STUDY ON ALLELOCHEMICALS IN THE PROCESS OF DECOMPOSITION OF WHEAT STRAW BY MICROOGANISMS AND THEIR BIOACTIVITY
小麦根区微生物分解小麦残体产生的化感物质及其生物活性的研究

Wheat straw of mature period was decomposed under laboratory conditions:pH5,pH7 and pH8 by microoganisms. Filtrates of rotted wheat straw after 1 day,1 week,2 weeks and 4 weeks of incubation were tested for bioassay,and their some extracts obtained under acidic and basic conditions were analysed by GC-MS. It was found that allelopathic effects of extracts on the germination of wheat and maize seeds are obviously dependent on the period of decomposition, pH value and variety of crops.All acidic extracts showed inhibition to the germination and root growth to some degree.All basic extracts showed a little inhibition or some simulation to seed germination and root growth. The samples of 1 day incubation under pH5 (A),pH7(A),and pH8(A) have shown a obvious inhibition(p