播期与播量互作对周麦42号农艺性状及产量形成的调控效应OA

[Objective]To clarify the optimal combination of sowing date and sowing rate for Zhoumai 42 and achieve precise,high-yield culti-vation.[Method]Five sowing dates(October10-30)and five sowing rates(112.5-262.5 kg/hm2)were established,and a two-factor ran-domized complete block design was adopted to systematically investigate the effects of sowing date,sowing rate,and their interaction on agro-nomic traits and yield formation.Using two-factor analysis of variance,correlation analysis,regression modeling,and cluster analysis,the mechanisms by which each factor influences yield were elucidated.[Result]Sowing date,sowing rate,and their interaction all significantly af-fected the yield of Zhoumai 42(P＜0.05).Correlation analysis revealed that effective tiller number(r=0.335),panicle number(r=0.751),and grain number per panicle(r=0.430)were the key agronomic traits associated with yield.The standardized regression equation—yield=-2276.611+11.061×panicle number+122.045×grain number per panicle—exhibited strong predictive performance(R2=0.816,SE=622.574 kg/hm2).Cluster analysis grouped the 25 treatment combinations into three clusters:group I comprised medium-yield combinations(14 treatment combinations,mean yield=7 991.7 kg/hm2),group II included low-yield combinations(5 treatment combinations,mean yield=6 972.3 kg/hm2),and group III consisted of high-yield combinations(6 treatment combinations,mean yield=8 716.4 kg/hm2).[Con-clusion]Under medium-to-high fertility conditions in the Huang-Huai-Hai wheat-growing region,the optimal sowing date for Zhoumai 42 is Oc-tober 15-20,and the recommended sowing rate is 150.0-225.0 kg/hm2.