氮、硫供应对章丘大葱生长和含硫有机物含量的影响

以章丘大葱为材料，并以珍珠岩为栽培基质，采用盆栽试验研究了不同氮、硫供应水平对大葱生长前期的干物质累积及含硫有机物含量的影响。结果表明，氮、硫供应及其交互作用显著影响大葱生长和含硫有机物含量。在硫不足（SO42- 0.01 mmol/L）和硫充足（SO42- 4.00 mmol/L）供应条件下，随氮供应水平提高，大葱植株干物重明显增加，当供氮水平为N 6.0 mmol/L时，植株干物重及氮素吸收数量达到最大；增加硫素供应可显著提高植株的硫含量和总硫量。然而，硫供应不足时，随着供氮水平提高，植株含硫有机物含量逐渐下降；反之，充足供硫条件下，随着氮供应水平的提高，大葱含硫有机物含量出现先增加后降低。当供氮水平为N 12.0 mmol/L时，含硫有机物含量最高，达到7.23 μmol/g，FW。过量氮供应（N 24.0 mmol/L）则抑制植株生长，降低含硫有机物含量。因此，充足供硫条件下，氮素调控水平对保证大葱高产和高含硫有机物含量至关重要。

Effect of N and S supply on the growth and organo-sulfur compounds of Zhangqiu spring onion

Effect of N and S supply on the growth and organo-sulfur compounds of Zhangqiu spring onion was investigated in a potted soilless experiment. The results indicated the growth and organo-sulfur compounds of spring onion were influ-enced by N, S and their interactions significantly. N supply promoted plant growth and increased shoot N concentration and uptake, and S supply enhanced shoot S concentration and uptake. Concentration of organo-sulfur compounds de-creased with N supply increasing under deficient S condition, and sufficient N and S supply increased organo-sulfur con-centration. The highest organo-sulfur concentration (7.23 μmol/g, FW) was observed at N 12.0 mmol/L and SO2-4-4.00 mmol/L, however, excessive N supply (N 24.0 mmol/L) retarded plant growth and decreased concentration of organo-sulfur compounds. Therefore, N could regulate the growth and organo-sulfur compounds of Chinese spring onion with sufficient S supply.