浅埋滴灌下矮壮素对玉米生长发育和产量的影响OA

A field experiment was conducted in 2025 at the experimental base of Qiqihar Branch,Heilongjiang Academy of Agricultural Sciences to address long-standing issues in maize production in the semi-arid region of Western Heilongjiang,including seasonal drought,low water and fertilizer use efficiency,and increased lodging risk.Under the condition of integrated water-fertilization via shallow-buried drip irrigation,the maize variety DY009 was used as test material,two treatments were set up,as control(CK,no chlormequat chloride application)and chlormequat chloride application(CCC).The study systematically investigated the effects of chlormequat chloride chemical control on maize growth,key nitrogen metabolism enzyme activities,and yield formation under shallow-buried drip irrigation.The results showed that chlormequat chloride treatment(CCC)significantly reduced plant height(by 19.74％at maturity)and ear height(by 19.84％at maturity),enhanced stem strength(stem diameter increased by 1.60％-4.29％),and improved lodging resistance.It also increased the activity of key nitrogen metabolism enzymes at the big flare stage(e.g.,glutamine synthetase activity increased by 11.09％),promoted nitrogen uptake and utilization,and significantly maintained canopy photosynthetic capacity in the later growth stage(leaf area index increased by 18.08％).Ultimately,with stable ear traits,maize yield was increased by 612.60 kg·ha-1.