作物学报 ›› 2025, Vol. 51 ›› Issue (1): 207-220.doi: 10.3724/SP.J.1006.2025.41025
所属专题: 小麦:耕作栽培·生理生化
张军1,2(
), 胡川1, 周起晖1, 任开明1, 董誓言1, 刘傲寒1, 吴金芝1, 黄明1,*(
), 李友军1,*(
)
ZHANG Jun1,2(
), HU Chuan1, ZHOU Qi-Hui1, REN Kai-Ming1, DONG Shi-Yan1, LIU Ao-Han1, WU Jin-Zhi1, HUANG Ming1,*(
), LI You-Jun1,*(
)
摘要:
探究减氮及有机肥替代对旱地冬小麦产量形成和经济效益的影响, 为实施化肥减量和有机肥替代提供理论和技术依据。2021—2023年度, 基于2019年开始设置在黄土高原和黄淮海平原交汇处典型旱地冬小麦产区(河南洛宁和河南孟津)的定位试验, 研究了冬小麦干物质积累转运分配特性、氮肥干物质生产效率、产量及其构成要素和经济效益。试验设置不施氮肥(NN)、农户施氮(FN)、基于FN减氮20% (RN)和RN基础上20%氮肥用有机肥替代(OSN) 4个处理。结果表明: (1) 与FN相比, RN处理降低了小麦拔节期、开花期和成熟期的干物质积累量、花前干物质转运量以及成熟期茎鞘、穂轴+颖壳和籽粒的干物质分配量, 但对籽粒产量无显著影响。(2) 与FN和RN相比, OSN处理提高了各生育阶段的氮肥干物质生产效率, 从而增加了拔节期、开花期、成熟期的干物质积累量, 而且提高了花前干物质转运量、花后干物质积累量、花后干物质积累量对籽粒的贡献率, 进而使成熟期地上部各器官的干物质分配量均得到显著提高, 最终使籽粒产量分别显著增加15.03%和17.12%, 经济效益增加3.84%和4.23%。(3) 小麦产量与花前干物质转运量、花后干物质积累量和花后干物质积累量对籽粒的贡献率呈极显著正相关, 与花前干物质转运量对籽粒的贡献率呈极显著负相关。综上, 在雨养条件下, 小麦季施氮量为172 kg hm-2 (夏休闲-冬小麦)和192 kg hm-2 (夏玉米-冬小麦)的基础上, OSN处理提高了氮肥干物质生产效率, 增加各生育时期的干物质积累量, 其花前干物质转运量和花后干物质积累量的协同增加使其获得了最高产量, 实现增产增收, 适宜在产量水平为5000 kg hm-2的雨养旱地冬小麦高产栽培中应用。
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