National Agriculture Res. Cent

Tsukuba, Japan

National Agriculture Res. Cent

Tsukuba, Japan

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Matsuo K.,National Agriculture Res. Cent | Hamaguchi H.,National Agriculture Res. Cent | Watanabe K.,National Agriculture Res. Cent | Watanabe Y.,National Agriculture Res. Cent
Japanese Journal of Crop Science | Year: 2011

In order to clarify the yielding performance of no-tillage seeding cultivation of soybean, the effects of field locations and seeding dates on seedling establishment and yield were studied in the staple cropping area of soybean in Ibaraki pref. for five years by using a newly developed system for recording agricultural works with GPS. The failure of seedling establishment tended to occur only in the poor drainage area that received heavy rain 1-3 days after seeding under the conventional seeding condition. In contrast, the field with poor seedling establishment was observed throughout the surveyed area and irrespective of rainfall under the no-tillage seeding condition. The survey for five years revealed a negative correlation between seeding date and the soybean yield in each field, but there was no significant difference in the regression line between the no-tillage seeding and the conventional seeding. The result of multiple regression analysis showed the importance of phytopthora rot of soybean as a cause of yield loss under the no-tillage seeding condition. The relative yield compensated for yield reduction by delaying seeding was calculated by using regression equation of yield and seeding date. The field map, in which the fields were tilled with different colors according to relative yield, indicated that high-risk fields are distributed into the specific area.


Matsuo K.,National Agriculture Res. Cent | Hamaguchi H.,National Agriculture Res. Cent | Watanabe K.,National Agriculture Res. Cent | Watanabe Y.,National Agriculture Res. Cent
Japanese Journal of Crop Science | Year: 2011

With extending scale of paddy farming in Japan, a handy systematical method for recording agricultural work is required for improving the farming management. From this view point, a hand-held GPS unit was improved to collect the track log of agricultural machine automatically for a long period of time, and software to distinguish the field received machinery work using the track log was developed. Regardless of a slight error due to the GPS and the field map, it was possible to distinguish the field received machinery operation by using log10 (A/T) and D/A (A: area of field (10a); T: staying time of machine in the field (sec); D: moving distance of machine (m)) as predictor variables in the discriminating analysis. The developed recording system consisted of the improved GPS unit and software was tested on four large-scale farms, and it was effective in determining the location of field and the time of operation. By adding more information, i.e., crop species, names of operators, kinds of work, power sources, attachments etc. to the field list obtained from the track log, the daily record of machinery work can be very useful for the large-scale farmer not only to evaluate the management of crop production and the efficiency of machinery operation but also in planning future works. The seeding time and the harvesting time of wheat in the studied area were defined from the track log with the program developed in this study. The relationships between seeding time and harvesting time or duration of time from seeding to harvesting are shown.

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