10136: Effects of Vertical distribution of soil inorganic nitrogen on root growth and subsequent nitrogen uptake by field vegetable crops [Jordens vertikale fordeling af uorganiske kvælstof påvirker rodvækst eller kvælstofoptagelse hos grønsager i markforsøg]
(2007) Effects of Vertical distribution of soil inorganic nitrogen on root growth and subsequent nitrogen uptake by field vegetable crops [Jordens vertikale fordeling af uorganiske kvælstof påvirker rodvækst eller kvælstofoptagelse hos grønsager i markforsøg]. Soil Use and Management(23):pp. 338-347.
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Summary
The nitrogen use efficiency in horticultural production may be increased by matching root distribution of crops with the availability of inorganic nitrogen (Ninorg) to deep soil depth. The purpose of this study was to investigate root growth of a variety of horticultural crops; and if differences in vertical distribution of soil Ninorg affected root growth and N uptake of the crops. Two field experiments were performed each over two years with shallow or deep placement of soil Ninorg obtained by management of cover crops. Vegetable crops of leek, potato, Chinese cabbage, beetroot, summer squash and white cabbage obtained root depths of 0.5, 0.7, 1.3, 1.9, 1.9 and more than 2.4 m at harvest; and showed rates of root depth penetration from 0.2 to 1.5 mm day oC-1. Shallow placement of soil Ninorg resulted in higher N uptake in the shallow rooted leek and potato, whereas root growth was unaffected. Deep placement of soil Ninorg resulted in higher rates of root depth penetration in three of the four deep rooted crops, which increased root depth at harvest by 0.2-0.4 m. The root intensity was decreased in shallow soil layers (white cabbage) and increased in deep soil layers (Chinese cabbage, summer squash and white cabbage). Still, the vertical soil Ninorg distribution had much less influence on root distribution and the ability for depletion of soil Ninorg than the choice of species.
| Document Language: | English |
|---|---|
| Keywords: | deep roots, horticulture, nitrate, root density, root frequency, soil nitrogen, subsoil, minirhizotrons, vegetables, white cabbage, Chinese cabbage, summer squash, beetroot, leek, potato, root depth, plant N uptake, green manure, catch crops, cover crops, |
| Subject Areas: | Soil > Nutrient turnover Crop husbandry > Crop combinations and interactions Crop husbandry > Production systems > Vegetables |
| Research affiliation: | Denmark > AU - Faculty of Agricultural Sciences Denmark > DARCOF II (2000-2005) > I.10 (VegCatch) Organic vegetable cultivation methods and use of catch crops |
| Funding Part: | 75-100% |
| Total budget (Euro): | 0 |
| Orgprints ID Number: | 10136 |
| Contact: | Kristensen, Ph.D. Hanne L. |
| Deposited On: | 09 October 2007 |
| EPrint Type: | Journal paper |
| Published?: | Published |
| Peer Review Status: | Peer-reviewed and accepted |
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