大豆硫营养

SULPHUR NUTRITION OF SOYBEAN

水培矮脚早大豆研究表明：大豆生育适宜的硫量为０．１ｍＭｏｌ．Ｓ．Ｌ－１，能促进干物质积累。不同硫水平营养器官干物质分配率（ＰＲＤＭ）均是成熟期低于前期。种子中ＰＲＤＭ与硫量负相关。器官中硫含量高低依种子、叶、茎、根、荚皮顺序递减。硫有促进共生固氮功能，荚期茎部酰脲及酰脲丰度以０．５ｍＭｏｌ．Ｓ．Ｌ－１处理最高。缺（低）硫处理器官酰脲与硝态氮增加。花期功能叶与非功能叶全硫量分别低于０．１２％，０．０８％为大豆缺硫参考指标。

Study of sulphur on soybean variety Aijiaozao by water culture showed that the suitable S application level for soybean growth and development is 0.1Mmol S/L. It can increase the accumulation of dry matter. Under different S levels the distribution ratio of dry matter of organs in harvest stage is lower than that of the former growth stage. The order of S content in organs in seed>leaves>stems>roots>pod shells. S application can improve the function of symbiotic nitrogen fixation. The urdides and relative abundance of ureides in stems at pod stage are the highest at the level of 0.5Mmol S/L. S deficiency can increase the content of ureides and nitrate nitrogen of organs. When the S content of functional leaves and non-functional leaves at flowering stage are lower than 0.12% and 0.08% respectully, they can be regarded as critical index of soybean S deficiency.