| Journal Article |
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| Article Title | Production and decay of structural root material of winter wheat and sugar beet in conventional and integrated cropping systems | | Author | Meine van Noordwijk, Gerard Brouwer, H Koning, Frits W Meijboom and W Grzebisz | | Year | 1994 | | Journal Title | Agriculture, Ecosystems and Environment | | Institution | Elsevier | | Volume | 51 | | Issue | 1-2 | | Pages | 99-113 | | Call Number | JA0070-04 | | Keywords | Decomposition, Farming system, Conventional, Integrated, Minirizhotron technique, Root turnover, Sugar beet, Triticum aestivum |
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| Abstract: |
| Production of structural root material of sugarbeet and winter wheat was quantified by analysis of root growth and decay in a time series of minirhizotron images, combined with a single auger sampling in the Netherlands. Cumulative root production of winter wheat was approx equal to 1700 kg/ha for conventional crop management and 1960 kg/ha for integrated (less pesticides and mineral fertilizer, less intensive soil tillage and more organic manure) crop management. At harvest time 85% and 68% (in 1986 and 1990, respectively) of structural root production remained as intact roots in the soil in both management systems. For sugarbeet total fine root production was estimated at 1150 kg/ha in 1987 and 1989, with a significantly lower amount on the field where minimum tillage was implemented in 1986; on average 47% of total root production remained as intact roots at harvest. Winter wheat root decay was studied with litter pots after harvest and in the following growing season. Initially, the N concentration in remaining roots increased while dry weight decreased. No net immobilization or mineralization of N and P during autumn was evident. During the next growing season net mineralization was proportional to loss of root weight in an exponential decay with a half-life of 600 degree days (daily temp. sum). No difference between the two management systems was found |
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