2024年8月1日 · Independent test results indicated that the nitrogen nutrition index (NNI), calculated from this curve, effectively identifies and quantifies the two sources of N deficiency: insufficient N supply in the soil and insufficient soil water concentration leading to decreased N availability for root absorption.

2023年4月1日 · Simple and multiple linear models fitted for the relationship between relative grain yield (rGY), N nutrition index (NNI), and leaf/stem ratio for N concentration (%N L /%N S ratio), for low and high crop biomass (W) levels.

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2021年9月1日 · The nitrogen nutrition index (NNI) is a reliable indicator for diagnosing crop nitrogen (N) status. However, there is currently no specific vegetation index for the NNI inversion across multiple growth periods.

Relative grain yields of winter wheat and rapeseed were calculated by dividing the grain yield from a given fertilization treatment by the grain yield from the PK treatment. The dashed horizontal...

Critical SNI and its confidence interval (CI, gray vertical trips) were estimated for 95% of RGY with a 95% confidence level following the modified Arcsine–Logarithm Calibration Curve (ALCC)...

This study aimed to perform a cross-species comparison of the relationship between NNI and yield with emphasis on the yield sensitivity to N deficiency, slope of the models. Additionally, we conducted an evaluation to determine the best NNI sampling moment to predict relative yield,

2023年3月21日 · Background and objective: The rapid diagnosis of rice nitrogen nutrition is of great significance to rice field management and precision fertilization. The nitrogen nutrition index (NNI) based on the standard nitrogen concentration curve is a common parameter for the quantitative diagnosis of rice nitrogen nutrition.

Chlorophyll meters (CM) such as SPAD-502 (Konica Minolta, Tokyo, Japan) and Hydro N-Tester (Minolta, Japan) can be used to estimate the relative chlorophyll content and estimate the NNI value ...

The nitrogen nutrition index (NNI) is a reliable indicator for diagnosing crop nitrogen (N) status. However, there is currently no specific vegetation index for the NNI inversion across multiple growth periods.