Modelling the effect of nitrogen on rice growth and development

  • T. Hasegawa
  • T. Horie
Part of the Systems Approaches for Sustainable Agricultural Development book series (SAAD, volume 6)


A dynamic crop growth model was developed to analyse irrigated paddy rice (Oryza saliva L.) productivity as determined by climatic factors and N availability. The model consists of submodels related to soil N processes, rice N-uptake, developmental processes, photosynthesis, dry matter production and spikelet formation. Soil N processes include N mineralization, expressed as a function of temperature and soil moisture before flooding. The balance between soil N supply and crop N demand determines rice N-uptake. The phenological developmental rate was expressed as a non-linear function of daily temperature and daylength. Submodels for canopy photosynthesis and dry matter production were based on an age-dependent relation between single-leaf photosynthesis and leaf N. Spikelet number was determined by an empirical function of dry weight and N concentration of above-ground biomass at the panicle formation stage, which was derived from a number of field experiments conducted in widely different regions in Japan. Data sets covering a range of N and climatic conditions were used for validation. The model, written in BASIC for PCs, satisfactorily simulated daily biomass growth and final spikelet number with inputs of latitude, N fertilizer input and daily climatological data, and might be useful for evaluation of N fertilizer management scenarios over sites and seasons.

Key words

dry matter nitrogen Oryza sativa L. simulation model soil N supply spikelet number 


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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • T. Hasegawa
    • 1
  • T. Horie
    • 2
  1. 1.School of AgricultureKyushu Tokai UniversityChoyo, Aso-gun, KumamotoJapan
  2. 2.Faculty of AgricultureKyoto UniversitySakyo-ku, Kyoto 606Japan

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