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- Title
Characteristics of N forms and N-transforming bacteria in paddy soil under different tillage patterns.
- Authors
Gu Ming-hua; Ou Hui-ping; Liu Xi-hui; Huang Jing; Li Xiao-feng; Li Liu-xia; Shen Fang-ke; Jiang Li-geng
- Abstract
Paddy soil samples were collected in layers (0-5, 5- 12, and 12-20 cm) during rice growth period to investigate the characteristics of the N forms and N-transforming bacteria in the soil profile under different tillage patterns (no-tillage with straw returning, NT S; conventional tillage with straw returning, CTS; no-tillage, NT; and conventional tillage, CT). In the whole rice growth period, ammonifying bacteria in 0-5 cm soil layer had the highest number under NTS, and nitrosobacteria in 0-5 cm and 5-12 cm soil layers were more abundant but in 12-20 cm soil layer were lesser under CT than under NT. Nitrosobacteria and denitrobacteria in 0-20 cm soil layer were lesser under NTS than under CTS. At elongating and ripening stages, anaerobic N-fixing bacteria in 0-5 cm soil layer were more abundant under NT than under CT. In the whole rice growth period, the alkali -hydrolyzable N and total N contents in 0-5 cm soil layer wer e significantly higher but in 5-12 cm and 12-cm soil layers were lower under NT than under CT, and the NH4+-N and N O3--N contents in 0-20 cm soil layer were higher under NT S but in 12-20 cm soil layer had no significant differences between NT and CT. Correlation analysis and multiple polynomial regression analysis further revealed that there were significant relationships between soil NH4+-N and soil ammonifying bacteria, nitrosobacteria and denitrobacteria, and between soil alkali-hydrolyzable N and soil anaerobic N-fixing bacteria. Among the test tillage patterns, NTS could be the more desirable one for the N supply and fertility maintenance of paddy soil.
- Subjects
SOIL profiles; CROP growth; RICE; PLANTING; TILLAGE; NO-tillage; NITROGEN in soils; NITROGEN; CROPS; NITROGEN-fixing plants; AGRICULTURE
- Publication
Yingyong Shengtai Xuebao, 2009, Vol 20, Issue 6, p1362
- ISSN
1001-9332
- Publication type
Article