Loading...
Please wait, while we are loading the content...
Similar Documents
An evaluation of factors influenced by nitrogen fixation in sainfoin (Onobrychis viciifolia Scop.)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hill, Nicholas S. |
| Copyright Year | 1980 |
| Abstract | Nitrogen fixation in the legume plant depends on the legume genotype, the Rhizdbium strain, the interaction of the legume plant and the Rhizdbium strain, and the interaction of microorganisms in the field with the legume plant and the Rhizobium inoculum. This study was conducted to I) evaluate the performance of single strains and composites of strains of Rhizobium on Remont sainfoin and identify indices of nitrogen fixation affected by Rhizobium strains; 2) determine if an inhibitory factor of nitrogen fixation exists in the soil; and 3) characterize sainfoin as to its nitrogen fixing potential. Seven commercial strains of Rhizobium specific for sainfoin, two cross inoculant strains, four strains from Russia, and one field selected strain of Rhizobium were used to inoculate greenhouse grown sainfoin plants and evaluated for indices of nitrogen fixation. The Rhizobium differed significantly for all indices of nitrogen fixation except mg root/plant and mean nodule weight. Milligrams nodule/plant and %N forage were indices most closely associated with acetylene reduction. Based on the indices of nitrogen fixation, the strains of Rhizobium were clearly separated into two groups: effective and noneffective. The four best strains were then tested individually and in all possible combinations. Based on acetylene reduction rates, the general effect of adding strains of Rhizobium to other strains of Rhizobium was additive. However, the degree of additivity was altered, presumably by toxins produced spontaneously by the Rhizobium. Two individual strains of Rhizobium, O. viciifolia 116A8 and O. viciifolia 116A27, expressed overall beneficial effects when averaged across all treatments. A strain combination of O. viciifolia 116A8 + O. viciifolia 116A14 + Petalostemum 124A1 was also beneficial. Strain combination O. viciifolia 116A27 + Petalostemum 124Z1 had a detrimental effect when averaged across all treatments. Based on indices of nitrogen fixation, soil microflora and soil nutrients had no effect on the performance of Rhizobium on greenhouse grown sainfoin with exception of mg dry forage/plant. Significant differences may have been detected for other indices of nitrogen fixation with increased replications. There was a significant positive correlation between fibrous rootedness and nodule number in greenhouse grown Melrose and Remont sainfoin. Both cultivars expressed normal distributions for root and nodule scores. This suggests that increased nitrogen fixation in sainfoin can be obtained by selecting for increased root fibrosity. When screened for nitrogen fixation, five replicates in time of Remont sainfoin did not express normal distributions for acetylene reduction rates. Rates were' skewed to the lower reduction rates. STATEMENT OF PERMISSION TO COPY In presenting this thesis in partial fulfillment of the require ments for an advanced degree at Montana State University, I agree that the Library shall make it freely available for inspection. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by my major professor, or, in his absence, by the Director of Libraries. It is understood that any copying or publication of this thesis for financial gain shall not be allowed without my written permission. |
| Starting Page | 1 |
| Ending Page | 92 |
| Page Count | 92 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://scholarworks.montana.edu/xmlui/bitstream/handle/1/5378/31762100143237.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
