Abstract: Based on the data of the dates of picking off leaves and full flowering phase of peach-blossom and related meteorological conditions in Pear River Delta,this paper studied the effects of leafpicking off date and meteorological factors on peach-blossom’s full flowering in Spring Festival.The results showed that sectional simulation on the relationship between leafpicking off date and full flowering phase could obtain optimal fitting results,which presented linear equation of slope 0.7594 and approximately horizontal line,when the date of picking off leaves was before and after 12 December,respectively.The key meteorological factors affecting the initiatory time of full flowering were the average temperature during the mid-ten days of November to full flowering date,and the total sunlight hours of fifty days before full flowering phase.Their correlation coefficients with the days from picking off leaves to full flowering phase were -0.62 and -0.45,respectively (P<0.05).A forecasting model of suitable leaf-picking off date was established by multivariate linear regression method.The sample fitting verification of the model indicated that the errors of 79.2% samples were less than two days,and the result of test prediction in 2004 was also good.

Key words: Soybean, Faba bean, Root system, Configuration parameter, Spatial distribution