氮硫互作对大葱氮、磷、钾、硫吸收分配特性的影响

Influence of interaction between nitrogen and sulfur on N,P,K and S absorption and distribution of Chinese spring onion

为探讨氮硫互作对大葱植株矿质营养状况的影响，本文采用裂区试验设计，研究了营养液不同氮（N）、 硫（S）水平对盆栽沙培大葱生长量及氮（N）、 磷（P）、 钾（K）、 硫（S）吸收分配特性的影响。结果表明，营养液N、 S水平显著影响大葱根、 假茎及叶片N、 P、 K、 S含量，植株干物质及N、 P、 K、 S 的吸收积累量均随营养液N、 S水平升高而显著增加，当硫水平超过6.69 mmol/L（S4）时，植株干物质量开始降低，对N、 P、 K、 S的吸收积累量也相应下降，虽然S4较S0（0.01 mmol/L）处理仍增加显著，但较S1（1.68 mmol/L）干物质重量降低了7.97%，对N、 P、 K、 S的吸收积累量也分别降低了16.37%、 10.24%、 9.06%、 5.77%。营养液N、 S水平及其交互效应（N×S）对大葱N、 P、 K、 S 在不同器官的分配多有显著影响，但硫的影响远不及氮明显。综合分析表明，以营养液氮水平16.00 mmol/L、 硫水平为1.68~3.35 mmol/L时最有利于改善大葱的矿质营养水平，并促进其干物质的积累。

Using split plot design, a pot experiment with sand culture was conducted to investigate the effects of nitrogen and sulfur interaction on adsorption of N, P, K and S nutrients in Chinese spring onion under different N and S level. The results showed that the different concentrations of N and S had significant influence on the N, P, K and S contents in each onion organ. With increases of N and S level in the nutrient solution, the dried matter and the uptake of N, P, K and S in plant was significantly raised, and the dried matter decreased when 6.69 mmol/L of sulfur level was supplied （S4）. Though it was significantly higher than the treatment for 0.01 mmol/L （S0）, the dry matter and absorption of N, P, K and S in S4 treatment were lower than that in 1.68 mmol/L （S1） treatment, and lowered by 7.97%, 16.37%, 10.24%, 9.06% and 5.77% respectively. The effects of the N and S levels and their interaction were significant on the N, P, K and S distribution in almost organs of Chinese spring onion, while the response to S level was less sensitive than N level. In conclusion, for improving the mineral nutrition status and the dry matter of Chinese spring onion, the nutrient solution containing N 16.00 mmol/L and S 1.68-3.35 mmol/L is an optimal choice.