| Prediction on nitrogen, phosphorus, potassium contents in almond leaves based on Yarkent Models by hyper spectrum |
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| DOI：10.7606/j.issn.1000-7601.2017.02.25 |
| Key Words: Yarkent almond leaf nitrogen content phosphorus content potassium content spectral analysis correlation analysis regression analysis |
| Author Name | Affiliation | | ZHUANG Hong-mei | Institute of Horticultural Crops-Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China
Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Yecheng, Xinjiang 844900, China | | LU Chun-sheng | Institute of Horticultural Crops-Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China
Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Yecheng, Xinjiang 844900, China | | GONG Peng | Institute of Horticultural Crops-Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China
Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Yecheng, Xinjiang 844900, China | | XIE Hui | Institute of Horticultural Crops-Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China
Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Yecheng, Xinjiang 844900, China | | XU Ye-ting | Institute of Horticultural Crops-Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China
Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Yecheng, Xinjiang 844900, China | | FAN Ding-yu | Institute of Horticultural Crops-Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China
Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Yecheng, Xinjiang 844900, China | | ZHANG Wen | Institute of Horticultural Crops-Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China
Scientific Observing and Experimental Station of Pomology (Xinjiang), Ministry of Agriculture, Yecheng, Xinjiang 844900, China |
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| Abstract: |
| To establish a model to estimate foliar nitrogen, phosphorus and potassium contents in leaves, analysis in correlation between foliar nitrogen (N), phosphorus (P), and potassium (K) contents, providing effective, timely and nondestructive nutrition diagnosis for Yarkent almond. Based on effect by the experiment of using 3414 fertilizer, Unispec-SC spectrometer was employed to determine leaf spectral reflectance of Yarkent almond under different N, P and K fertilizer levels at fruiting, swelling, hardcoring and maturing stages in Shache. In addition, correlation analysis and regression analysis methods were carried out for statistical analysis. The results showed that the spectral sensitive bands of foliar N, P and K elements are different at fruiting, swelling, hardcoring and maturing stages. There is a certain relationship between leaf N, P and K contents and the spectral reflectance or its derivative variables. The R2 value of the fitting Cubics Ration and quadratic curve equation was high when the two spectral reflectances were used as independent variables, and the N, P, and K contents as the dependent variables. The best model for Yarkent almond leaf nitrogen nutrition diagnosis at the fruiting stage is Y=-2051.4471-7099.5965X-6048.4479X2, X=lgR823+lgR880; The best model for Yarkent almond leaf nitrogen nutrition diagnosis at the swelling stage is Y=(21.8812+39.8456X+24.3772X2+5.1255X3)/(0.005188X3), X=lgR382+lgR383；The best model for Yarkent almond leaf phosphorus nutrition diagnosis at the fruiting stage is Y=(-0.000003+0.000803X-0.070160X2+2.8169X3)/(0.407026X3), X=lg(R789+R790)；The best model for Yarkent almond leaf potassium nutrition diagnosis at the fruiting stage is Y=（-7.7960+22.5853X-21.8023X2+7.0133X3/0.000032X3, X=R830+R850. In conclusion, the spectral sensitive bands of N, P and K elements are different at these four phenological stages for Yarkent almond fruit development. The models for estimating foliar N, K and P content of Yarkent almond can be established according to the spectral sensitivity, spectral reflectance or its derivative variables. |
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