Use of blue-green algae and bryophyte biomass as a source of nitrogen for oil-seed rape |
| |
| Authors: | D L N Rao R G Burns |
| |
| Institution: | (1) Biological Laboratory, University of Kent, CT2 7NJ Canterbury, Kent, UK;(2) Present address: Central Soil Salinity Research Institute, 132001 Karnal, Haryana, India |
| |
| Abstract: | Summary Blue-green algal (Nostoc muscorum) or bryophyte (Barbula recurvirostra) growth on the surface of a brown earth silt loam contained in flooded columns significantly increased soil C (+20.9% and ±23.0%, respectively) and soil N (+25.1% and +9.6%, respectively) after 5 weeks in the surface 0.7-cm soil layer. Differences in the lower layers were not significant since there was no movement of C or N metabolites down the profile, even after 21 weeks. The input of C by the inoculated blue-green algae was estimated at 0.48 Mg C 100-1 g soil or 0.45g C ha-1; the bryophyte growth gave 0.5 Mg C ha-1. N fixation by the blue-green algae alone was estimated at 60 kg N ha-1 after 5 weeks of growth. Blue-green algae associated with bryophyte growth had fixed 23 kg N ha-1 after 5 weeks, rising to 40 kg ha-1 after 21 weeks. Decomposition of the bryophyte biomass led to a significant increase in the dry weight (+16.8%) and the N uptake (+27.5%) of spring oil-seed rape planted in homogenised soil. In contrast, soil incorporation of the blue-green algal biomass had no significant effect on yield. The equivalent mineralized N from the blue-green algal and bryophyte incorporation was estimated as 24 and 58 kg N ha-1, respectively. |
| |
| Keywords: | Blue-green algae N2 fixation Oil-seed rape Organic matter Productivity Wetland rice soil Nostoc muscorum |
| 本文献已被 SpringerLink 等数据库收录！ |
|
