ACTA HORTICULTURAE SINICA ›› 2006, Vol. 33 ›› Issue (1): 168-171.

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(¹College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China; ²College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China; ³ Key Lab of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201106, China; ⁴Nanjing Institute of Vegetable and Flower Sciences, Nanjing 210042, China)

Received:2005-02-03 Revised:2005-05-09 Online:2006-02-25 Published:2006-02-25

Abstract

Abstract: 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 pulcherrim a '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 top lant height ( PDH) and PTP follows negative exponent function. These results can be used as the guidelines for the op timization of temperature and radiation control for poinsettia production in greenhouse.

Key words: Euphorbia pulcherrima, Temperature, Photosynthetically active radiation, Photothermal product, Development, Quality

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