Crops ›› 2018, Vol. 34 ›› Issue (5): 116-120.doi: 10.16035/j.issn.1001-7283.2018.05.018

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Hyperspectral Estimation of Nitrogen Content in Rice Panicle

Chen Yingying,Wangxu Yiling,Zhu Yuhan,Wu Wei,Liu Tao,Sun Chengming   

  1. College of Agronomy, Yangzhou University/Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Collaborative Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, Jiangsu, China
  • Received:2018-04-03 Revised:2018-07-18 Online:2018-10-15 Published:2018-10-12
  • Contact: Chengming Sun

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Abstract:

Nitrogen is one of the main nutrient elements affecting the growth and development of rice. The growth of rice panicle is closely related to nitrogen nutrition. In this study, the nitrogen content in rice panicle was measured and analyzed by using hyperspectral technology, and the results showed that total nitrogen content of rice panicle and canopy spectral reflectance presented highly significant negative correlation in the near infrared band 760nm to 1 300nm. The correlations between total nitrogen content of rice panicle and spectral characteristic parameters, such as λb, SDr, SDr/SDb and DVI were good, and the estimation models were established based on these relationships. The tested result by independent measured data showed that the quadratic function model y=2.075+0.001x1-2.952x2 based on SDr/SDb and DVI was the best model for estimating total nitrogen content of rice panicle. The above results could provide a new method to diagnose nutrient elements in rice panicle rapidly.

Key words: Rice, Rice panicle, Hyperspectral, Nitrogen content, Estimation model

Fig.1

The spectral curves of different rice varieties in ear/flowering stage"

Fig.2

The correlation between total nitrogen content of rice panicle and canopy spectral reflectance"

Table 1

The correlation between total nitrogen content of rice panicle and spectral characteristic parameters"

光谱指数Spectral index 描述Description 相关系数Correlation coefficient
Db 蓝边覆盖490~530nm内一阶微分光谱最大值 -0.384
λb Db对应波长位置 -0.449*
Dr 红边覆盖680~780nm内一阶微分光谱最大值 -0.282
Rg 波长510~560nm最大波段反射率（即绿峰反射率） -0.262
SDb 蓝边范围内一阶微分波段值的总和 -0.117
SDr 红边范围内一阶微分波段值的总和 -0.430*
SDr/SDb 红边范围内一阶微分波段值的总和/蓝边范围内一阶微分波段值的总和 -0.558**
RVI 比值植被指数 -0.172
NDVI 归一化植被指数 -0.121
DVI 差值植被指数 -0.516*
SAVI 土壤调节植被指数 -0.364

Table 2

The estimation model of total nitrogen content of rice panicle"

光谱指数
Spectral index		 拟合方程
Fitted equation		 R2
SDr/SDb y=0.981+0.001x 0.311**
DVI y=-1.597-34.688x2+20.486x 0.429**
y=3.648e-3.282x 0.324**
λb y=-75.627+0.148x 0.201*
SDr y=2.156-3.023x 0.185*
y=2.915e-2.945x 0.232*
SDr/SDb, DVI y=2.075+0.001x1-2.952x2 0.505**

Fig.3

The test result of multiple linear regression model"

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