Legume species have been known to increase soil N content and are
incorporated into land restoration seed mixes in hopes of improving degraded soils and
plant communities. The goals of this project were to determine effects of soil type, soil
moisture, inocula and fungicide treatments on legume establishment, N2 fixation
capacity and plant biomass for six individual native legume species. In potted
greenhouse studies, legumes were grown in five field soils to verify nodulation without
inocula. In a second phase, plant biomass was measured in two soils at two moisture
contents (60 and 80% of field capacity). The efficacies of Rhizobia inocula and
fungicide treatments were also tested. The greenhouse studies were used to supplement
data gathered at three field sites around Montana. Native soils contained Rhizobia that
were specific to many of the plant species tested and induced nodulation. Soil
moisture content, inoculation and fungicide treatments had less effect on nodulation
and biomass than the soil characteristics. Fungicide treatments benefited establishment
of Lupinus argenteus, and had mixed effects on Astragalus canadensis and Dalea
candida. Benefits were dependent on soil nutrient content, microbial biota and other
characteristics. Shoot biomass at each field site also varied significantly; in general A.
canadensis had the highest nodulation and biomass, while Dalea purpurea and D.
candida typically had the lowest biomasses and nodulation. This research should assist
land managers in selecting species to suit a wide variety of ecological conditions and
land restoration scenarios.
Legume species have been known to increase soil N content and are
incorporated into land restoration seed mixes in hopes of improving degraded soils and
plant communities. The goals of this project were to determine effects of soil type, soil
moisture, inocula and fungicide treatments on legume establishment, N2 fixation
capacity and plant biomass for six individual native legume species. In potted
greenhouse studies, legumes were grown in five field soils to verify nodulation without
inocula. In a second phase, plant biomass was measured in two soils at two moisture
contents (60 and 80% of field capacity). The efficacies of Rhizobia inocula and
fungicide treatments were also tested. The greenhouse studies were used to supplement
data gathered at three field sites around Montana. Native soils contained Rhizobia that
were specific to many of the plant species tested and induced nodulation. Soil
moisture content, inoculation and fungicide treatments had less effect on nodulation
and biomass than the soil characteristics. Fungicide treatments benefited establishment
of Lupinus argenteus, and had mixed effects on Astragalus canadensis and Dalea
candida. Benefits were dependent on soil nutrient content, microbial biota and other
characteristics. Shoot biomass at each field site also varied significantly; in general A.
canadensis had the highest nodulation and biomass, while Dalea purpurea and D.
candida typically had the lowest biomasses and nodulation. This research should assist
land managers in selecting species to suit a wide variety of ecological conditions and
land restoration scenarios.
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