紫色土增施单质硫对大蒜生长发育和硫素营养的影响

对紫色土施用单质硫条件下大蒜生长发育及硫素营养吸收和代谢进行了研究。结果表明,大蒜株高、叶面积、经济产量(蒜头)和经济系数以中等供硫水平最高,而茎粗和生物产量则以高硫水平最大。大蒜能耐高浓度的硫素供应,在0～120kghm-2供硫情况下,其全硫(TS)、水溶性硫(SS)和无机硫(Io-S)含量均随供硫量的增加而上升,小分子水溶性含硫氨基酸含量(Ws-S)以低硫水平最高,而大分子蛋白质硫含量(Wis-S)以中等供硫水平时最高,与大蒜素含量的变化一致。大蒜素含量与不同硫组分比率的关系分析发现,大蒜素含量与Ws-S/TS呈极显著的正相关(r=0.752 ),与Io-S/SS呈显著的正相关(r=0.702 )。全氮含量与全硫含量变化趋势一致,全磷含量以低硫水平时最高,全钾含量以中等供硫水平时最高。

Effect of Sulphur Applied on the Purple Soil on the Growth and Sulfur Nutrition of Garlic(Allium Stativum L.)

The effect of sulphur rates supplied on the purple soil on the growth,development and sulphur absorption, metabolism of garlic(Allium Stativum L.) were studied in this paper. The results showed that the plant height, leaf area, economy yield(garlic burbles) and economy coefficient were to the top when the medium sulphur rate was supplied. But the stem diameter and biological production were upmost in the high sulphur level. The garlic could suffer very highr sulphur rate applied, under the surphur supply of 0-120kg ha~(-1), the total sulphur(TS), water-solubility sulphur(SS) and inorganic sulphur (Io-S) content of garlic rised following the sulphur supply. The small molecule sulphur in amino-acid (Ws-S) content were upmost under the low sulphur supply. But the big molecule sulphur in protein (Wis-S) content were to the tiptop in the medium sulphur supply, accorded with the variety of allicin of garlic. The relation between the allicin content and the ratio of different sulphur components were reviewed, and the best distinct positive correlation(r=0.752~(**)) between the Ws-S/TS and allicin content, and the distinct correlation(r=0.702~*) between the Io-S/SS and allicin content were found. Sulphur and nitrogen promoted each other. The phosphorus and the potassium conten were to the tiptop when the low and medium sulphur level applied, respectively.