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Effects of N,P, K on Activity of Key Enzymes for Carbon and Nitrogen Metabolism and Economic Benefit of Flue-cured Tobacco
Author(s): 
Pages: 181-185
Year: Issue:  4
Journal: Acta Agriculturae Boreali-Sinica

Keyword:  氮磷钾烤烟碳氮代谢产量产值;
Abstract: 为探讨氮、磷、钾肥对烤烟碳氮代谢关键酶活性及其经济效益影响,采用田间小区试验,测定了缺氮、缺磷、缺钾和氮磷钾正常(CK)处理烤烟不同生育时期碳氮代谢关键酶即硝酸还原酶(NR)、谷氨酰胺合成酶(GS)、蔗糖磷酸合成酶(SPS))、蔗糖合成酶(SS)和转化酶(INV)的活性变化.结果表明:在烟叶的氮代谢过程中,NR活性主要在烟叶生长发育前期起作用,与CK相比,氮、磷、钾素缺乏分别使烟叶NR活性下降35.9%,13.4%,19.5%,但移栽后85 d无差异显著性;在碳代谢过程中,SPS,SS和INV活性主要在烟叶生育中期起作用,缺氮能显著降低碳代谢关键酶活性,而缺磷、钾素则表现不明显,很可能与试验田磷钾含量较高有关.缺氮处理对烟叶的产量、产值影响最大,与CK处理相比,分别降低了19.7%,13.2%,缺磷、钾素处理与CK差异不显著.因此,烤烟为达到优质高产,首先要确保氮肥供应充足,同时要适当控制磷钾肥用量.
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