QUANTIFYING THE EFFECTS OF NITROGEN ON DRY MATTER PARTITIONING OF STANDARD CUT CHRYSANTHEMUM ‘SHENMA’ IN SOLAR GREENHOUSE

doi:10.3773/j.issn.1005-264x.2009.01.012

Abstract

Abstract:

Aims Dry matter partitioning is the basis of external quality formation of ornamental plants. Nitrogen is the important nutrient affecting dry matter partitioning of plants. Our aim was to quantitatively investigate the effects of nitrogen on dry matter partitioning of standard cut chrysanthemum (Dendranthema morifolium ‘Shenma’) grown in a solar greenhouse.
Methods We conducted our experiments using different planting dates and different levels of nitrogen application rates in a solar greenhouse in Beijing, China during October 2005 and July 2006. The integrated photo-thermal index, the product of thermal effectiveness, photosynthetically active radiation (PAR) and day length (PTEP), was used to describe changes of the partitioning indices of leaf, stem and flower with development stages. Effects of the accumulated leaf nitrogen content at bud-showing stage on the dynamics of the partitioning indices of leaf, stem and flower were quantified based on experimental data. Based on these quantitative relationships, we developed a model for predicting the effects of nitrogen on dry matter partitioning. Independent experimental data were used to validate the model.
Important findings The seasonal maximum accumulated leaf nitrogen content occurred at the bud- showing stage, and the optimal value at this stage is 1.62 g·m^-2. Based on the 1:1 line, the coefficients of determination (R²) between the simulated and measured dry weight of stem, leaf and flower were 0.96, 0.97 and 0.94, respectively, and the relative prediction errors (RSE) between the simulated and measured dry weight of stem, leaf and flower were 8.26%, 5.76% and 3.70%, respectively. The model we developed can satisfactorily predict dry weight of stem, leaf and flower using greenhouse air temperature, radiation, day length and the accumulated leaf nitrogen content at the bud-showing stage as inputs; hence, it can be used for the optimization of nitrogen management for standard cut chrysanthemum ‘Shenma’ production in solar greenhouse.

Key words: standard cut chrysanthemum, solar greenhouse, leaf nitrogen content, dry matter partitioning, model

MI Xiao-Jie, DAI Jian-Feng, LUO Wei-Hong, DING Qi-Feng, CHEN Yong-Shan, ZHAO Chun-Jiang, QIAO Xiao-Jun, LIU Ke-Xin. QUANTIFYING THE EFFECTS OF NITROGEN ON DRY MATTER PARTITIONING OF STANDARD CUT CHRYSANTHEMUM ‘SHENMA’ IN SOLAR GREENHOUSE[J]. Chin J Plant Ecol, 2009, 33(1): 108-117.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.01.012

https://www.plant-ecology.com/EN/Y2009/V33/I1/108

Figures/Tables 7

Table 1 Nutrient content of the experimental soil

项目 Item	全氮 Total N (%)	有机质 Organic C (%)	速效氮 Available N (mg·kg^-1)	速效磷 Available P (mg·kg^-1)	速效钾 Available K (mg·kg^-1)	容重 Bulk density (g·cm^-3)	pH	EC (mS·cm^-1)
试验一Exp1	0.13	2.69	25.53	202.1	138	1.12	7.74	0.11
试验二Exp2	0.14	2.47	33.33	232.7	155.8	1.12	7.83	0.25

Table 2 Nitrogen available in the soil during the experimental season

处理 Treatments	1	2	3	4
试验一 Exp1
施氮量N applied in the experimental season (kg N·hm^-2)	0	34	69	103
定植时土壤速效氮量N content of the soil at planting date (kg N·hm^-2)	57.2	57.2	57.2	57.2
当季土壤供氮量N available in the soil during the experimental season (kg N·hm^-2)	57.2	91.2	126.2	160.2
试验二 Exp2
施氮量N applied in the experimental season (kg N·hm^-2)	0	24	48	72
定植时土壤速效氮量N content of the soil at planting date (kg N·hm^-2)	79.1	79.1	79.1	79.1
当季土壤供氮量N available in the soil during the experimental season (kg N·hm^-2)	79.1	103.1	127.1	151.1

Fig. 1 Diagram of the locations where global radiation and air temperature were measured in the experimental solar greenhouse

Fig. 2 Relationship between the partitioning indices of shoot and different organs of shoot of standard cut chrysanthemum ‘Shenma’ and the physiological product of thermal effectiveness and PAR (PTEP) after planting under different levels of nitrogen application rates

Fig. 3 Relationship between the accumulated leaf nitrogen content of standard cut chrysanthemum ‘Shenma’ and the physiological product of thermal effectiveness and PAR (PTEP) after planting under different planting and levels of nitrogen application rates (A) and relationship between the accumulated leaf nitrogen content at bud showing stage of standard cut chrysanthemum ‘Shenma’ and the nitrogen available in the soil during the experimental season (B)

Fig. 4 Relationship between the accumulated leaf nitrogen content at bud showing stage and the increasing, decreasing rate of different partitioning indices and the maximum, the minimum value of the partitioning indices of standard cut chrysanthemum ‘Shenma’

Fig. 5 Comparison between the predicted and the observed dry weight of different organs, levels of nitrogen application rates of standard cut chrysanthemum ‘Shenma’

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