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Volume 46 (2011)
- Issue 4 Pages 159-
- Issue 3 Pages 87-
- Issue 2 Pages 49-
- Issue 1 Pages 3-
Volume 46, Issue 2
Displaying 1-3 of 3 articles from this issue
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Original Papers
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Taku KATO, Masaharu IKEBA, Masayuki TANI2011 Volume 46 Issue 2 Pages 49-57
Published: March 20, 2011
Released on J-STAGE: December 20, 2011
DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4035/jsfwr.46.49JOURNAL FREE ACCESSThe purpose of this study was to clarify the influence of the amounts of inorganic nitrogen and degradable organic nitrogen on nitrogen use efficiency of chemical fertilizer. In this experiment, Chinese cabbage (Brassica rapa) and carrot (Daucus carota) were grown in Andosol soils, and the absorption of nitrogen by the plants was investigated using 15N tracer techniques. Positive correlations between chemical fertilizer 15N and the amount of 15N absorbed were observed in Chinese cabbage but not in carrot. 14N was absorbed together with 15N in Chinese cabbage ; however, this relation was not shown in carrot plants. Nitrogen use efficiency of chemical fertilizer were 53-88% and 4-57% for Chinese cabbage and carrot, respectively, showing wide range of fluctuation in both crops. There was no relationship between the nitrogen use efficiency of chemical fertilizer and the amounts of inorganic nitrogen or phosphate buffer exchangeable organic nitrogen in the soil. It became clear from these findings that the amount of inorganic nitrogen and phosphate buffer exchangeable organic nitrogen cannot serve as a predictor of the nitrogen use efficiency of chemical fertilizer.View full abstractDownload PDF (936K) -
Hiroyuki TSUJI, Noriyuki MURAKAMI, Keita SUGIYAMA, Tomoko SUGITO, Dais ...2011 Volume 46 Issue 2 Pages 59-67
Published: March 20, 2011
Released on J-STAGE: December 20, 2011
DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4035/jsfwr.46.59JOURNAL FREE ACCESSIt is not necessary to pinch off the main stems of the short-internode squash cultivar ‘TC2A’ after planting. The fruit yield of densely planted ‘TC2A’ is higher than that of standard high-yielding cultivars. The objective of this study was to determine labor saving is possible by using a transplanting machine and plug seedlings for densely planted ‘TC2A’.
1) The labor hours for transplanting using plug seedlings with a hand planter was 5.92 hours per 10a, which was about 43% less than that required for transplanting using conventional pots.
2) The labor hours for transplanting using plug seedlings with a transplanting machine was 3.85 hours per 10a, including 0.84 hours for transplanting, 0.34 hours for supplying seedlings and 2.59 hours for seedling adjustment.
3) The fruit yield in the plot using plug seedlings and machinery transplanting was the same as that in the plot using conventional pot transplanting.
4) Rates of vacant hills were less than 2% in the plot using machinery transplanting without seedling adjustment after transplanting. Increase of vacant hills reduced the number of harvested fruits, but the weight of harvested fruits in the plot with less than 10% vacant hills was not significantly decreased.
5) In conclusion, transplanting using plug seedlings can save labor hours for ‘TC2A’ production. Labor hours were shortest when a transplanting machine was used, and seedling adjustment after transplanting was not necessary.View full abstractDownload PDF (834K) -
Daisuke KAMI, Noriyuki MURAKAMI, Tomoko SUGITO, Keita SUGIYAMA, Hiroyu ...2011 Volume 46 Issue 2 Pages 69-74
Published: March 20, 2011
Released on J-STAGE: December 20, 2011
DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4035/jsfwr.46.69JOURNAL FREE ACCESSTo determine appropriate fruit and plant characteristics for harvesting winter squash, the time to pick fruits was measured in three cultivars representing different plant types. In ‘Bush Buttercup’ and ‘TC2A’, almost fruits were developed in 45cm distance from the base of a plant body. Especially, ‘Bush Buttercup’ has a short main stem and less lateral shoots as other two cultivars. This plant shape in ‘Bush Buttercup’ would make it possible that harvesting worker could find fruits easily and harvest those fruits in short time. Moreover, since the peduncle of ‘Bush Buttercup’ was thin, it was easier to separate the fruit from the plant. The results from this study indicate that improvements in breeding are necessary to stabilize the position of fruit set and the thickness of the peduncle for easy fruit harvest.View full abstractDownload PDF (621K)
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