Determination of a Multivariate Indicator of Nitrogen Imbalance (MINI) in potato using reflectance and fluorescence spectroscopy

被引:11
作者
Bélanger, MC
Viau, AA
Samson, G
Chamberland, M
机构
[1] Univ Laval, Lab Geomat Agr & Agr Precis, Ste Foy, PQ G1K 7P4, Canada
[2] Univ Quebec Trois Rivieres, Trois Rivieres, PQ G9A 5H7, Canada
[3] Telops, Quebec City, PQ G2E 6J5, Canada
关键词
D O I
10.2134/agronj2005.0040
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
In this study, we evaluated the potential of reflectance and fluorescence for the detection of the Compositional Nutrient Diagnosis (CND) N index (IN). The CND reflects nutrient deficiencies as well as nutrient interactions, contrary to conventional methods of nutrient stress detection. Potato plants (Solanum tuberosum L. cv. Superior) were grown in a greenhouse, and three different nutrient deficiencies (K, Mg, and N) were induced at three levels and compared with a control receiving a complete nutrient solution. Nitrogen deficiency induced a significant biomass reduction compared with control plants whereas no significant effect was observed for K or Mg treatments. Foliar analyses were realized to compute the CND_r(2) using the CND. The ANOVA conducted on CND_r(2) and I-N showed significant differences only between N-deficient and control plants. Using a canonical discriminant analysis over reflectance and fluorescence indices, it was possible to correctly classify 96.6% of potato plants in its corresponding IN class. A new Multivariate Indicator of Nitrogen Imbalance (MINI) was developed using the canonical variable computed from reflectance and fluorescence indices. The MINI can detect almost 70% of the N-deficient plants and more than 90% of the N-sufficient plants. This indicator allows a rapid data acquisition and handling and provides deficiency detection within the time-window for plant response to recovery fertilization.
引用
收藏
页码:1515 / 1523
页数:9
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