| The change and difference of meteorological factors in different sowing period under the condition of research,analysis of the influence of meteorological factors on growth and development of rapeseed varieties,summarized the relationship between different maturity varieties and growth temperature and light conditions,has important significance for the realization of rape cultivation,scientific and reasonable regulation of Agronomic measures.This study conducted a field planting and growth period were compared to the 144 cultivars mainly from the Yangtze River Basin,choose different maturity representative varieties(lines)12 analysis test and meteorological factors in different sowing,the main results are as follows.1.According to the synthetic score of the common factor model,the light and temperature characteristics of 144 rape varieties were evaluated,which were divided into two categories: light and temperature sensitive and light temperature insensitive.It was found that the branches of light sensitive rape cultivars were significantly higher than those of light sensitive and insensitive varieties.2.Delaying sowing date will shorten the growth period of rapeseed,the whole growth period days of 12 cultivars in 5 swoing dates from September 20 th to October 28 th ranged from 201-228 days,195-211 days,190-211 days,186-203 days and 183-203 days,and the whole growth period days of all varieties was shortened with the postponement of sowing date.The maximum difference of the growth period between 5 sowing dates was 24,21,17 and 13 days respectively,indicating that the difference of whole growth period days of each species decreased with the postponement of sowing date.3.The accumulative temperature has different effects on the different growth stages of rapeseed at different maturity.Three years of test in 2014-2017,all varieties required at least 1875.46℃d of accumulative temperature(≥0 ℃),seedling stage,seedling,budding,flowering and pod stage need at least 96.29 ℃d,609.84 ℃d,88.76 ℃d,170.44℃d and 471.87℃d.The accumulated temperature decreased with the delay of sowing date of different varieties during whole growth period,5 sowing dates in 2014-2015 year test of all varieties at seedling stage,bud stage,flowering and pod stage need at 609.84-1542.89℃d,88.93-364.04℃d,243.28-820.42℃d and 448.82-744.81℃d.4.The average temperature affect each growth stages when rapeseed growth,and the number of days from sowing to seeding increased with the decrease of average temperature,the trend of different maturity varieties was consistent.Seedling days showed a different trend for different maturity with the average temperature,the days of seedlings of early maturing varieties increased with the decrease of average temperature when the late maturing varieties showed decreasing trend with the average temperature.The days of the bud period reduce with the increase of average temperature except QingZa 7.The days of the flowing stage reduce with the increase of average temperature except ZhongShuang11.The days of silique mature all varieties of during pod stage decreased with the increase of temperature.5.Between the 5 sowing dates from September 20 th to October 30 th,the yield decreased by 5.42%,10.67%,17.86% and 24.46% for each sowing date,respectively,compared with the first sowing date.But Qingza 7 is different,because the early planting of early bolting flowering significantly,sowing yield will rise.6.Meteorological factors have different effects on yield of different maturity varieties,for early maturing rapeseed varieties,it has a direct positive effect on its yield,and the cumulative sunshine hour is the most influential factor,While the yield of middle maturing variety is directly positive by the accumulated temperature,while late maturing variety is radiation.The most influential factor of meteorological to early,middle and late maturing varieties are rainfall,high temperature and radiation,days of higher then 25℃。... |
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