Journal article
Integrated Management of Inorganic and Organic Nitrogen and Efficiency in Potato Systems
Soil Science Society of America journal, Vol.71(5), pp.1508-1515
09/2007
Abstract
A potato (Solanum tuberosum L.) experiment from 2002 to 2004 examined fallow or winter rye (Secale cereale L.) (average residues ∼1 Mg ha−1) cover crop systems with a split‐plot design of 0 or 5.6 Mg ha−1 poultry manure. A 75‐L container experiment used field trial soil to evaluate N dynamics in the presence and absence of N fertilizer. Organic N source (manure, cover crop residues, or both) availability was used to adjust fertilizer rate downward to provide an estimated 224 kg N ha−1 for all treatments. Plant growth, N uptake, and tuber yield were monitored, along with soil organic N status and light‐fraction organic matter. In the field, the integrated treatment (179 kg N ha−1 fertilizer + manure) consistently increased tuber yield and N uptake efficiency by 20% compared with the unamended conventional management (224 kg N ha−1 fertilizer). Similarly, tuber yield and N uptake in the integrated treatments of the container experiment were 14 to 33% higher than the fertilized, unamended treatment. In the absence of fertilizer, rye cover crop and manure enhanced tuber yield 40 to 210% compared with unamended plants. The release of N from diverse sources was in apparent synchrony with plant demand, as indicated by monitoring of NO3–N dynamics and the presence of light‐fraction N. Although manure application was associated with higher N input, subsoil NO3–N in manured and unmanured treatments averaged 6.7 and 7.9 mg kg−1, respectively. High productivity and N efficiency were associated with integrating organic and inorganic N sources, which represents an environmentally and agronomically sound management strategy.
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Details
- Title
- Integrated Management of Inorganic and Organic Nitrogen and Efficiency in Potato Systems
- Creators
- Judith Nyiraneza - Michigan State UniversitySieglinde Snapp - Michigan State University
- Publication Details
- Soil Science Society of America journal, Vol.71(5), pp.1508-1515
- Publisher
- Soil Science Society
- Number of pages
- 8
- Grant note
- Partnership for Enhancing Agriculture
- Identifiers
- 99901397985401842
- Language
- English
- Resource Type
- Journal article