钠钾替代对甜菜幼苗生长及养分吸收的影响

Effect on the growth and nutrient elements absorption of the sugar beet seeding under the replacement of potassium by sodium

以甜菜ST13092为供试品种,采用室内营养液水培方式,研究了不同程度钠替代钾条件下甜菜生长和养分吸收的状况。结果表明,50%和99%的钾被钠代替后,株高和水势明显降低;50%钾被钠替代后,叶面积和相对含水量较对照没有明显变化,但99%钾被替代后,叶面积和相对含水量降低明显;50%的钾被钠替代后,各部分的干物质积累与对照相比没有明显差异;钠钾替代效率以根系和叶柄最高,达到了近99%,叶片次之,为92%,整株的替代效率为95%;随着钠替代钾比例的升高,甜菜体内的K+含量及积累量明显降低,Na+含量及积累量明显升高;环境中Na+的增加提高了甜菜根系和叶片中氮素的含量,但对磷含量的影响不大。

This study focused on growth and nutrient elements absorption of sugar beet ST13092 with the replacement of potassium by sodium at different degrees using hydroponic culture. The results showed that the plant＇s height and water potential obviously decreased when 50% and 99% of potassium was replaced by sodium under this experiment condition. Compared with the CK,there was no obvious difference in the leaf area and relative water content after 50% of potassium was replaced by sodium. But the leaf area and relative water content significantly decreased after 99% of potassium was replaced by sodium compared with CK. After 50% of potassium was replaced by sodium,there was also no obvious difference in accumulation of dry material at different parts; the replacement efficiencies of root and petiole were large as nearly 99%; the replacement efficiency of blade was 92 %; and the replacement efficiency of the whole plant was 95%. With increase of sodium replacement,the content and accumulation of K＋obviously decreased,however,the content and accumulation of Na＋obviously increased in sugar beet. The nitrogen content of sugar beet roots and leaves showed the same co-relationship with Na＋in the environment,which had little influence on the phosphorus content.