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Related Experiment Video

Updated: May 1, 2026

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[Dry matter accumulation in rice aboveground part: quantitative simulation].

Yan-Da Li1, Liang Tang, Qing-Chun Chen

  • 1Jiangsu Province Key Laboratory for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China. liyanda2008@126.com

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|September 30, 2010
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Summary

This study developed a dynamic model for rice dry matter accumulation (DMA) using Richards equation. The model accurately predicts DMA based on thermal effectiveness and PAR, aiding in optimizing crop management.

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Area of Science:

  • Agricultural Science
  • Agronomy
  • Plant Physiology

Context:

  • Understanding crop growth dynamics is crucial for optimizing agricultural productivity and resource management.
  • Nitrogen application rates and cultivar differences significantly influence rice (Oryza sativa L.) dry matter accumulation (DMA).
  • Quantitative analysis of DMA temporal characteristics requires robust modeling approaches.

Purpose:

  • To establish a dynamic model for relative dry matter accumulation (RDMA) in rice.
  • To quantitatively analyze the temporal characteristics of DMA changes using normalized DMA and TEP (thermal effectiveness and PAR).
  • To validate the developed RDMA model with independent field experiment data.

Summary:

  • A dynamic model for rice RDMA was established using Richards equation, incorporating normalized DMA and TEP from emergence to maturity.
  • The model, RDMA = 1.0157/(1 +e(3.6329-7.5907xRTEP)) 1/0.5574 (r = 0.9938), was validated with an RMSE of 0.86 t x hm(-2).
  • Dry matter accumulation phases (early, middle, late) were identified based on two inflexion points, with maximum accumulation rate (AR(max)) at 2.24.

Impact:

  • Provides a validated model for predicting rice DMA under various conditions.
  • Enables quantitative analysis of DMA temporal dynamics, aiding in crop management strategies.
  • Identifies key phases of dry matter accumulation for targeted interventions.