Critical Nitrogen Curve and Remote Detection of Nitrogen Nutrition Index for Corn in the Northwestern Plain of Shandong Province, China
文献类型：SCI/SSCI论文
| 作者 | Zhang Q. |
| 发表日期 | 2013 |
| 关键词 | Critical nitrogen curve NNI remote sensing hyperspectral vegetation indexes zea-mays l. dilution curve winter-wheat chlorophyll content precision agriculture canopy reflectance sativa l. crop leaf |
| 英文摘要 | The nitrogen nutrition index (NNI) is calculated from the measured N concentration and the critical nitrogen (N) curve. It can be used to determine the N required by a crop and is helpful for optimizing N application in the field. Our objectives were to validate the existing corn critical N curve for the northwestern plain of Shandong Province and to design a more accurate remote detection method for the NNI. For this purpose, field measurements were conducted weekly to acquire the biomass and N concentrations during the corn growing season of 2011. Additionally, nearly 60 corn canopy spectra were collected during field campaigns. First, limiting and non-limiting N points were selected from sampled data, and they were used to validate the existing critical N curve. Second, an NNI estimation model based on a Principal Component Analysis method and Back Propagation Artificial Neural Network (PCA-BP-ANN) model was established. The collected canopy spectra and corresponding NNI were used to compare the performances of the above mentioned method and other for NNI estimation. The results showed that the N curve proposed in the literature is suitable for the study region. Among the three remote detection methods, PCA-BP-ANN provided the best results with highest R-2 value and lowest root mean square error value. |
| 出处 | Ieee Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| 卷 | 6 |
| 期 | 2 |
| 页 | 682-689 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1939-1404 |
| 源URL | [http://192.168.22.105/handle/311030/30626]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhang Q.. Critical Nitrogen Curve and Remote Detection of Nitrogen Nutrition Index for Corn in the Northwestern Plain of Shandong Province, China. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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