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1、2013 1255 dominant major rapeseed。producing region in Sichuan Province，with wide area and high per unit area yieldThe main cropping pattern is rice。rape。 seed(wheat)rice field-upland field ro tation31and there are relatively promi nent seasonaI contradictionsIn order to alleviate the problems of cro
2、pping coordinationseedling transplanting is mainly adopted as the traditionaI rapeseed cultivation methodHowev- erdue to the shortage of Iabor re- sources and increasing planting costs in recent years，rapeseed cultivation efficiency js relatively IowNo-tillage directsowing cultivation technology of
3、rapeseed has several advantages such as Iow costhigh efficiency and suitable for mechanicaI operations which has been gradually promoted and applied in China4-6A Iarge num- ber of studies have been increasingly carried out on varieties，growth char- acteristics and cultivation techniques of direct-so
4、wing rapeseed in the mid- die and Iower reaches of Yangtze Riv- er7-1 01which have played an impor tant role in guiding rapeseed cultiva- tion in this region11-14Compared with the middle and lower reaches of Yangtze River，Western Sichuan Plain has warm and humid climatesmooth- ly changing temperatur
5、e and short frosty period in winterresulting in shorter whole growth period of rape- seed than other regions in the same latitude151The unique ciimatic condi tions determine the specific growth rules of rapeseedEspecially，the con tinuous precipitation and severe field waterlogging in rapeseed planti
6、ng seasons in middle and Iate September seriously affect the sowing，seed gen- eration and seedling growth of rape- seedThereforeit is urgent lo change the seedling transplanting pattern into late direct-sowing avoidingdisaster cultivation pattern【1 61Howeverrela tively few researches have been con-
7、ducted on varieties and growth char- acteristics of no-tillage late direct-SOW- ing rapeseed in Western Sichuan Plain In this study，ten high-quailty vari eties of Brassica napus Lwere intro- duced fr0m different major breeding u nits in the Yangtze River Basin for comparative experiment，which pro vi
8、ded scientific basis for screening high-yield and high-quality varieties of Brassica napus Lwhich are suitable for cultivation in ecologicaI zones in Western Sichuan Plain and adapt to notillage Iate direct-sowing simplified cultivation measuresjmproving plant- ing benefits of farmersand introduc- t
9、ion，screening and utilization of new varieties of rapeseed in Sichuan Province Materials and Methods Experimental varieties and sources Ten varieties of Brassica napus L were introduced from different major breeding units in the Yangtze River Basin as experimental materials (Table 1)，withChuanyou 58
10、as the contro1 Experimental plot The experimental plot is Iocated in Guanghan Experimental Base of Sichuan Academy of AgriculturaI Sci ences，with soil type 0f cIay loam，up per fertility，previous crop of rice，and convenient irrigation and drainage systems Methods The comparative experiment was conduc
11、ted by randomized block de- sign，with three replicationsThe area of experimental plot was 2O m f5 m long，4 m wide)The planting density was 1 5O 000 plantshm,surrounded by protective JinesDifferent varieties of Brassica napus Lwere planted by notillage direct-sowing and straw mulching on October 1 22
12、008In ad- dition6 000-7 500 m m 10 glyphosate was selected as destuctive herbicide and mixed with 600-750 kghm water for spraying 5 d before sowingDuring the whole growth peri- od，the fertilizer application amount Table 1 Experimental varieties and sources was 1 5O kghm pure N fbasaItop- dressing ra
13、tio was 6：4)，1 20 kghm P205 and 126 kghm K20；to be spe- cific，1 96 kghm urea，1 000 kghm。 superphOsphate，21 0 kghm potassi- um chloride and 1 5 kghm boron fer- tilizer were applied as basaI fertilizer Ten plants of each variety were randomly selected to measure related indicators in green pod period；
14、after the maturityreaI yield in the experi- mentaI plot was measuredExperi mental data were analyd using DPS 655 software切 Results and Analysis Yield The yields of ten experimentaI varieties of Brassica napus Lwith Iow erucidic acid and glucosinolate content were analyzedAs can be seen from Table 2t
15、he yields of ten experimentaI varieties of Brassica napus Lranged from 2 235,17 to 3 12717 kghm2with an average of 2 72060 kghm ：the yield ofHuayouza 10was 3 12717 kghm2。which ranked the first among ten experimental rapeseed varieties and was improved by 3967 kghm compared with the controIChuanyou 5
16、8，with an increase rate of 1_28， but the difference was not significant； the yield of Chuanyou 58was 3 0875O kghm2。ranking the second among ten experimental varieties of Brassica napus L：the yields of other experimental varieties of Brassica na pus Lwere alI reduced compared with the control，to be specific，the yields of Ningza 1 1 Huayouza 13and Zheshuang 3were not significa
