不同叶龄喷施金得乐对玉米茎秆生长发育的影响

Effects of Spraying Jindele at Different Leaf Ages on the Growth and Development of Stem in Summer Maize

[目的]明确沿淮地区夏玉米喷施化控剂金得乐的对茎秆特性的影响。[方法]在6叶龄至抽雄期内喷施450 mL/hm 2金得乐对水225 kg/hm 2,研究不同叶龄期喷施化控剂金得乐对玉米不同节间长度、产量、穗行数、行粒数和千粒重的影响。[结果]6叶龄喷施金得乐显著缩短基部第5~8节节间长度;7~11叶龄前喷金得乐均能显著缩短第5~13节节间即穗下节间长度,随着叶龄的增大,喷施金得乐主要影响上部节间的长度,至18叶龄喷施金得乐显著缩短穗上部节间长度。产量、穗行数、行粒数和千粒重随喷施叶龄的增加呈先下降后上升的变化趋势,产量与第7和第8节间长度呈显著正相关关系。[结论]6~8叶龄喷施金得乐为喷施化学调控剂的安全时期。

[Objective]To investigate the best leaf age to spray plant growth regulator Jindele of summer maize along Yanhuai River.[Method]We spray plant growth regulator Jindele 450 mL/hm 2 plus 225 kg/hm 2 of water during the period of 6 leaf age to tasseling stage,in order to investigate the effects of spraying plant growth regulator Jindele on internode length,yield,ear row number,grain number per row and 1 000-grain weight.[Result]Spraying plant growth regulator Jindele at the 6 leaf age significantly decreased the 5th to 8th internode length,and spraying plant growth regulator Jindele during 7 to 11 leaf age significantly decreased the 5th to 13th internode length.As the leaf age increased,spraying plant growth regulator Jindele mainly affected the length of the upper internode,and spraying plant growth regulator Jindele at 18th leaf age significantly decreased the above-ear internode length.With the increase of leaf age,the yield,ear row number,grain number per row and 1 000-grain weight decreased firstly and then increased,and the grain yield significantly correlated with the 7th and 8th internode length.[Conclusion]The 6 to 8 leaf ages were the safety leaf age to spray plant growth regulator Jindele.