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Evaluering af overvintrende grønsager i økologisk jordbrug

Lynge, Mariane (2019) Evaluering af overvintrende grønsager i økologisk jordbrug. Masters thesis, Aarhus University , Dept. Food Science. Master thesis Aarhus University. Aarhus University, Aarhus University.

[thumbnail of Mariane Lynge_732277_434513_Hand-in_Mariane.-Speciale.pdf] PDF - Danish/Dansk
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Summary

Abstract
A rising demand for organic and local commodities is occurring. Meanwhile the production of vegetables is attached with great risk of nitrate leaching, since the nitrogen use efficiency is low. A field experiment in 2017-2018 was conducted to clarify whether overwintering vegetables 1) can be implemented in organic vegetable cropping systems and 2) are able to reduce nitrogen levels in the soil equally with winter rye (Secale cereale). The project is a screening experiment without repetitions and the results must be interpreted as tendencies rather than significant differences. Five different vegetables are analyzed, with one to three different cultivars, one to two sowing or planting dates and one to two sowing densities. It was found that spinach (Spinacia oleracea), garlic (Allium sativum) and onion (Allium cepa) survived winter only depending on species. Pointed cabbage (Brassica oleracea var. capitata), carrot (Daucus carota var. sativus) and turnip (Brassica rapa var. rapa) did not survive. Despite indications of high frost tolerance from a rising chlorophyll content of the pointed cabbage winterkill occurred. Furthermore, it was found that sowing spinach and winter rye October 18 and 1 respectively, increased yields and decreased nitrogen levels in the soil in April when comparing to sowing November 7 and 1. The overwintering vegetables resulted in higher levels of nitrogen in the soil in April than the winter rye. It is estimated that the overwintering vegetables did not lower nitrate leaching due to high levels of nitrogen in deep soil layers at establishment, shallow roots and late establishment.


EPrint Type:Thesis
Subjects: Crop husbandry > Crop combinations and interactions
Environmental aspects > Air and water emissions
Crop husbandry > Production systems > Vegetables
Crop husbandry > Breeding, genetics and propagation
Research affiliation: Denmark > Organic RDD 3 > DoubleCrop
Denmark > AU - Aarhus University > Faculty of Science and Technology > Department of Food Science
Denmark > GUDP
Deposited By: Kristensen, Ph.D. Hanne Lakkenborg
ID Code:38411
Deposited On:28 Sep 2020 10:06
Last Modified:28 Sep 2020 10:06
Document Language:Danish/Dansk
Status:Published
Refereed:Not peer-reviewed

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