Effects Of Temperature And Light On Quality Of Autumn Standard Cut Chrysanthemum Morifolium Cv Shenma

Chrysanthemum is one of the top four cut flowers in the word and temperature andlight are the main environmental factors affecting its quality. In this study, using 'shenma'as material, experiments with different transplanting date and density, were conducted inGLP-type multi-span greenhouse from July of 2004 to June of 2005 in Shanghai area.Effects of different temperature and light on quality were analysised. The suitableplanting date was then determined in Shanghai area. Based on the concept ofphotothermal product (PTP), the quantifive relationships between quality of cutchrysanthemum and PTP was developed. Aiming at different quality, the suitable plantingdensity was given corresponding different planting date.(1) Quantitive analysis between quality of standard cut chrysanthemum 'Shenma'and temperature and light in different planting date. The aim of the study was todetermine the optimum planting date and according to this planting date, the best suitablelight and temperature conditions were decided for standard cut chrysanthemum(Chrysanthemum mofifolium, ev. Shenma) in Shanghai area. The results showed that, inproduction of standard cut chrysanthemum in non-heated greenhouse of Shanghai area,when the production aim was rank A, the suitable planting date was the middle ten daysof August, at which accumulated photothermal product was 273.3MJ·m^-2-250MJ·m^-2,maximum day temperature was 33.5-16℃, accumulated DIF was 361.2℃. Usingphotothermal product (PTP) as the qualities index, the results showed that net plantdiameter(NPD) and the number of net leaves(NLI) are linearly related to PTP (NPD=0.013PTP-0.117, R²=0.948, SE=0.239mm; NLI=0.224PTP-1.595,R²=0.956, SE=3.785pieces·plant^-1). The relationship between the net plant height increment(NPH) and PTP,relative net leaf length increment(RNL) and PTP both followed negative exponentialfunction (NPH=5.7567EXP(0.0192-0.00031PTP²), R²=0.976, SE=5.273cm;RNL=1.00038-1.66273EXP(-PTP/26.1974), R²=0.931, SE=0.929).(2) Effects of density on the quality and LAI of standard cut chrysanthemum.The aim of the study was to analyse effects of denstiy on cut chrysanthemum quality, leafarea per plant, leaf area index. The results showed that, within the experimental range of planting density, the flower neck length increased with the increase of planting densitywhereas leaf number per plant, stem diameter, plant fresh weight and flower diameterdecreased with the increase of planting density. Plant height was not affected by plantingdensity. For cut chrysanthemum production in non-heated greenhouse in Shanghai, toachieve the top rank of quality (rank A), the optimal planting density was 64 plant·m^-2; toachieve the second rank of quality (rank B), the optimal planting density was 72-80plant·m^-2. Leaf area per plant decreased with the increase of planting density, LAIincreased with the increase of planting density. The optimal LAI was 12.9-13.3 in thesecond planting date. The results obtained in this study can be used to guide themanagement of planting density of standard cut chrysanthemum production ingreenhouse in Shanghai.