Monitoring Nitrogen Nutrition and Grain Protein Content of Rice Based on Ensemble Learning

Jie ZHANG; Bo XU; Hai-kuan FENG; Xia JING; Jiao-jiao WANG; Shi-kang MING; You-qiang FU; Xiao-yu SONG

doi:10.3964/j.issn.1000-0593(2022)06-1956-09

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 6 >Page 1956 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 6, 1956 (2022)

Monitoring Nitrogen Nutrition and Grain Protein Content of Rice Based on Ensemble Learning

Jie ZHANG^{1、1; 2;}, Bo XU^1、1;, Hai-kuan FENG^1、1;, Xia JING^2、2;, Jiao-jiao WANG^1、1;, Shi-kang MING^1、1;, You-qiang FU^3、3;, and Xiao-yu SONG^{1、1; *;}

Author Affiliations

¹1. Information Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100094, China

²2. School of Surveying and Mapping Science and Technology, Xi'an University of Science and Technology, Xi'an 710054, China

³3. Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China

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DOI: 10.3964/j.issn.1000-0593(2022)06-1956-09 Cite this Article

Jie ZHANG, Bo XU, Hai-kuan FENG, Xia JING, Jiao-jiao WANG, Shi-kang MING, You-qiang FU, Xiao-yu SONG. Monitoring Nitrogen Nutrition and Grain Protein Content of Rice Based on Ensemble Learning[J]. Spectroscopy and Spectral Analysis, 2022, 42(6): 1956 Copy Citation Text

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Fig. 1. Correlation between canopy spectrum and nitrogen parameters at different growth stages of rice in 2019 and 2020

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R2, RMSE and MAE based on the canopy spectral data seed protein content model of rice at different fertility stages

Fig. 2. R², RMSE and MAE based on the canopy spectral data seed protein content model of rice at different fertility stages

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Fig. 3. R², RMSE and MAE of seven algorithms under different parameter combinations at Panicle Initiation and Heading stage

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Fig. 4. R², RMSE and MAE of seven algorithms with full band spectral information and PNA as input in Panicle Initiation stage

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Fig. 5. R², RMSE and MAE of seven algorithms with full band spectral information and PNC as input at Heading stage

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参数	2019年		2020年
参数	分化期	抽穗期	分化期	抽穗期
冠层光谱	√	√	√	√
长势参数(LNC, LNA, PNC, PNA)	√	√	√	√
水稻品质数据	√	√	√	√

Table 1. Test data acquisition

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方法	LNC/%			LNA/(g·m^-2)			PNC/%			PNA/(g·m^-2)
方法	R²	RMSE	MAE	R²	RMSE	MAE	R²	RMSE	MAE	R²	RMSE	MAE
PLSR	0.283	0.284	0.198	0.581	0.648	0.477	0.319	0.197	0.131	0.608	0.913	0.595
KNN	0.527	0.232	0.155	0.609	0.627	0.411	0.490	0.174	0.097	0.613	0.911	0.562
BRR	0.418	0.258	0.097	0.678	0.569	0.217	0.571	0.158	0.071	0.767	0.706	0.323
SVR	0.606	0.213	0.096	0.697	0.556	0.259	0.712	0.130	0.070	0.772	0.708	0.352
RF	0.912	0.120	0.110	0.944	0.272	0.230	0.930	0.084	0.079	0.938	0.399	0.353
Adaboost	0.927	0.110	0.187	0.932	0.304	0.504	0.920	0.082	0.144	0.935	0.402	0.734
Bagging	0.807	0.154	0.219	0.915	0.311	0.532	0.861	0.103	0.153	0.914	0.465	0.723

Table 2. Model accuracy of nitrogen parameters based on canopy spectral data of rice at Panicle Initiation stage

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方法	LNC/%			LNA/(g·m^-2)			PNC/%			PNA/(g·m^-2)
方法	R²	RMSE	MAE	R²	RMSE	MAE	R²	RMSE	MAE	R²	RMSE	MAE
PLSR	0.699	0.202	0.156	0.645	1.081	0.834	0.705	0.110	0.080	0.619	2.256	1.727
KNN	0.630	0.199	0.141	0.677	1.084	0.740	0.679	0.098	0.083	0.612	2.354	1.696
BRR	0.738	0.112	0.084	0.658	0.504	0.385	0.779	0.061	0.049	0.652	1.221	0.943
SVR	0.749	0.104	0.089	0.682	0.506	0.410	0.827	0.063	0.055	0.626	1.216	1.071
RF	0.944	0.137	0.103	0.948	0.591	0.436	0.951	0.073	0.057	0.920	1.346	1.042
Adaboost	0.954	0.241	0.185	0.937	1.057	0.826	0.938	0.133	0.109	0.909	2.387	1.918
Bagging	0.894	0.216	0.159	0.905	1.100	0.833	0.911	0.127	0.093	0.888	2.358	1.792

Table 3. Model accuracy of nitrogen parameters based on canopy spectral data of rice heading stage

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方法	LNC/%			LNA/(g·m^-2)			PNC/%			PNA/(g·m^-2)
方法	R²	RMSE	MAE	R²	RMSE	MAE	R²	RMSE	MAE	R²	RMSE	MAE
PLSR	0.379	0.309	0.236	0.580	1.028	0.760	0.438	0.267	0.212	0.592	2.553	1.953
KNN	0.375	0.313	0.245	0.639	0.962	0.704	0.332	0.293	0.231	0.584	2.585	1.921
BRR	0.596	0.250	0.198	0.731	0.824	0.622	0.833	0.146	0.116	0.837	1.616	1.202
SVR	0.601	0.250	0.190	0.711	0.868	0.596	0.736	0.186	0.149	0.781	1.900	1.304
RF	0.922	0.135	0.107	0.943	0.440	0.325	0.925	0.115	0.091	0.952	0.978	0.716
Adaboost	0.778	0.199	0.181	0.876	0.596	0.509	0.848	0.154	0.133	0.919	1.426	1.213
Bagging	0.896	0.139	0.105	0.905	0.531	0.376	0.896	0.123	0.094	0.935	1.073	0.789

Table 4. Model accuracy of nitrogen parameters based on canopy spectral data of rice whole growth period

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