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氮素是影响花卉生长与外观品质的重要营养元素。定量研究氮素对温室切花百合外观品质的影响,可为切花百合氮素管理提供决策支持。以百合‘索邦’和‘西伯利亚’为材料,根据不同定植期、生长中后期不同速效氮素水平处理试验,以冠层累积吸收辐热积(PTI)为发育尺度,以现蕾期叶片累积氮含量为植株氮素特征指标,定量分析氮素对切花百合外观品质指标(叶面积指数、株高、出叶数、第1花蕾长度与第1花蕾直径)和出花率的动态影响。在此基础上,建立氮素对切花百合外观品质影响的模拟模型,并用独立的试验数据对模型进行检验。结果表明,模型对叶面积指数、株高、出叶数、第1花蕾长度、第1花蕾直径、一级花、二级花、三级花和四级花的预测效果较好,预测值与实测值之间基于1∶1线的决定系数(r2)分别为0.92、0.85、0.86、0.91、0.88、0.88、0.88、0.91和0.91,相对回归估计标准误(rRMSE)分别为0.09、0.10、0.14、0.13、0.12、0.18、0.15、0.18和0.21。研究建立的模型为长江中下游地区温室切花百合生产中氮素的优化管理提供了模型工具,也为露地栽培切花百合生产中氮素的优化管理提供了参考。
Nitrogen is an important nutrient that affects the growth and appearance quality of flowers. Quantitatively studying the effect of nitrogen on the appearance quality of cut flower lily in greenhouse can provide decision support for the nitrogen management of cut lily. Taking lily ’Sorbonne’ and ’Siberia’ as materials, according to the treatment of different available nitrogen levels in different planting stages and middle and late growth stages, the cumulative canopy heat accumulation (PTI) Nitrogen content is the characteristic index of plant nitrogen, and the dynamic influence of nitrogen on the appearance quality indexes (leaf area index, plant height, number of leaves, the length of the first flower bud and the diameter of the first flower bud) and the flowering rate of the cut lily is quantitatively analyzed. On this basis, a simulation model of the effect of nitrogen on the appearance quality of cut lily flowers was established, and the model was tested with independent test data. The results showed that the model had good predictive value for leaf area index, plant height, leaf number, length of first flower bud, diameter of first flower bud, first flower, second flower, third flower and fourth flower. The determination coefficients (r2) based on the 1: 1 line between the measured values were 0.92,0.85,0.86,0.91,0.88,0.88,0.88,0.91 and 0.91, respectively, and the relative standard error of regression (rRMSE) were 0.09,0.10,0.14 0.13, 0.12, 0.18, 0.15, 0.18 and 0.21. The model established by the study provided a model tool for the optimized management of nitrogen in the greenhouse cut flower lily production in the middle and lower reaches of the Yangtze River, and also provided a reference for the optimal management of nitrogen in the cultivation of cut flower Lily.