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- Title
Soil soluble organic nitrogen in different horticultural production systems.
- Authors
Ge Ti-Da; Tang Dong-Mei; Song Shi-Wei; Huang Dan-Feng
- Abstract
By using ultra-centrifugal technique and KCl extraction, the contents of soil soluble organic nitrogen (SON), dissolved organic nitrogen (DON), and free amino acid (FAA) in three horticultural production systems, i.e., organic (OS), transitional (TS), and conventional (CS), were determined, and their correlations with some other soil properties were investigated. The results showed that SON content in the three production systems was in the order of OS>CS>TS, and the ratios of SON to soil total soluble N (TSN) and total N (TN) in OS, CS, and T S were 429%, 245%, and 184%, and 111%, 119%, and 74%, respectively. The DON content in OS, TS and CS was 438, 168 and 326 mg·kg-1, occupying 479%, 221% and 261% of TSN, and 29%, 23% and 36% of TN, respectively. FAA content occupied 1%(KG-*2)-(KG-*7)3% of TSN and 2%(KG-*2)-(KG-*7)10% of SON, and decreased in the order of CS>TS>OS. Correlation analysis showed that TSN, SON and FAA were significantly correlated with soil total N, total carbon, NO3--N and NH4+-N. Different management measures of horticultural production system changed the SON content and its characters. Keywords: Optical properties and remote sensing retrieval model of diffuse attenuation coefficient of Taihu Lake water body.
- Subjects
NITROGEN; ORGANIC compounds; AMINO acids; SOIL composition; SOIL testing; HORTICULTURE; REMOTE sensing; CARBON; STATISTICAL correlation
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2009, Vol 20, Issue 2, p331
- ISSN
1001-9332
- Publication type
Article