氮硫互作对越冬大葱生长及品质的影响

为探讨氮、硫对大葱生长及产量品质的影响,本文采用裂区试验设计,研究了盆栽砂培条件下越冬大葱对营养液氮、硫水平的响应特性。结果表明,随着氮水平的提高,大葱各器官生长量均显著增加,产量以N 16.00 mmol/L（N2）时较高,分别比N 4.00 mmol/L（N1/2）、 8.00 mmol/L（N1）时提高了50.09 %和22.46 %;而随硫水平的升高,大葱生长量亦呈增加趋势,但反应不如对氮敏感,产量以S 1.68 mmol/L（S1）、3.35 mmol/L（S2）时较高,继续增加硫浓度至6.69 mmol/L（S4）时则产量降低。尽管氮、硫对大葱主要内含物质的作用方向不尽相同,但大葱硫化物（以丙酮酸计）含量均随氮、硫供应水平的增加而显著增加,且合理增施氮、硫均可显著改善大葱的综合品质。氮、硫对大葱生长及产量品质存在显著的互作效应,综合分析表明,以营养液中N 16.00 mmol/L（N2）、S 3.35 mmol/L（S2）时最有利于大葱的生长及产量和品质的提高。

Influence of nitrogen and sulfur interaction on growth and quality of Chinese spring onion

In order to investigate effects of nitrogen and sulfur on growth, yield and quality of Chinese spring onion, the response characteristics of sand potted overwintering Chinese spring onion to N and S fertilization levels were studied by using the split plot design. The results show that the biomasses of onion organs are increased significantly with the solution N increasing, and the higher change of yield is under N 16.00 mmol/L（N2）, which is increased by 50.09 % and 22.46 % under the N 4.00 mmol/L（N1/2） and N 8.00 mmol/L（N1） respectively. Meanwhile the biomasses of all organs are also increased with solution S increasing, but the response is less sensitive than the response to N. The yields are higher while sulfur concentration are 1.68 mmol/L（S1） and 3.35 mmol/L（S2） levels, but the yields begin to decrease when the sulfur concentration reaches to 6.69 mmol/L（S4）. Although the main inclusion reacts differently in response to N and S levels, the organic sulfur compounds (EPY) are increased significantly as the increases of N and S levels. Moreover, combined application of N and S could significantly improve the Chinese spring onions comprehensive quality. The interaction effect of nitrogen and sulfur is significant on growth, yield and quality of Chinese spring onion. The results of comprehensive analysis show that the nutrient solution containing N 16.00 mmol/L（N2） and S 3.35 mmol/L（S2） is optimal to improving the growth, yield and quality of Chinese spring onion..