Japanese Journal of Soil Science and Plant Nutrition
Online ISSN : 2424-0583
Print ISSN : 0029-0610
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Volume 89, Issue 6
Displaying 1-39 of 39 articles from this issue
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Reviews of growing problems regarding crop production under climate change and technologies for adaptation
Original Paper
  • Use of remote-sensing data on soil nitrogen availability and wheat growth to estimate factors that affect within-field variation in wheat growth
    Katsuhisa Niwa, Jun Yokobori, Keisuke Hara, Nobuhiko Fueki, Masashi Wa ...
    2018 Volume 89 Issue 6 Pages 544-551
    Published: December 25, 2018
    Released on J-STAGE: December 15, 2018
    DOIhttps://doi.org/10.20710/dojo.89.6_544
    JOURNAL FREE ACCESS
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    Variable-rate fertilizer application in upland fields in the Tokachi region of Hokkaido, Japan, is determined based on wheat growth maps generated by the crop growth sensor “CropSpec” and hot-water extractable nitrogen (HWEN) maps estimated from bare soil images obtained from an unmanned aerial vehicle (UAV). Here, we applied these remote-sensing techniques to two Andosol fields (A and B) to examine the relationship between the distribution of wheat growth and HWEN at the field scale (30-m resolution) in order to evaluate which factors affect within-field variation in wheat growth.

    In field A, the estimated HWEN ranged from 50 to 100 mg kg−1 and was significantly positively correlated with the sensor value of wheat growth (SV) (R2=0.28, p<0.01). In field B, the estimated HWEN ranged from 75 to 134 mg kg−1 and was significantly positively correlated with SV in the area where it was <115 mg kg−1 (Area 1; R2=0.24, p<0.01). However, there was no correlation between the estimated HWEN and SV in areas with ≥115 mg kg−1 HWEN (Area 2). In addition, the average SV was lower in Area 2 than in Area 1, suggesting that crop growth in Area 2 was affected by factors other than nitrogen fertility.

    These results suggest that soil nitrogen fertility has variable effects on wheat growth in Andosol fields in the Tokachi region. Therefore, clarification of this relationship is important to ensure effective variable-rate fertilizer application in this area.

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