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| Registros recuperados: 112 | |
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| Kristensen, Hanne L.; Thorup-Kristensen, Kristian. |
| Leaching of NO3− from vegetable cropping systems can be very high compared to arable systems. This is a problem for vegetable growers in general as it decreases groundwater quality, and for organic growers in particular as the organic production is often limited by N. In a field experiment, we investigated the N uptake and root growth of three vegetables using minirhizotrons reaching 2.4 m with the purpose to study the relationship between vegetable root distribution and uptake of NO3− from deep soil layers. NO3− uptake was studied over a 6 d period at the end of September by injection of 15 NO3− at four depths in the ranges: 0.2–0.8, 0.6–1.8, and 1–2.5 m under late sweet corn (Zea mays L. convar. Saccharata Koern.), carrot (Daucus carota L.), and autumn... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Soil; Vegetables; Environmental aspects. |
| Ano: 2004 |
URL: http://orgprints.org/32023/1/Plant%20and%20Soil%202004.pdf |
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| Pedersen, Anders; Stoumann Jensen, Lars; Thorup-Kristensen, Kristian. |
| The use of crops and catch crops with deep rooting can strongly improve the possibility of retaining nitrate-N that will otherwise be leached to the deeper soil layers and end up in the surrounding environment. But will it always be an advantage for the farmer to grow a catch crop? This will depend on factors such as soil mineral nitrogen level, soil water holding capacity, winter precipitation, rooting depth and N demand of the scceeding crop. These factors interact, and it can be very difficult for farmers or advisors to use this information to decide whether growing a catch crop will be beneficial. To analyse the effect of catch crops under different Danish soil and precipitation conditions, we used the soil, plant and atmosphere model Daisy. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Post harvest management and techniques; Crop combinations and interactions; Farm nutrient management; Soil quality. |
| Ano: 2005 |
URL: http://orgprints.org/7831/1/7831.pdf |
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| Kristensen, Hanne L.; Thorup-Kristensen, Kristian. |
| The root depths of annual crops vary from 0.2 m to more than 2 m depending on root growth rate and length of growing season. However, studies of root growth and N uptake are often restricted to a depth of 1 m or less, as root biomass is assumed to be negligible below this depth. We have studied the importance of root growth and N uptake to a depth of 2.5 m in fully grown field vegetables and cover crops by use of minirhizotrons and deep point placement of 15N. Deep rooted crucifereous crops were found to have high root densities to a depth of 1.5-2 m and high 15N uptake to this depth. Uptake was significant near the bottom of the root zone at a depth of 2-2.5 m where root density was low. Here N uptake rates were higher per unit root length compared to... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Crop combinations and interactions; Vegetables. |
| Ano: 2006 |
URL: http://orgprints.org/11462/1/Deep_roots_HLK_FINAL.ppt |
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| Pedersen, Anders; Thorup-Kristensen, Kristian. |
| Plant soil and atmosphere models are commonly used to predict crop yield and environmental consequence. Such models often include complex modelling modules for water movement, soil organic matter turnover and, above ground plant growth. However, the root modelling in these models are often very simple, partly due to a limited access to experimental data. We present a two-dimensional model for root growth and proliferation. The model focuses on annual crops, and attempt to model root growth of the crops and its significance for N uptake from different parts of the soil volume. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Production systems; Vegetables; Root crops. |
| Ano: 2004 |
URL: http://orgprints.org/4634/1/4634.pdf |
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| Thybo, Anette K.; Edelenbos, Merete; Christensen, Lars P.; Sørensen, Jørn Nygaard; Thorup-Kristensen, Kristian. |
| Tomato plants were grown in open beds, confined beds, or combined beds with compost based on clover grass hay, deep litter and peat. Due to only minor effects of growing systems on sensory quality and chemical composition of tomato fruits is was concluded that it is possible to produce tomato fruits in confined and combined soil bed systems without any loss in eating quality. Actually the results indicate, that a slight increase in quality of tomatoes from the confined and combined systems is obtained. The present result points to the fact that confined and combined growing systems may be new relevant commercial growing systems, in which the quality of tomatoes seems to be ensured, and in which nutrient loss and root diseases contamination can be reduced. |
| Tipo: Journal paper |
Palavras-chave: Vegetables. |
| Ano: 2006 |
URL: http://orgprints.org/4657/1/Tomato_growing_systems.pdf |
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| Han, Eusun; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian. |
| Introduction: Deep roots have the potential to exploit plant resources otherwise inaccessible. The aim of this study was to develop a method, the Core-Labelling Technique (CLT), to measure root activity down to 2.5 m of soil depth under field conditions. Materials and Methods: Two stainless steel ingrowth-cores, 0.1 m in diameter and 0.55 m in length, were filled with soil labelled with nutrient tracers, i.e., LiCO3, CsCO3, Na2SeO4, RbCO3 and 15NH4Cl. The labelled cores were placed into an access-tube having openings at 1.0 m and 2.5 m of soil depth. They were kept under a lucerne (Medicago sativa) crop for 60 days, after which, the root length density (RLD) and concentration of tracers in shoot biomass (including a control) were measured. Results:... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil biology; Nutrient turnover; Soil tillage; Farm nutrient management. |
| Ano: 2018 |
URL: http://orgprints.org/33942/1/Poster%20-%20Eusun_final.pdf |
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| Registros recuperados: 112 | |
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