiated florets earlier at the tip than at the center or base of spikelets in early sowing. The spikelet numbers per spike were larger in early sowing than in standard sowing in Iwainodaichi and Airakomugi in all three seasons, while they were smaller in early sowing than in standard sowing. Nevertheless, in Iwainodaichi and Airakomugi, the kernel number was smaller at the tip than at the center of the spikelet in early sowing, even though the florets differentiated earlier at the tip than at the center of the spikelets.
    View full abstract
    Download PDF (1281K)
Crop Physiolory and Cell Biology
  • Yield, Dry Matter Production and Ecophysiological Characteristics of Rice Cultivar, Habataki Compared with cv. Sasanishiki
    Shunsuke Asanuma, Naoko Nito, Taiichiro Ookawa, Tadashi Hirasawa
    2008 Volume 77 Issue 4 Pages 474-480
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.474
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In the marker-assisted selection for breeding high-yielding rice, the target traits need to be identified and characterized. Habataki, identified as an indica type and high-yielding cultivar, has been employed in the research for analyzing quantitative trait loci (QTL). In this study, we investigated ecophysiological characteristics contributing to the high grain yield of Habataki compared with Sasanishiki (japonica type). Grain yield was 60—120g m-2 higher in Habataki than in Sasanishiki due to a significantly higher harvest index. Habataki showed a higher crop growth rate (CGR) during the period from the booting to the early ripening stages, which might contribute in part to the higher harvest index in Habataki. Habataki had a higher photosynthetic rate in the morning and maintained a higher rate in midday and afternoon, which might be attributed to the higher CGR during early ripening. Habataki had longer roots with larger surface area and, therefore, lower resistance to water transport from root to leaf than Sasanishiki, which might be attributed to the maintenance of higher photosynthetic rate until afternoon. It would be useful for improving grain yield to identify the QTL related to the high photosynthetic rate and water transport capacity of Habataki, and introduce it into the japonica-type rice.
    View full abstract
    Download PDF (989K)
  • Effects of Plant Growth Regulators, Light Conditions and Culture Media on Multiple Shoot and Microtuber Formation in the Tissue Culture of Ise-imo (Dioscorea opposita)
    Takanari Sakai, Katsu Imai
    2008 Volume 77 Issue 4 Pages 481-488
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.481
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    We obtained the microtubers of Ise-imo from the multiple shoots formed by the tissue cultures of shoot-tip and node explants with solid or liquid MS medium. Shoot-tip explants cultured with benzyladenine (0.1—2 mg L-1 ; BA) and naphthalene acetic acid (0.1—0.5 mg L-1), or node explants cultured with BA (0.1—5 mg L-1) differentiated multiple shoots. Multiple shoots were maintained on a medium with 5 mg L-1 BA and their growth occurred on the subculture medium without plant growth regulators. Although microtubers were formed immediately after the addition of jasmonic acid (JA), they were formed without JA after a substantial time lag. More microtubers were formed in the dark than in the light but their enlargement was vice versa. Obtained microtubers (heavier than 120 mg FW) could be used successfully for the ordinary cultivation after storage in a refrigerator at 8°C for one month.
    View full abstract
    Download PDF (1816K)
Modelling, Information and Environment
  • Impact of Global Warming on Yield Fluctuation in Rice in the Northern Part of Japan
    Hiroyuki Shimono
    2008 Volume 77 Issue 4 Pages 489-497
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.489
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Accurate prediction of rice yield under the future climate is a critical factor for future food security. I evaluated the impact of global warming on rice yield fluctuation especially in cool climates using (1) air temperature trend, (2) rice yield trend and (3) a simple model. Annual averaged air temperature has been rising at a rate of 0.2°C per 10 years, but the magnitude differed with the season. The increase in air temperature in summer tended to be slight especially in the northern part of Japan. Yield of rice cultivar, Sasanishiki grown under identical management practices, was increasing at a rate of 16 g m-2 per 10 years, but yearly fluctuation tended to increase in recent years. The impact of further global warming on the cooling-degree day, that is, the chance of coldness in the panicle formation stage, was estimated under two climate scenarios. Under scenario 1 (air temperature rises uniformly over the season), the chance of coldness in the panicle formation stage was reduced similar to previous predictions, but under scenario 2 (air temperature rises only in spring), the change was expected to increase by 16% per 1°C rise. The trend of recent temperature increase in spring may increase the risk for cold damage in rice in the northern part of Japan, suggesting the necessarily of selecting suitable varieties and planting season.
    View full abstract
    Download PDF (1300K)
  • Relative Amount and Physiological Activity of Roots Affect the Resistance to Cool Weather at the Young Microspore Stage through the Number of Pollen Grains in Rice Plants
    Zujian Zhang, Teiji Nakamura, Makie Kokubun, Iwao Nishiyama
    2008 Volume 77 Issue 4 Pages 498-504
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.498
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The relative amount of roots (dry weight ratio of root to shoot, or root dry weight per spikelet) or the physiological activity of roots is correlated with the cool-weather resistance in rice plants. The objective of this study is to elucidate the effects of the relative amount or physiological activity of roots on the number of pollen grains (NPG) which are generally considered to be closely related with the cool-weather resistance. NPG in the anthers excised from the spikelets just before flowering, was counted using the same plant materials as described in our previous reports. NPG was lower at the higher levels of nitrogen application in both the control and cooled plants. The fertility of the cooled plants tended to decrease with decreasing NPG. NPG tended to decrease with decreasing relative amount of roots, which had already been shown to decrease with increasing nitrogen level. Moreover, NPG was decreased in both the cooled and control plants by root cutting or treatment of roots with a respiratory inhibitor, and was positively correlated with the fertility. These results strongly suggest that the development and activity of roots affect the cool-weather resistance through pollen formation, and that one of the reasons why the cool-weather resistance is decreased by the higher levels of nitrogen application is the decrease of NPG due to the lowering of the relative amount of roots.
    View full abstract
    Download PDF (1375K)
Research and Technical Note
  • Lodging-related Characteristics of Hikari-Shinseiki, an Isogenic Variety of Koshihikari
    Reinosuke Ida, Motonori Tomita
    2008 Volume 77 Issue 4 Pages 505-510
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.505
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Hikari-Shinseiki, a variety registered in 2004, is an isogenic variety of Koshihikari which has the semidwarfing gene sd1 derived from variety Jikkoku. In this study, we examined lodging-related characteristics of Hikari-Shinseiki, which is presumed to be hard to lodge because of its short culm, under conditions of compost application. Hikari-Shinseiki is a short-culm variety with longest culm length 19 cm shorter, and average culm length 14 cm shorter than Koshihikari. The breaking load of the fourth internode of Hikari-Shinseiki at 26-30 days after heading was comparable to that of Koshihikari. At the same time, the bending moment (length·weight above the internode where the breaking load is measured) of Hikari-Shinseiki was smaller than that of Koshihikari, showing the impact of the reduction in the top length attributable to the shorter culm. Consequently, the lodging index(bending moment·breaking load-1·100) of Hikari-Shinseiki was 127-100, which was smaller than that of Koshihikari 173-148. The degree of lodging on a scale of 0 (none) to 4 (severe) of Hikari-Shinseiki in the field at the time of harvest was 1.1, which was smaller than that of Koshihikari 2.6 and well consistent with the breaking load values. These results revealed that the lodging resistance of Hikari-Shinseiki is primarily attributable to the reduced bending moment, and to the strength of the fourth internode counted from the first panicle neck internode.
    View full abstract
    Download PDF (796K)
  • Relationship of Growth Variability, with Ground Level and Soil Water Content in a Large Paddy Field in Inashiki-city, Ibaraki-prefecture in 2007
    —Wet Injury of Wheat—
    Atsushi Oyanagi
    2008 Volume 77 Issue 4 Pages 511-515
    Published: 2008
    Released on J-STAGE: November 01, 2008
    DOIhttps://doi.org/10.1626/jcs.77.511
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    There was a heavy rain fall on Nov. 19-20 and Dec. 26-27, 2006 in Ibaraki-prefecture. We examined wheat growth and soil conditions in a large paddy field in Inashiki-city, Ibaraki-prefecture, where poor emergence and large variability of growth were observed. Eighty observation points were set in the field and the ground level, plant density and soil water content were measured on Jan. 14, 2007. Plant density was low at the points where the ground level was low and soil water content was high. Moreover, a negative correlation was found between soil water content and plant height at the late growth stage and a positive correlation was obtained between plant height and grain yield. Low ground points tended to have high soil water contents throughout the wheat growth period.
    View full abstract
    Download PDF (1441K)
Mini Review
Information
Mini Symposium
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top