Self-sustaining nitrogen supply system in long-term unfertilized paddy-field

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Fertilization including both chemical and organic forms is essential for sustainable crop production. However, several paddy field farmers in Japan successfully attain high yield without any fertilization for more than 30 years. To clarify this mechanism, six paddy rice fields in Tohoku region were compared in terms of nitrogen balance.Tillering activity during vegetative growth stage was a key component in regulating rice field. High-yield paddy fields had higher ability to supply mineralized nitrogen resulting from high soil decomposing activity than low-yield fields.