中文摘要：

以辐热积（每日温度相对热效应×光合有效辐射，Photothermal product，PTP）为光温指标，通过不同扦插期的试验研究了温度和辐射与‘千禧’一品红发育和品质指标的定量关系，明确了从短日至单苞期、单蕾期、多蕾期、开花期所需要的PTP。结果表明标准化株高净增量（株高净增量／扦插苗初始叶面积）与PTP呈幂函数关系；主干叶片净增数、侧枝叶片数、苞片数与PTP均呈线性关系；冠高比与PTP呈负指数关系。

英文摘要：

Using photothermal product （PTP） as the quantitative index, 4 different planting date experiments were conducted to investigate the quantitative effects of temperature and solar radiation on Euphorbia pulcherrima ‘Millenium＇ development and main external quality indices. The required PTP after short-day for development stages single-bract, single-bud, multi-bud and anthesis was determined. The relation between the ratio of net plant height increment to seedling leaf area （HLR） and PTP follows power function. The net increment of the number of leaves on main stem （ MLN）, the number of leaves per branch （BLN） and the number of bracts per branch （BN） are linearly related to PTP. The relation between the ratio of canopy diameter to plant height （PDH） and PTP follows negative exponent function. These results can be used as the guidelines for the optimization of temperature and radiation control for poinsettia production in greenhouse.