植物生长调节剂复配腐植酸对玉米茎秆强度、籽粒灌浆及产量的影响OA

Reasonably increasing the grain weight per plant and the planting density helps improve maize yield,but excessive density tends to cause problems such as lodging and inhibition of ear development.Using maize variety Xianyu 335 as the experimental material,under high-density(82 500 plants/ha)planting conditions,ethephon(ETH,500 mg/L)+diethyl aminoethyl hexanoate(DA-6,25 mg/L)(ED)or brassinolide(BR,100 mg/L)(EB)were sprayed at the jointing stage in combination with humic acid(HA)at concentrations of 0(1),200(2),400(3),600(4),and 800 mg/L(5).A total of 11 treatments(with commercial regulator Yuhuangjin as the control,CK)were established to study their regulatory effects on stalk strength,grain filling,and yield.The results showed that during the growth period,ED3 and ED5 treatments significantly increased stem diameter,with an average increase of 2.93%-3.74%compared with CK.Compared with CK,the puncture strength of EB3 and ED3 treatments significantly increased by 9.80%and 14.46%,while the crushing strength significantly increased by 9.32%and 14.09%,respectively.The 100-grain weight of ED3 and EB4 treatments increased by 3.95%and 2.33%compared with CK,respectively.The 100-grain weight was extremely significantly positively correlated with grain filling parameters Vmax,Wmax,and Va,and significantly positively correlated with W2 and V2.ED3 treatment showed the best promotion effect on grain filling parameters.The yields of ED3 and EB4 treatments increased by 4.69%and 5.40%compared with CK,respectively.In conclusion,ED3 and EB4 treatments significantly enhanced stalk strength,improved lodging resistance,and optimized the grain filling process,thereby significantly increasing maize yield.These treatments are recommended for the high-density planting pattern used in this study.