Abstract: In order to screen suitable silage corn varieties suitable for cultivation in Haihe Low Plain.The yield,agronomic characters,quality and stress resistance of 14 maize varieties (silage and common) were evaluated by random block design.The results showed that the plant height and ear height of the varieties were 246.7-322.8 cm and 86.2-148.9 cm,Yayu Silage 79491 was the highest,Zhengdan 958 were the lowest;The dry matter yields of the tested varieties was 14.46-22.19 t/ha,the difference among varieties was very significant (P <0.01),the biological yields of Yayu Silage 79491,Zhengdan 175,Beinong Silage 308 and Beinong Silage 2932 were higher,increased by 28.35%,20.43%,20.06% and 10.09% than Zhengdan 958 respectively.The period of maize growth were significantly correlated with the dry matter yield from milk-ripening to wax-ripening stages, R=0.77^**,plant height was significantly correlated with biomass yield, R=0.62^*;There was a significant difference in feed quality between varieties (P <0.01),Zhongdi 175,Zhengdan 958,Xianyu 335,Hengyu 321 and dual-purpose varieties of Xunqing 518 as common corn,the remainder were counted as silage varieties,the content of neutral detergent fiber and acid detergent fiber in common maize was 2.59% and 4.58% lower than that of Silage Maize,The content of soluble sugar and starch was 2.06% and 2.12% higher than that of silage corn;The number of green leaves was 11.1-13.8 and fresh dry ratio was 30.23%-39.15% at harvest time.In addition to Beinong Silage 308,Yayu Silage 79491 and Xianyu 335 lodging and stem broken rate >15%,all the other 11 varieties of corn accorded with the national quality indexes classification standards,and the silage quality above the 2 rank evaluate stand,the 4 hybrids of Enxiai 298,Zhongnongda Silage Gr4515,Liaodan Silage 625 and Xunqing 518 achieved first rank silage quality standards.In order to promote the adjustment of corn planting structure,Zhongdi 175 and so on common corn varieties,as common corn,whole plant silage and grain feed type corn,have a good prospect for multipurpose development and popularization.

Key words: Silage maize, Grain and feed, Agronomic traits, Quality

CLC Number: 

• S322

• S513.01