Identification and allelopathy on the decomposition products from soybean stubs
大豆根茬腐解产物的鉴定及化感作用的初步研究

Acid and basic components of organic compounds from soybean stubs decomposed for two weeks and four weeks in culture experiments were identificated and the allelopathy of compounds from the decomposed stubs for two weeks,four weeks and eight weeks was studied by GC MS analysis.The results showed that the decomposition products from soybean stubs(including organic compounds in rhizosphere soil)were abundant,and they included organic acids,ester,alcohol,aldehydes,phenol,acetone and hydrocarbon.Some of them are allelochemicals and some organic compounds had not been documented as allelochemicals yet.There were definite differences in organic compounds from different decomposition time.Acid and basic components from soybean stubs decomposed for two weeks,four weeks and eight weeks all inhibited the germination of soybean seeds and radicle growth.The differences of radicle length were significant between the group treated with the components from decomposed soybean stubs and control group.Allelopathy inhibition of acid components is stronger than that of basic components.In addition,some actions of the decomposition products from soybean stubs in continuous cropping barriers were discussed.