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作 者 ：吕长文 赵勇 唐道彬 王季春 何凤发 张凯

期 刊 ：植物营养与肥料学报 2012年 18卷 2期 页码：475-482

关键词：甘薯；氮；钾；积累与分配；产量性状；相关性；

Keywords:sweet potato, nitrogen and potassium, accumulation and translocation, yielding trait, correlation,

摘 要 ：试验对6个不同类型甘薯品种的氮、钾积累动态、地上部与地下部氮、钾的分配差异进行了系统研究，同时分析了氮、钾含量与产量性状的关系。结果表明，不同甘薯品种藤蔓的氮含量自块根形成后逐渐下降，其干物质氮含量仅为2%左右，而块根氮含量在整个块根膨大期间变化较小，且前、后期含量基本一致。藤蔓和块根钾含量在块根膨大期间也相对稳定。藤蔓氮含量极显著高于块根氮含量；藤蔓与块根中的钾含量则相反。在不同类型甘薯之间，高淀粉类型（HS）品种块根干物质氮含量在0.68%～0.86%之间，藤蔓氮含量在1.98%～3.32%之间，低淀粉类型（LS）品种块根与藤蔓氮含量分别在0.69%～0.86%和2.00%～3.17%之间，但无论是藤蔓还是块根，氮含量在不同类型品种间无显著差异；高淀粉类型品种的块根钾含量为5.83%～6.66%，藤蔓钾含量为3.19%～3.70%，而低淀粉类型品种的块根与藤蔓钾含量分别为6.12%～6.36%与3.48%～3.90%。相关分析表明，对所有品种来说，块根的钾含量与其氮含量之间呈显著正相关，藤蔓的钾含量与根冠钾含量之比也达到了显著负相关；就高淀粉类型品种而言，藤蔓氮含量与干率之间、根冠钾含量之比与商品薯率之间均为极显著正相关，块根钾含量与生物产量呈显著负相关；低淀粉类型品种的藤蔓氮含量与生物产量呈显著正相关关系，藤蔓钾含量与生物产量、淀粉产量分别呈极显著正相关和显著负相关关系。

Abstract:The experiment systematically researched the dynamic changes of nitrogen and potassium accumulations, the difference of their translocations between vines and tuberous roots in 6 types of sweet potato. The relationships between N and K contents and yielding characters were analyzed. The results suggest that the nitrogen contents of the vines of all sweet potato cultivars are decreased gradually after tuberous root formation, the content is about 2% in vines, and the nitrogen contents in tuberous roots are changed a little during thickening. The potassium contents both in vines and in tuberous roots are relatively stable. For the distributions of nitrogen and potassium, the N content in vines is far more than that in tuberous roots, while the K content in tuberous roots is far more than that in vines. For the high-starch types, the N contents of tuberous roots are from 0.68% to 0.86%, and those of vines are from 1.98% to 3.32%. For low-starch types, the N contents of tuberous roots and vines are from 0.69% to 0.86% and from 2.00% to 3.17% respectively. Correspondingly, for the high-starch types, the K contents are from 5.83% to 6.66% and from 3.19% to 3.70%, and for the low-starch types, the K contents are from 6.12% to 6.36% and from 3.48% to 3.90%. For the all types, the K contents in roots are significantly and positively related with the N contents in roots, and the K contents in vines are closely related with the K ratios of R/T negatively. For the high-starch types, there are significantly and positively correlation between the N contents in vines and percentages of dry matter, and between K ratios of roots to tops and commercial percentages, while there is remarkably negative correlations between the K contents of roots and biomass. For the low-starch types, there are markedly positive correlations between the N contents in vines and biomass, and between the K contents in vines, biomass and starch yield, while there is notably negative correlation between the K contents in vines and starch yields.

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