高产玉米新品种登海661的高产特性研究

通过不同玉米品种比较,研究玉米新品种登海661的高产特性,为超高产玉米育种和栽培提供科学依据。结果表明,登海661的穗大、粒重,单株子粒产量高,分别较郑单958和农大108高25%和30%;干物质积累量大,与郑单958和农大108的差异主要表现在花后;叶面积指数高值持续期较长,在生育后期下降速度慢。登海661的株高、穗位高分别较郑单958和农大108低18.53%、22.68%和51.97%、48.03%,穗高系数显著低于郑单958和农大108;穗部及上下两节间较短,抗倒伏,耐密植。

Study on High Yield Characteristics of New Maize Variety Denghai661

In order to provide the scientific basis for maize cultivation and breeding of super high yield, high yield characteristics of new maize variety Denghai661 were studied with the comparisons of different maize varieties. The results showed that Denghai661 with big panicles and heavy grains, the grains yield per plant of Denghai661 was 25% and 30% higher than that of Zhengdan958 and Nongda108. Dry matter accumulation of Denghai661 was bigger than those of Zhengdan958 and Nongda108, the difference was mainly manifested after the flowering stage. Leaf area index (LAI) of Denghai661 decreased slowly and kept higher in late growth period. The plant height and ear height of Denghai661 were 18.53%, 22.68% and 51.97%, 48.03% respectively lower than those of Zhengdan958 and Nongda108. Ration of ear to plant height of Denghai661 was significantly lower than that of Zhengdan958 and Nongda108. The ear node, superior node and interior node of Denghai661 were short and Denghai661 resident to lodging and tolerate to high planting density.