硫对大豆生长发育及生理效应影响的研究

Study on the Effect of Sulfur on the Growth and Physiology of Soybean

采用砂培试验研究了硫素对大豆营养生长、营养元素吸收、氮硫比值和光合作用强度及酶活性等生理效应影响。结果显示,正常供硫能保证大豆生长发育和生理生化反应;不同生长关键时期低硫处理对大豆营养生长和生理效应均有一定不利影响。特别是苗期缺硫明显降低大豆生物量和营养元素的吸收,叶面积生长量不足,叶片中叶绿素含量下降,硝酸还原酶活性下降,硝态氮含量增加,氮代谢受阻,氮硫比值提高,严重影响大豆的正常生长发育。

The sand culture is used to study the effects of sulfur on the soybean growth, the absorption of nutrients,the N:S,the rate of photosynthesis and the enzymes activities. The growth and physiology of soybean are regulatr with normal sulfur, declined under the stress of sulfur in different key growth stages.The biomass,the rate of leaf area,the absorption of nutrients,the content of chlorophyll,the rate of photosynthesis and the activity of nitrate deoxidize enayme are decreased mostly, the content of nitrate-N and the N:S are increased under sulfur stress.