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| Registros recuperados: 112 | |
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| Thorup-Kristensen, Kristian. |
| Results from an organic vegetable rotation, and from a number of specific experiments with catch crops, shows that autumn crop cover strongly improves N availability for the succeeding crop. Though many different types of crop cover have been involved, from full year green manures, to short term catch crops and green manures and even white cabbage stubble allowed to continue growth after harvest, they have all had a similar effect on N dynamics in the field. With crops actively growing in the field until the late autumn, much less N is left in the soil, and the risk of leaching loss is strongly reduced. In the subsequent spring, mineralization of N from the crop residues leads to increased N availability for the succeeding crop. This main effect was found... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds Production systems Vegetables. |
| Ano: 2004 |
URL: http://orgprints.org/3875/1/3875.doc |
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| Thorup-Kristensen, Kristian; Brennan, Mary; Halberg, Niels; Cooper, Julia; Lampkin, Nic; Niggli, Urs. |
| QLIF researchers have collected data on the environmental and economic impact of a series of production measures. This will be the basis for this workshop which aims to analyse the efficiency of organic and low-input systems concerning the use of land, nutrients, water energy, and climate change scenarios. Economic efficiency of different production systems with implication for markets and prices will be analysed. Furthermore, we will explore to which extend consumers value environmental benefits. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2008 |
URL: http://orgprints.org/13352/1/qlif%2Dworkshop5%2D4p%2Dthorup%2Dkristensen[1].doc |
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| Nielsen, Kai Lønne; Thorup-Kristensen, Kristian. |
| The choice of growing media and the strategy of application of organic fertilizers is considered one of the largest challenges for production of organic tomato plantlets for transplanting. We have measured the growth and the ability of young tomato plantlets to extract plant nutrients from an organic growing media. Plants were grown in 0.45L pots. Plant nutrition were either entirely based on the mineral nutrients, available from the organic growing media or based on a combination of nutrients from the organic growing media and fertigation with water-soluble organic fertilizers during plantlet production. The first results shows that plant dry weigth and uptake of nitrogen, phosphorus and potassium was reduced in the organic growing media compared to the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Breeding; Genetics and propagation Vegetables Composting and manuring. |
| Ano: 2001 |
URL: http://orgprints.org/1606/1/KTK06009.pdf |
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| Thorup-Kristensen, Kristian. |
| Vegetable cropping systems are prone to high nitrogen (N) leaching losses. Optimizing the management of each crop can reduce this problem, but not solve it. Important improvements in cropping system N efficiency can be obtained by improving the rotation, to make sure that N left by some crops are to a large extent used by the succeeding crops. However, this includes rotation and fertilization planning based on a complex set of information on many crop species, on catch crops and green manure crops and on their interaction with soil and weather conditions. Simulation models can be used in various ways to give specific advice for growers on fertilization. Models can also be used to help growers develop their growing systems by helping them to get a better... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Vegetables; Farm nutrient management; Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/16318/1/16318.pdf |
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| Stavridou, Eleftheria; Broadley, Martin R.; Thorup-Kristensen, Kristian; Young, Scott D.. |
| Selenium (Se) is an essential nutrient for animals, humans and microorganisms. The importance of Se in the prevention, as well as the treatment, of chronic and degenerative diseases in humans has been established. Catch crops have been used successfully in agriculture to improve soil fertility, increase nitrogen and sulfur content in the soil and avoid nutrient leaching. The intention of the present study was to estimate the net Se mineralization rate from plant material, relative to inorganic salts, and to evaluate the risk of Se leaching after their application. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farm nutrient management. |
| Ano: 2009 |
URL: http://orgprints.org/19591/1/NetMineralizationRateOfSeleniumProceeding_ELST.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. These data were used for calculation of the potential rate of nitrate uptake below 1 m depth. The rate was found to be significant for the six crops studied. The effect of root depth on soil N left by an annual crop was simulated with the EU-rotate N model. The results showed that deep rooted crops... |
| Tipo: Book chapter |
Palavras-chave: Nutrient turnover; Crop combinations and interactions; Vegetables. |
| Ano: 2008 |
URL: http://orgprints.org/11459/1/11459.pdf |
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| Sørensen, Jørn Nygaard; Thorup-Kristensen, Kristian. |
| The objective of this experiment was to investigate the potential of several species of undersown legume crops to deplete soil nitrate and to accumulate nitrogen. A further objective was to measure the effects of the legume crops as a green manure for a succeeding early lettuce crop. In two years, different undersown legume crops were compared to a control treatment where no crop was undersown. In November, at the end of their growing season, the legume crops reduced the content of mineral nitrogen in the top 1 m of the soil to one third of what was available when no crop was undersown. The N uptake in shoots and roots was in the range of 100-160 kg ha-1. The legume crops were incorporated at the beginning of April the succeeding year. In May, the content... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2003 |
URL: http://orgprints.org/1204/2/Biological_Agriculture_and_Horticulture_2003.doc |
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| Pedersen, Anders; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann. |
| A model analysis of catch crop effects on nitrate leaching was carried out covering three soil types and three precipitation regimes in temperate climate. Catch crops with varying root properties (barssica and rye grass) were used to analyse the effect on nitrate retention in different soil layers. Climate data was taken from 3 different precipitation regimes over 43 years with an average annual amount of rainfall of 709, 796 and 1026 mm. The three soil types were typical Danish sandy soil, a loamy sand soil and a sandy loam. These soil types cover 65 % of the Danish arable area. Simulations covered a winter season from harvest to 1 May the following year. To illustrate the effect of rooting depth of the succeeding crop soil mineral N content is calculated... |
| Tipo: Journal paper |
Palavras-chave: Farm nutrient management; Denmark. |
| Ano: 2009 |
URL: http://orgprints.org/9341/2/9341.pdf |
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| Thorup-Kristensen, Kristian. |
| Når efterafgrøder etableres ved undersåning i korn, er det i praksis stort set altid rajgræs der anvendes. Men forsøg med forskellige efterafgrøder har vist at der kan være store fordele ved at vælge andre arter, både i miljøeffekt, i eftervirkning og i andre forhold. Vi har derfor undersøgt en række plantearter udsået som undersåede efterafgrøder i vårbyg. Flere af arterne har vist lovende egenskaber, der er bl.a. identificeret arter med markant dybere rodvækst end vi opnår med rajgræs. Farvevajd, som er en lille korsblomstret plante har vist sig velegnet til undersåning. Den er meget lovende, da den kombinerer en meget dyb rodvækst med lavt C/N forhold i biomassen og dermed en bedre eftervirkning end de fleste andre efterafgrøder. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Production systems. |
| Ano: 2004 |
URL: http://orgprints.org/3885/1/3885a.rtf |
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| Registros recuperados: 112 | |
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