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Influence of Long-term Tillage, Straw, and N Fertilizer Management on Crop Yield, N Uptake, and N Balance Sheet in Two Contrasting Soil Types.
- Source :
- Communications in Soil Science & Plant Analysis; 2011, Vol. 42 Issue 20, p2548-2560, 13p
- Publication Year :
- 2011
-
Abstract
- Field experiments (established in autumn 1979, with monoculture barley from 1980 to 1990 and barley/wheat–canola–triticale–pea rotation from 1991 to 2008) were conducted on two contrasting soil types (Gray Luvisol [Typic Haplocryalf] loam soil at Breton; Black Chernozem [Albic Agricryoll] silty clay loam soil at Ellerslie) in north-central Alberta, Canada, to determine the influence of tillage (zero tillage and conventional tillage), straw management (straw removed [SRem] and straw retained [SRet]), and N fertilizer rate (0, 50 and 100 kg N ha−1in SRet, and only 0 kg N ha−1in SRem plots) on seed yield, straw yield, total N uptake in seed + straw (1991–2008), and N balance sheet (1980–2008). The N fertilizer urea was midrow-banded under both tillage systems in the 1991 to 2008 period. There was a considerable increase in seed yield, straw yield, and total N uptake in seed + straw with increasing N rate up to 100 kg N ha−1 under both tillage systems. On the average, conventional tillage produced greater seed yield (by 279 kg ha−1), straw yield (by 252 kg ha−1), and total N uptake in seed + straw (by 6.0 kg N ha−1) than zero tillage, but the differences were greater at Breton than Ellerslie. Compared to straw removal treatment, seed yield, straw yield, and total N uptake in seed + straw tended to be greater with straw retained at the zero-N rate used in the study. The amounts of applied N unaccounted for over the 1980 to 2008 period ranged from 1114 to 1846 kg N ha−1 at Breton and 845 to 1665 kg N ha−1 at Ellerslie, suggesting a great potential for N loss from the soil-plant system through denitrification, and N immobilization from the soil mineral N pool. In conclusion, crop yield and N uptake were lower under zero tillage than conventional, and long-term retention of straw suggests some gradual improvement in soil productivity. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 00103624
- Volume :
- 42
- Issue :
- 20
- Database :
- Complementary Index
- Journal :
- Communications in Soil Science & Plant Analysis
- Publication Type :
- Academic Journal
- Accession number :
- 66825183
- Full Text :
- https://doi.org/10.1080/00103624.2011.609262