Spatial distribution of SPAD value and determination of the suitable leaf for N diagnosis in cucumber

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Hu, Jing^1,2 ; Li, Chenxiao^1 ; Wen, Yifang^1 ; Gao, Xinhao^1 ; Shi, Feifei^1 ; Han, Luhua^2

Suzhou Vocational Institute of Industrial Technology, Suzhou

215104, China^1

Key Laboratory of Modern Agriculture Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang

212013, China^2

关键词: Best position;    Coefficient of variation;    Greenhouse experiments;    Leaf area;    Leaf nitrogen content;    Leaf position;    Nitrogen concentrations;    Nitrogen levels;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/2/022001/pdf
DOI  :  10.1088/1755-1315/108/2/022001

来源: IOP

【 摘 要 】

To determine the best leaf position for nitrogen diagnosis in cucumber with SPAD meter, greenhouse experiments were carried out to study spatial distribution of SPAD value of different position of the 3rd fully expanded cucumber leaf in the effect of different nitrogen levels, and the correlations between SPAD values and nitrogen concentration of chlorophyll. The results show that there is remarkable different SPAD value in different positions of the 3rd fully expanded leaf in the flowering and fruiting stage. Comparing the coefficients of SPAD value variation, we find that the coefficient of variation of leaf edge was significantly higher than the edge of the main vein, and the coefficient of variation of triangular area of leaf tip is significantly higher than any other leaf area. There is a significant correlation between SPAD values and leaf nitrogen content. Preliminary study shows that triangular area of leaf tip from the 20% leaf tip to leaf edge is the best position for nitrogen diagnosis.