Performance of Agronomic Characters and Yield of Maize Xianyu 335 in Regional Test of Spring Maize Medium Maturity Group in Northeast China from 2017 to 2021

In order to comprehensively evaluate the performance of maize variety Xianyu 335. In this study, maize Xianyu 335 was used as material to measure growth period, agronomic characters and yield in recent 5 years, and its coefficient of variation and significance were analyzed. The result showed that the seeding stage, tasseling stage, spinning stage and maturity stage of maize were delayed due to the drought environment during seed germination stage. The inter-annual coefficient of variation caused by climate change of these traits sorted in descending order was bald tip length ＞panicle position ＞ plant height ＞ yield ＞100-grain weight＞panicle length＞seed yield＞panicle row number. The variation coefficient of bald tip was highest, followed by that of those traits including ear position, plant height, and yield. The coefficient of variation of panicle length, panicle rows, 100-grain weight, and seed yield was less than 5%, indicating that these traits were relatively stable and not sensitive to climate change in the case of dry spring and less rain in summer from 2018 to 2019. The incidence of stalk rot disease was 13.65% in 2017. In 2018,drought environment at seed emergence stage, and excessive rainfall at jointing stage and grain filling stage, caused a high empty rod rate of 3.43% and a low yield of 11 770.50 kg·ha^-1, while the yield in other years was stable. Typhoon occurred in 2020,led to a high inversion and lodging rate. The results indicated that the characters of Xianyu 335 were different in 5 years, and the new hybrid combinations with its excellent characters can be used for the breeding of new varieties.