Selection Of Spring Maize Varieties With High-yield, Density-tolerance And Suitable For Machine Harvesting In Eastern Of Hebei Province

In this study,18 spring maize varieties tested were evaluated for high-yield,density-tolerance and suitable for machine harvesting by Grey Relational Analysis(GRA),and the Analytic Hierarchy Process(AHP)and Grey Relational Analysis were used to comprehensive evaluated and variety selection of high-yield,density-tolerance and suitable for machine harvesting for the 18 spring maize varieties.In order to screen out high-yield,density-tolerance and suitable harvesting spring maize varieties suitable for planting in Eastern of Hebei province.The results are as follows:1.Taking the comprehensive evaluation value of high-yield,density-tolerance and suitable for machine harvesting of spring maize varieties as the general objective,a criterion layer consisting of three secondary indexes of high-yield,density-tolerance and suitable for machine harvesting was established under the target layer,and an index layer was established under each criterion layer to form the index layer,thus a comprehensive evaluation index system of high-yield,density-tolerance and suitable for machine harvesting of spring maize was constructed.2.When evaluating spring maize varieties for high-yield,density-tolerance and suitable for machine harvesting by Grey Relational Analysis method,the first one is preliminary screening of the evaluated varieties.The evaluated varieties for high-yield,density-tolerance and suitable for machine harvesting evaluation are 18,11 and 8,respectively;Then,Grey Relational Analysis was carried out for the preliminary selected varieties,and the weight of each index was combined with the normalized value,so as to obtain the expected values of the high-yield,density-tolerance and suitable for machine harvesting of each evaluated variety,and the optimal varieties for each evaluation were selected according to the size of the expected values,which were Zhengdan 958,Dongdan 913 and jingnongke728,respectively.3.In the comprehensive evaluation of high-yield,density-tolerance and suitable for machine harvesting of spring maize varieties by using Analytic Hierarchy Process and Grey Relational Analysis,the preliminary screening of the evaluated varieties is still needed at first,and the requirements of each evaluation index must be met,so a total of eight evaluated varieties are screened out;Then,the weight of each index at the criterion level relative to the target level is determined by using the Analytic Hierarchy Process,and theweight of each index at the index level relative to the criterion level is determined by using the Grey Relational Analysis method,and then the hierarchical weight and the correlation weight are combined to form a comprehensive weight;Then according to the calculation formula of the comprehensive evaluation expectation value,the comprehensive evaluation expectation value of each spring maize variety evaluated can be obtained.The results showed that the spring maize cultivar with the highest comprehensive evaluation expectation was jingnongke 728,followed by C6361.The spring maize varieties Jingnongke 728,C6361 et al with high comprehensive evaluation value of high-yield,density-tolerance and suitable for machine harvesting selected by this evaluation method also have good comprehensive performance in local production practice.Which indicates that the comprehensive evaluation index system,evaluation analysis methods and evaluation results of high-yield,density-tolerance and suitable for machine harvesting of spring maize varieties established in this study have good production applicability,so this method can be used for screening high-yield,density-tolerance and suitable for machine harvesting of spring maize varieties in Eastern of Hebei province.