Discriminate of Maize Varieties Test in Liaoning Province and Feedback to Breeding

The maize varieties experiments in Liaoning Province from 2005 were analyzed.The conclusions showed that maize yield would be improved by taking full advantage of natural conditions since the growth period of maize varieties was shorten;Maize yield was improving as the density increases,the highest yield was found in the treatment which density was 57 000~60 000 plants per hectare.Low overall quality of tested varieties showed the lack of superior breeding materials basis;More resistance and yield stability were the basis of varieties for large-scale extension.The suggestions were as follows:(1) To adjust breeding objective,which stem changed from tall to medium or short,ear from big to medium or medium-big,planting density from sparse to close,mature period from late to medium or medium-late,mechanization from low to high.(2) To make great effort to the accumulation of basic materials which mature period were short and planting density was close.(3) To improve the awareness of resistance of varieties and yield stability.