CAJ | 학술논문

以泰农18为试材，在播种密度（基本苗）405．0万株/hm2条件下，研究两个不同地力水平和适度早播（10月1日）、适播（10月8日）和适度晚播（10月15日）对冬小麦籽粒产量和氮素利用率的影响。结果表明：高地力水平下小麦籽粒产量较高但氮素利用率偏低；同地力条件下，适当推迟播期，通过协调单位面积穗数和穗粒数，仍可维持与早播和适播条件下相当水平的籽粒产量；虽然推迟播期降低冬小麦氮素吸收效率，但可提高氮素利用效率，两者互补，所以适当推迟播期氮素利用率仍可维持与早播和适播相当的水平。因此，在不同地力水平下，适当推迟播期可以调控冬小麦冬前群体免受冷害和寒害的影响，维持较高的籽粒产量和氮素利用率。
이태농18위시재，재파충밀도（기본묘）405．0만주/hm2조건하，연구량개불동지력수평화괄도조파（10월1일）、괄파（10월8일）화괄도만파（10월15일）대동소맥자립산량화담소이용솔적영향。결과표명：고지력수평하소맥자립산량교고단담소이용솔편저；동지력조건하，괄당추지파기，통과협조단위면적수수화수립수，잉가유지여조파화괄파조건하상당수평적자립산량；수연추지파기강저동소맥담소흡수효솔，단가제고담소이용효솔，량자호보，소이괄당추지파기담소이용솔잉가유지여조파화괄파상당적수평。인차，재불동지력수평하，괄당추지파기가이조공동소맥동전군체면수냉해화한해적영향，유지교고적자립산량화담소이용솔。
The cultivar Tainong 18 was sowed on three dates ( conventional sowing on October 8, early sowing on October 1 and delayed sowing on October 15) under low or high fertility level with plant density of 4.05 million/hm2.Under high fertility, higher grain yield but lower nitrogen use efficiency (NUE) was ob-served.Under the same fertility level , properly sowing later could maintain the grain yield equivalent to that of early and conventional sowing through coordinating spikes per unit area and grains per spike .Delayed sowing resulted in lower nitrogen uptake efficiency ( UPE ) but higher nitrogen utilization efficiency ( UTE ) , so the offset led to its equivalent NUE to the other sowing date treatments .Delayed sowing under both low and high fertility level could protect winter wheat from cold damage , so the higher grain yield and NUE could be main-tained.