黄河三角洲盐碱地不同青贮玉米品种的适宜性评价OA北大核心CSTPCD

To select suitable silage maize varieties in the saline-alkali land of Yellow River Delta,the yield,agronomic traits and nutrition contents of 10 maize varieties for both grain and forage/special silage were analyzed,and a comprehensive evaluation was conducted by the principal component analysis.The results showed that:1)There were no significant differences in fresh yield of the 10 maize varieties,but there were significant differences in dry yield(10.2-20.1 t/hm2),and'Laiyu 721'was the highest,following with'Dajingjiu 4059''Denghai 605''Lilong 915''Denghai 652''Zhengdan 958''Ludan 211''Zhonghang 611''Yuqingzhu 23'and'Ludan 256';and ear yield(3.7-12.2 t/hm2)showed a similar parttern.2)There were significant differences in agronomic traits among the varieties,and the plant height of'Dajingjiu 4059'(246.4 cm)was highest,and that of'Denghai 605'(185.6 cm)was the lowest.The leaf greenness of'Yuqingzhu 23'(97.2％)was the highest,and that of'Zhonghang 611'(87.1％)was the lowest.The leaf length and width of'Zhengdan 958'(69.1 cm,9 cm)were the highest,and those of'Ludan 211'(49.8cm,5.3 cm)were the lowest.3)There were significant differences in nutrition contents among all varieties,and the starch content ranged from 25 to 36 g/100 g,the crude protein content ranged from of 7.01 to 8.95 g/100 g,the neutral detergent fiber(NDF)content ranged from 32 to 47 g/100 g,and the acid detergent fiber(ADF)content ranged from 16 to 23 g/100 g.Except'Yuqingzhu 23',other maize varieties reached the first-grade standard of silage maize.4)Four principal components were extracted by principal component analysis,the cumulative contribution rate was 88.99％,and the composite scores of 6 maize varieties such was positive,while the other 4 maize varieties were negative.In summary,'Lilong 915''Denghai 652''Yuqingzhu 23''Laiyu 721''Zhengdan 958'and'Dajingjiu 4059'are suitable for planting in the saline-alkali land of the Yellow River Delta.