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| Cuijpers, W.J.M.; Smeding, F.; Amsing, J.; Postma, J.; Koopmans, C.J.. |
| Four months after application of sheet steaming to the soil in an organic greenhouse, the treatment had still a significant effect on the diversity of the soil microflora (bacterial and fungal populations). Also four months after steaming, two fertilizer types differed significantly in their effect on microbial composition. Goat manure had a positive effect on bacterial diversity, while spent mushroom compost had a stimulating effect on fungal diversity. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2005 |
URL: http://orgprints.org/4218/3/Cuijpers_etal_effect_4p_revised%2Ded.doc |
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| Zanen, M.; Bokhorst, J.G.; Koopmans, C.J.. |
| After a completed rotation of seven years, soils of the Manure as a Chance (MAC) trial were analysed for the effect of organic amendments on soil physical, chemical and biological properties. Yields suggest significant differences due to different organic amendments after seven years. In treatments receiving farm yard manure and bio waste compost yields increased over time. Soil properties indicate changes in soil carbon, nitrogen mineralization en plant feeding nematodes due to different organic amendments. No significant changes in microbial and fungal biomass were found. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil; Soil biology; Soil quality. |
| Ano: 2008 |
URL: http://orgprints.org/11622/1/Zanen_11622_ed.doc |
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| Cuijpers, W.J.M.; Voogt, W.; Koopmans, C.J.. |
| An on-farm field trial was set up in an organic greenhouse in order to balance the N-uptake by a sweet pepper crop and the mineralization of the organic fertilizers was applied. The effects of six fertilizer treatments were compared regarding yield, nutrient availability and mineral balance. Application of high levels of compost turned out to be favourable in order to reduce surplusses of available-N on the short term. On the long term, such high levels of compost are unfavourable as a high pool of mineralizable-N in the soil organic matter restricts the possiblities for precise fertilization adapted to plant uptake. Application of lower levels of farm yard manure in combination with additional fertilization with feathermeal turned out to be a good... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Fruit and berries. |
| Ano: 2005 |
URL: http://orgprints.org/4331/4/4331%2DCuijpers_etal_balancing_4p_revised%2Ded.pdf |
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| Koopmans, C.J.; Zanen, M.. |
| Understanding organic management practices is a key in developing sustainable organic farming systems. We report the results of four different organic fertilization strategies in a field trial on yields, soil quality and economic performance. We found highest yields and economic performance in two direct plant feeding strategies. One of these strategies, a newly developed strategy based on biowaste compost (GFT) and an additional fertilizer performed well in terms of yields but looks also very promising in terms of soil quality and biodiversity. The economic perspective of this strategy renders it promising in regions with little animal manures. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2007 |
URL: http://orgprints.org/9726/1/koopmans%2Dzanen%2D2007%2Dsoil%2Dmanagement.pdf |
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| Koopmans, C.J.; Zanen, M.; Bokhorst, J. G.. |
| After 8 years, the MAC field trial in Lelystad, the Netherlands, shows the effects of different fertiliser strategies, ranging from animal manure to plant compost to mineral fertiliser. The impact on yield, soil quality, soil health, environment and climate change is discussed. The trial is unique in monitoring th eeffect of so many types of fertilisers over so many years. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2008 |
URL: http://orgprints.org/14979/1/2086.pdf |
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