Variation of Soil Mycoflora in Decomposition of Rice Stubble from Rice-wheat Cropping System

Abstract

The colonization pattern and extent of decay produced in paddy stubble by soil inhabiting mycoflora were done by using nylon net bag technique. Among the three methods used for isolation of fungi, dilution plate technique recorded the highest number of fungi followed by damp chamber and direct observation method. Nutrient availability and climatic conditions (temperature, humidity and rainfall) influenced the occurrence and colonization pattern of fungi. Maximum fungal population was recorded in October (48.99 × 10⁴/g dry litter) and minimum in May (11.41 × 10⁴/g dry litter). Distribution of Deuteromyeetous fungi was more in comparison to Zygomycetes, oomyeetes and aseomyeetes. In the early stage of decomposition Mucor racemosus, Rhizopus nigricans, Chaetomium globosum and Gliocladium species were found primarly whereas at later stages of decomposition preponderance of Aspergillus candidus, Torula graminis, Cladosporiun dadosporioides and Aspergillus luchuensis was recorded.

Keywords::

• Climatic factors
• Decomposition
• Rice stubble