Cover crops and cover crop residues regulate rates of soil microbial decomposition and plant available nitrogen / by Nzube Prisca Egboluche.
Changes in soil microbial community and activities can influence the nutrient cycling and its availability to plants. I conducted a one-year soil incubation study to: evaluate the effects of short- and long-term N additions on the soil microbial activities and how cover crop residue mixtures influen...
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| Language: | English |
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2020.
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| Dissertation Note: |
Thesis M.S. Michigan State University. Crop and Soil Sciences 2020. |
| Physical Description: | 1 online resource (xiii, 99 pages, 7 unnumbered pages) : illustrations (some color) |
| Format: | Thesis Electronic eBook |
MARC
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| 100 | 1 | |a Egboluche, Nzube Prisca, |e author. | |
| 245 | 1 | 0 | |a Cover crops and cover crop residues regulate rates of soil microbial decomposition and plant available nitrogen / |c by Nzube Prisca Egboluche. |
| 260 | |c 2020. | ||
| 300 | |a 1 online resource (xiii, 99 pages, 7 unnumbered pages) : |b illustrations (some color) | ||
| 336 | |a text |b txt |2 rdacontent | ||
| 337 | |a computer |b c |2 rdamedia | ||
| 338 | |a online resource |b cr |2 rdacarrier | ||
| 500 | |a Electronic resource. | ||
| 502 | |g Thesis |b M.S. |c Michigan State University. Crop and Soil Sciences |d 2020. | ||
| 504 | |a Includes bibliographical references. | ||
| 520 | |a Changes in soil microbial community and activities can influence the nutrient cycling and its availability to plants. I conducted a one-year soil incubation study to: evaluate the effects of short- and long-term N additions on the soil microbial activities and how cover crop residue mixtures influence ecosystem functions. Two legume residues, Vicia villosa - hairy vetch (V) and Pisum sativum - field pea (P) with C:N ratio 12.8 and 10.5 respectively and two non-legume residues, Pennisetum glaucum - pearl millet (M) and Lolium multiflorum - rye grass (R) with C:N ratio 37.8 and 14.3 respectively were used in this study. Soils amended with V and R had greater inorganic N compared to M and P residues while in soils with residue mixtures I observed non-additive synergistic (NAS) effect on inorganic N at the initial and final stage of the incubation period. Long-term N addition increased inorganic N but was apparent with short-term N fertilizer. Addition of both short- and long-term N increased [beta]-1,4,-glucosidase (BG), [beta]-D-1,4-cellobiohydrolase (CBH), phenol oxidase (PO), peroxidase (PER) and acid phosphatase (PHOS) with the exception of Leucine-aminopeptidase (LAP) and urease enzyme activities. There was non-additive antagonistic (NAA) effects on cellulase, total oxidase, [beta]-1,4,-N-acetyl glucosaminidase (NAG) and NAS effects on LAP, urease and PHOS enzyme activities. The addition of residues likely stimulated microbial growth, but the NAA effect of residue mixtures on C acquisition enzyme (cellulase and total oxidase) activities suggests development of C limitation. | ||
| 588 | |a Description based on online resource; title from PDF title page (ProQuest, viewed July 23, 2020) | ||
| 650 | 0 | |a Soil microbial ecology |z Michigan. | |
| 650 | 0 | |a Soils |x Nitrogen content |z Michigan. | |
| 650 | 0 | |a Crops and nitrogen |z Michigan. | |
| 650 | 0 | |a Cover crops |z Michigan. | |
| 655 | 0 | |a Electronic dissertations. | |
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