| Maize(Zea mays L.)is an important food crop in China.The planting area of corn in Northeast China is one of the main producing areas in China.The planting area of corn in Heilongjiang Province ranks first in China for many years.In the actual production process of maize,it is not enough to evaluate maize varieties only from the yield.After the realization of mechanized maize grain harvesting,maize varieties have higher requirements,so it is necessary to comprehensively evaluate maize varieties under multiple traits.In this experiment,18 maize hybrid varieties planted in 852 farm of Baoqing County,Heilongjiang Province were evaluated comprehensively by combining entropy weighting method and DTOPSIS method.Based on the phenotypic traits of different maize varieties,photosynthetic characteristics,yield,appropriate their traits and different analysis method for comprehensive evaluation of maize varieties,preliminary screening of high yield,strong adaptability,should receive,suitable for local planting new varieties of corn,popularized in large area of heilongjiang province has certain reference significance.The main research results are as follows:1.DTOPSIS method based on entropy weight assignment for comprehensive evaluation of maize varieties is a more scientific and reasonable method,included in the evaluation index of the test including production,hundred grain weight,spike length,spike,stem diameter,ear rows,row grains,protein content,starch content,fat content,stem fracture strength,ear height,the grain moisture content,bald tip length indicators,such as the test for the selected 18 is used to evaluate14 indicators of maize varieties,The order of C＿I value was Longken 17,Ningyu 665,Tianhe 2,Bona 308,Demeiya 3,Kendan 27,Hafeng 8,Lianchuang 102,Longping 781,Tianfeng 16,Zhaohe A79,Zhongdan 107,Longping 938,Ruifuer 1,Longdan 50,Kendan 15,Baoshou 606,Kendan 28.2.In suitable for mechanized harvesting,and through the different varieties of grain and grain moisture content receive related traits were analyzed,and found that the grain crushing rate and grain impurity rate and loss rate of the field and all present a very significant positive correlation between the grain moisture content,which shows that the grain moisture content is an important index of corn harvest mechanization,using the method of DTOPSIS assignment based on entropy weight of different varieties were analyzed,and the varieties with Longken 17,Ning Yu 665,Kendan 27,Bona 308 and Tianhe 1 performance compared with other varieties is more outstanding.3.In terms of SPAD value and photosynthetic characteristics,Longken 17,Ningyu 665,Tianhe 2,Bona 308,Hafeng 8 and Demeiya 3 performed better than other varieties.Longken 17,Ningyu 665,Tianfeng 16,Longping 781 and Tianhe 2 were higher than other maize varieties in lodging resistance.There were differences in ear length,ear diameter,ear row number and row number of grains among the 18 maize varieties,but the differences were small.There were great differences in yield and 100-grain weight among different varieties.4.Through to the 18 varieties of corn production,appropriate their characters and multiple evaluation indexes for comprehensive evaluation,comprehensive all aspects of factors were analyzed,and the results show that the dragon Ken 17,665,and 2 Ning Yu,boehner,Ken single 27308,five varieties of integrated performance is relatively good,recommend local with suitable cultivation techniques to promote planting and demonstration. |
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