Short-term Nitrogen Mineralization Potential in Soils of Biofuel Cropping Systems
| Autor: | Teresita Chua-Ona, Yili Meng, Michael L. Thompson |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Crop residue
Perennial plant Chemistry Soil organic matter digestive oral and skin physiology fungi food and beverages Soil Science 04 agricultural and veterinary sciences Mineralization (soil science) 010501 environmental sciences engineering.material 01 natural sciences Agronomy 040103 agronomy & agriculture engineering 0401 agriculture forestry and fisheries Fertilizer Leaching (agriculture) Cover crop Nitrogen cycle 0105 earth and related environmental sciences |
| Zdroj: | Soil Science. 181:503-512 |
| ISSN: | 0038-075X |
| DOI: | 10.1097/ss.0000000000000187 |
| Popis: | Plant-available N in soil originates both from fertilizer N amendments and from mineralization of soil organic matter and crop residues. This study compared the N mineralization potential of soil in five biofuel cropping systems in Iowa (continuous corn [Zea mays], continuous corn with a winter rye [Secale cereale] cover crop, perennial prairie, N-fertilized perennial prairie, and corn-soybean [Glycine max] rotation). Net N mineralization potential was measured by a 4-week incubation and leaching method. To evaluate the impact of plant residues on mineralization, net N mineralization potential was measured with and without macroscopic in situ residues. To explore the effect of freezing and thawing on net N mineralization, some soil samples were frozen and thawed before incubation. Cropping systems had a significant effect (P < 0.05) on net N mineralization rate, in the following order: N-fertilized perennial prairie ≈ continuous corn with winter rye ≥ corn-soybean rotation ≥ continuous corn ≥ perennial prairie. The freezing and thawing treatment increased the 30-day net N mineralization rate approximately two-fold. The presence of plant residues alone did not affect the N mineralization rate, but N mineralization was significantly and positively correlated with the amount of plant residue N in the soil. |
| Databáze: | OpenAIRE |
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