Abstract:

In order to effectively improve frost resistance to spring low temperature of winter wheat, we studied the contribution sequence of different cultural factors related to yield of winter wheat in spring low temperature years by uniform experiment design, stepwise regression and general contribution method. The results showed that, the influence order of different cultural factors on yield was: base phosphorus(P2O5) quantity＞pure nitrogen quantity topdressing at rising stage＞base pure nitrogen quantity＞plant density or irrigation quantity before sowing＞irrigation quantity at rising stage＞base potash(K2O)＞irrigation quantity at filling stage or interval days between irrigation time at filling stage and maturity ; the contribution of coupling factors existing positive interaction effect were also listed in an descending sequence as: plant density and irrigation quantity before sowing＞base pure nitrogen quantity and pure nitrogen quantity topdressing at rising stage＞pure nitrogen quantity topdressing at rising stage and irrigation quantity＞irrigation quantity at filling stage or interval days between irrigation time at filling stage and maturity ; there was negative interaction effect between base pure nitrogen quantity and base pure potash(K2O) and it cleared the best combination of the different cultural factors for the highest yield (3692.34 kg/hm2). The study has provided theoretical and technical support for achieving high yield in spring low temperature years.