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Volume 51 (2016)
- Issue 4 Pages 131-
- Issue 3 Pages 101-
- Issue 2 Pages 39-
- Issue 1 Pages 1-
Volume 51, Issue 1
Displaying 1-4 of 4 articles from this issue
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Original Paper
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Masahiko Tanio, Kunio Tateishi, Kou Nakazono, Kazuhiro Watanabe2016 Volume 51 Issue 1 Pages 1-10
Published: 2016
Released on J-STAGE: October 25, 2016
DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4035/jsfwr.51.1JOURNAL FREE ACCESSTo develop an indicator of the start of internode elongation in wheat (Triticum aestivum L.) in the warmer regions of Japan, we analyzed the relationships between apical development stage, stem length, and pseudostem length (from the ground to the lamina joint of the uppermost unfolded leaf) in five spring and winter cultivars in the warmer Tokai region of Japan. The time course of apical development differed among cultivars: the winter cultivars reached the double ridges stage (the transition from vegetative to reproductive development) and the following floret differentiation stage later than the spring cultivars in early sowing. Apical development stage was closely related to both stem length and pseudostem length. Internode elongation started at the floret differentiation stage in all cultivars, when the pseudostem length was ca. 5 cm in all cultivars. The present study indicated that pseudostem length is useful as an indicator of the start of internode elongation in wheat cultivation in the warmer regions of Japan.View full abstractDownload PDF (1088K)
Research paper
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Tasuku Shimizu, Kuninori Matsunaga, Atsuko Uragami, Kazuki Tsuge, Taka ...2016 Volume 51 Issue 1 Pages 11-22
Published: 2016
Released on J-STAGE: October 25, 2016
DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4035/jsfwr.51.11JOURNAL FREE ACCESSWe have developed a new hole-maker to plant plug seedlings (grown in cell tray) directly in fields instead of larger pots. In the present study on the forcing cultivation of asparagus, a survey was conducted to examine increases in the efficiency of planting plug seedlings directly in fields using the above-mentioned hole-maker (new method), when compared to the efficiency of planting pot seedlings using a conventional hole-maker (conventional method), and assess the growth amount- an index of the yield. The time required for both inexperienced and experienced growers to plant asparagus using the new method was significantly shorter than that based on the conventional method. Postures during planting were also assessed using an OWAS method based on the frequency and rate of action categories (AC), and the level of improvement in the postures of experienced growers while planting asparagus using the new method was significantly higher compared to when the conventional method was adopted. While there was no increase in the frequency of AC when asparagus was planted by inexperienced growers, there was an increase in the number of AC. A shorter time was required to plant asparagus, which suggests that the burden of planting using the new method on inexperienced growers is less than that when the conventional method is used. Although the plug seedlings used for the new method were smaller than the pot seedlings used for the conventional method, there were no significant differences in the growth amount of root stock between the two methods in autumn. Therefore, the same asparagus yield can be obtained using the new method and conventional method.View full abstractDownload PDF (1416K) -
Kou Hatakenaka, Mayuko Okabe, Shigemitsu Kasuga2016 Volume 51 Issue 1 Pages 23-30
Published: 2016
Released on J-STAGE: October 25, 2016
DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4035/jsfwr.51.23JOURNAL FREE ACCESSSoil enrichment methods are needed because of damage caused by continuous cropping on the Nobeyama plateau. Sorghum green manure is useful from the perspectives of soil improvement and the short cultivation period. We considered a suitable plowing-in time on using sorghum green manure in highlands from the viewpoints of the working efficiency, amount of sorghum when plowing-in, degree of decomposition, and the yield of succeeding cabbage crops. The experiment was carried out in three plots with different plowing-in times of sorghum. The sorghum variety ‘TSUCHITARO’ was seeded on June 7, 2010. The plowing-in times were the 46th day, 78th day, and 122nd day after seeding. On the 78th and 122nd days, the working efficiency on plowing-in was inefficient. Furthermore, mulching of the field was troublesome on the 122nd day. The sorghum dry weight per unit area was lightest on the 46th day, and there were no significant differences between the 78th and 122nd days. However, the decomposition rate of the 122nd day’s plowing sorghum was slower than the 78th day’s. The 122nd day’s sorghum dry-matter percentage was higher than the 78th day’s. The yield of succeeding cabbage crops was the highest on the 46th day’s plowing in all cropping seasons. On the 78th day’s plowing, growing delay occurred in cropping seasons using the cabbage cultivar “SINSHU868”, but the average cabbage weight reached the shipping standard. On the other hand, the average cabbage weight for the shipping standard wasn’t reached in the cropping seasons using “TERUYOSI”; therefore, the growth delay was more marked. On the 122nd day’s plowing, the average cabbage weight for the shipping standard wasn’t reached in all cropping seasons because of delayed enlargement in head formation. From these results, 46 days after seeding was more suitable as a plowing-in time than at 78 and 122 days.View full abstractDownload PDF (945K)
Material
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Joe Nakai2016 Volume 51 Issue 1 Pages 31-34
Published: 2016
Released on J-STAGE: October 25, 2016
DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4035/jsfwr.51.31JOURNAL FREE ACCESSDownload PDF (673K)
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