辽宁省玉米改良的效果

对辽宁省过去30年主栽的玉米品种进行比较发现,玉米改良对玉米增产起了主要作用。品种的改良主要表现在果穗长度、行粒数、穗粒数、叶相、叶面积指数、抗倒伏和空秆、抗病性及喜肥耐密性等方面。但在提高品种的抗性、改善物质分配和创造理想株型方面还有待于出现新的突破性进展。

Achievements in Corn Improvement in Liaoning Province

A comparison of major corn varieties grown in Liaoning Province over the past 30 years showed that varietal improvement played a vital role in increasing corn yield.The improvement is reflected in an increase in earlength,numbers of kernels per ear row and per ear,and in leaf area index,in a decrease in leaf orientation value,as well as in enhancement of the plant's ability to resist lodging,barenness and disease,and to uptake nutrients and to tolerate closer planting density.