作物学报 ›› 2024, Vol. 50 ›› Issue (8): 2025-2038.doi: 10.3724/SP.J.1006.2024.32061
宋志文1(), 赵蕾1, 毕俊国2, 唐清芸1, 王国栋3,*(
), 李玉祥1,*(
)
SONG Zhi-Wen1(), ZHAO Lei1, BI Jun-Guo2, TANG Qing-Yun1, WANG Guo-Dong3,*(
), LI Yu-Xiang1,*(
)
摘要:
研究滴灌条件下施氮量对不同氮效率品种关键生育时期干物质积累和氮素吸收转运及产量的影响, 为干旱半干旱区滴灌水稻高产高效生产提供技术参考。试验于2021—2022年开展, 以氮高效品种(T-43)和氮低效品种(LX-3)为供试材料, 采用裂区设计; 设置4个施氮水平, 分别为N0 (0 kg hm-2)、N1 (150 kg hm-2)、N2 (300 kg hm-2)和N3 (450 kg hm-2)。分析滴灌水稻在抽穗期和成熟期干物质积累、氮素吸收利用及产量对施氮量的响应差异。结果表明: (1) 施用氮肥可以增加滴灌水稻干物质积累量(1.99%~26.02%)和氮素积累量(25.67%~97.69%), 提高水稻产量(23.75%~66.75%); 但过量施氮(450 kg hm-2)会减小对干物质积累的促进作用, 导致结实率和穗粒数下降, 使氮素主要集中在秸秆中, 最终降低水稻对氮素的利用效率。(2) 在同一施氮条件下, T-43的有效穗数、结实率、抽穗期叶片和穗部干物质及氮素积累量均高于LX-3 (分别为1.65%~5.19%、0.42%~8.47%、7.61%~19.68%、19.81%~40.73%、19.81%~30.23%和20.14%~49.65%), 最终产量高于LX-3 (4.23%~28.47%)。(3) 氮素利用效率对施氮量的响应存在品种间差异(P<0.05)。与LX-3相比, T-43有更高的氮肥农学利用效率、氮素回收率和氮肥偏生产力(分别高1.05%~25.23%、5.86%~20.05%和10.09%~18.01%)。综上所述, 在滴灌栽培条件下, 选用氮高效品种(T-43), 配施300 kg hm-2氮肥表现出更佳的氮素吸收转运能力和更高的产量, 能更好地利用养分资源, 是本试验最佳的品种和施氮量组合方式。
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