Effects of Different Nitrogen Supply Level on Plant Growth and Development in Miniature Potted Rose
In order to study the effects of different nitrogen application levels on growth and development of miniatured potted rose,'Juicy Terrazza''Cinderella''Rosa Terrazza Pisce'and'Apollo Jewel'4 miniature potted roses varieties were as experimental materials,and 4 nitrogen application rates of 0(N1),70(N2),140(N3)and 210 mg·L-1(N4)were set.11 traits including measuring vegetative,reproductive growth,and chlorophyll fluorescence parameters were analyzed by the methods of principal component analysis and hierarchical cluster analysis.The critical nitrogen content in leaves at each growth and development stage was determined,and the critical nitrogen content dilution curve of miniatured potted rose was constructed.The results showed that the 11 traits varied in different degrees among different nitrogen application treatments.There were some correlations among traits,thus,a single trait could not objectively and comprehensively evaluate the effect of nitrogen application levels on the growth and development of miniature potted roses.Principal component analysis was used to the principal components,and the cumulative contribution rates of which in all cultivars were more than 93.500%.Hierarchical cluster analysis showed that the 4 nitrogen treatments of'Juicy Terrazza'were divided into 2 groups,and the other varieties were divided into 3 groups.Based on the comprehensive evaluation score of principal component analysis and cluster analysis results,considering the principle of reducing fertilizer and increasing benefits,the optimal nitrogen content in'Juicy Terrazza''Cinderella'and'Rosa Terrazza Pisce'was 140 mg·L-1 each time,but that in'Apollo Jewel'was 210 mg·L-1.According to the comprehensive analysis,the N1 and N2 treatments were divided into nitrogen-limited treatment,and the N3 and N4 treatments were divided into non-nitrogen-limited treatment,and based on leaf area index the leaf nitrogen content dilution curves were constructed.Above results provided a reference for precision nitrogen application.
万方数据
维普
