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秦梦倩1,宁宁2,程泰3,李康丽4,张新贝4,赵鑫月1,张哲5,赵杰1,蒯婕1,王晶1,汪波1,徐正华1,*,周广生1
QIN Meng-Qian1,NING Ning2,CHENG Tai3,LI Kang-Li4,ZHANG Xin-Bei4,ZHAO Xin-Yue1,ZHANG Zhe5,ZHAO Jie1,KUAI Jie1,WANG Jing1,WANG Bo1,XU Zheng-Hua1,*,ZHOU Guang-Sheng1
摘要:
为明确磷肥用量对迟播油菜产量形成及磷肥利用效率的影响,本试验以品种华油杂137为材料,连续2年在武汉进行磷肥用量单因素试验,研究迟播油菜产量形成及磷肥利用效率。结果表明:施用磷肥显著增加迟播油菜产量,单株角果数是迟播油菜产量的主要影响因子(P < 0.05)。2年试验结果中产量分别比对照P0处理提高了16.83%~24.63%和22.99%~34.68%,单株角果数分别比P0处理提高了14.51%~37.46%和26.35%~53.83%。油菜株高、根颈粗、角果层厚度、有效分枝高度、分枝数、磷含量、磷积累量、干物重及抗倒伏能力均呈现先增加后稳定的趋势,在P3 (120 kg hm?2)、P4 (150 kg hm?2)处理时无显著差异。随着磷肥用量的增加,磷肥利用率呈现先增后减的趋势,在P2 (90 kg hm?2)处理达到最大;磷肥偏生产力随磷肥用量增加而下降;磷肥农学利用率在P2、P3处理下达到最佳;磷肥贡献率在P3和P4处理下达到最佳。综上所述,施磷提高了迟播油菜的产量、干物质重、抗倒伏能力和磷肥利用效率,但继续增加磷肥用量时,磷肥的利用效率降低,同时对产量、干物质重及抗倒伏能力无显著影响。因此,在保证油菜稳产、抗倒的前提下,磷肥用量在P3水平时利于提高迟播油菜产量、抗倒伏能力和磷肥利用效率。
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