Geostatistical Analysis of Spatial Variability of Paddy Rice Nitrogen in Paddy-Upland Rotational Fields for Extension of Precision Agriculture

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  • IKENAGA Sachiko
    The Japanese Society of Agricultural Machinery Corresponding author, Graduate School of Agriculture, Kyoto University
  • GOTO Kei
    Corresponding author, Graduate School of Agriculture, Kyoto University Present address: Ministry of Agriculture, Forestry and Fisheries
  • SUGURI Masahiko
    The Japanese Society of Agricultural Machinery Corresponding author, Graduate School of Agriculture, Kyoto University
  • UMEDA Mikio
    The Japanese Society of Agricultural Machinery Corresponding author, Graduate School of Agriculture, Kyoto University
  • INAMURA Tatsuya
    Corresponding author, Graduate School of Agriculture, Kyoto University

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  • 田畑輪換田における水稲窒素吸収量の空間変動解析

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Abstract

We analyzed the spatial variability of paddy rice nitrogen at the panicle formation stage (Npf) in paddy-upland rotational field (8.6ha) and non paddy-upland rotational field (1.6ha) in Sakurai, Nara Japan. Npf was estimated by GNDVI ((R860-R560)/(R860+R560)) using aerial photography. The variation of Npf had a strong spatial dependence with a range distance of 40-55m in paddy-upland rotational field and 10-30m in non paddy-upland rotational field. Our results showed that the stable management unit of Precision Agriculture for top-dressing, which depend on a range distance, in the paddy-upland rotational field was larger than that in the non-paddy-upland rotational field. The uniformity of the cropping system, the cultivation method and the land utilization among fields influenced these spatial dependences.

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