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收获期对芒属植物杂交种生物产量与氮磷钾含量的影响

DOI: 10.3969/j.issn.1000-7091.2013.03.021, PP. 116-120

Keywords: 芒属植物,收获期,生物产量,氮磷钾含量

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Abstract:

以3个芒属植物杂交种为材料,研究了收获期对芒属植物杂交种植物学性状、生物产量与氮磷钾含量的影响。结果表明,随着收获期的推迟,3个品种生物产量均呈下降趋势,湘杂芒2号和湘杂芒3号自10月20日开始显著下降,而湘杂芒1号自11月20日才开始显著下降,至12月20日,3个品种生物产量仍在40t/hm2以上,至次年1月20日,3个品种生物产量分别为40.6,38.8,31.6t/hm2;3个品种叶片SPAD值与植株含水量均从10月20日开始表现下降趋势,但二者的显著下降时期均存在品种间差异;3个杂交种的氮、磷、钾含量自10月20日开始下降,但氮、钾含量的大幅度下降时期具有品种间差异。3个杂交种平均来看,氮磷钾含量分别从10月20日的1.1%,0.15%,0.76%下降到1月20日的0.32%,0.07%,0.20%。综合叶片SPAD值、植株含水量、生物产量、植株氮磷钾含量与累积量等因素,湘杂芒2号适宜收获期应在11月20日以后,而湘杂芒3号与湘杂芒1号应在12月20日以后。

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