Optimizing phenological nitrogen status for synergistic improvement of rice grain yield and eating quality
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View abstract on PubMed
Summary
This summary is machine-generated.Optimized nitrogen fertilizer management using integrated NNI improves rice yield and eating quality. Accumulated integrated NNI from transplanting to jointing is a reliable predictor for precision farming.
Area Of Science
- Agronomy
- Plant Nutrition
- Precision Agriculture
Background
- Optimizing nitrogen (N) fertilizer is crucial for enhancing rice grain quality without sacrificing yield.
- Phenological N status indicators are explored for predicting rice yield and eating quality.
- Field experiments were conducted over three years with two indica rice cultivars and varied N application rates.
Purpose Of The Study
- To evaluate the effectiveness of phenological N status in predicting rice grain yield and eating scores.
- To provide data-driven recommendations for N fertilizer management in rice cultivation.
- To investigate the correlation between N diagnostic indicators and rice performance metrics.
Main Methods
- Utilized nitrogen nutrition index (NNI) and integrated NNI (NNI<sub>inte</sub>) derived from critical N dilution curves (CNDCs).
- CNDCs were based on shoot dry matter (DM) and leaf area index (LAI).
- Correlated N indicators with relative yield (RY) and relative eating score (RE) across different growth stages.
Main Results
- NNI and NNI<sub>inte</sub>, based on DM and LAI CNDCs, showed significant correlations with RY and RE.
- Accumulated NNI<sub>inte</sub> (transplanting to jointing) provided better estimation of RY and RE than single-stage indicators.
- Leaf Area Index-based CNDC offered comprehensive and accurate estimation of RY and RE.
Conclusions
- The study highlights the potential of NNI<sub>inte</sub> as a diagnostic tool for estimating rice yield and eating quality in precision agriculture.
- NNI<sub>inte</sub> can effectively determine N requirements for achieving high yield and superior quality in rice.
- Recommended optimal N fertilizer application rate: 126-209 kg ha<sup>-1</sup> for high yield and good eating quality.
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