Rice Quality and Yield Prediction Based on Multi-Source Indicators at Different Periods.

Abstract

This study aims to develop an effective and reliable method for estimating rice quality indices and yield, addressing the growing need for rapid, non-destructive, and accurate predictions in modern agriculture. Field experiments were conducted in 2018 at the Suiling Water Conservancy Comprehensive Experimental Station (47°27' N, 127°06' E), using Longqingdao 3 as the test variety. Measurements included the leaf area index (LAI), chlorophyll content (SPAD), leaf nitrogen content (LNC), and leaf spectral reflectance during the tillering, jointing, and maturity stages. Based on these parameters, spectral indicators were calculated, and univariate linear regression models were developed to predict key rice quality indices. The results demonstrated that the optimal R 2 values for brown rice rate, moisture content, and taste value were 0.866, 0.913, and 0.651, with corresponding RMSE values of 0.122, 0.081, and 1.167. After optimizing the models, the R 2 values for the brown rice rate and taste value improved significantly to 0.95 (RMSE: 0.075) and 0.992 (RMSE: 0.179), respectively. Notably, the spectral index GM2 during the jointing stage achieved the highest accuracy for yield prediction, with an R 2 value of 0.822. These findings confirm that integrating multiple indicators across different growth periods enhances the accuracy of rice quality and yield predictions, offering a robust and intelligent solution for practical agricultural applications.

Plant phenotyping relevance

複数時期の葉面・スペクトル指標からイネの収量および品質を推定する予測手法を開発・最適化しており、形質推定ワークフローが研究の中心である。

Code and data availability

The article describes rice quality/yield prediction from spectral and physiological measurements, but no public phenotype dataset, images, author code, models, or supplement with data are mentioned. No data or code availability statement appears in the supplied blocks, and no paper-specific public asset URL is present.

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