Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    We will mail you new results for this query: keywords==fertilizer injury
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Mestinnovaties 'voeren op maat' : marktverkenning vermindering van aangevoerd fosfor in varkensvoer
Kortstee, H.J.M. ; Bikker, A.M. - \ 2010
Wageningen : Wageningen UR (BO-12.02 infobladen 22) - 2
beschadigingen door meststoffen - innovaties - mest - mestbeleid - bemesting - mineralenboekhouding - fertilizer injury - innovations - manures - manure policy - fertilizer application - nutrient accounting system
Het huidige mestbeleid wil overmatig gebruik van meststoffen voorkomen, zodat de gewenste milieukwaliteit wordt bereikt. De mestmarkt speelt hierbij een grote rol. Voor de kortere termijn zijn oplossingen nodig om de druk op de mestmarkt te verlichten. Binnen het mestinnovatieprogramma ‘voeren op maat’ is de lijn uitgezet om de hoeveelheid aangevoerd fosfor via het veevoer te verminderen.
Kunstmestvervangers onderzocht
Hoeksma, P. ; Hoop, J. de; Vries, J.W. de; Velthof, G.L. ; Ehlert, P.A.I. ; Dijk, W. van; Middelkoop, J.C. van; Schröder, J.J. ; Verloop, J. - \ 2009
Lelystad : Animal Sciences Group (Informatieblad Mineralen en Milieukwaliteit 30) - 2
landbouw - milieu - effecten - installatie - beschadigingen door meststoffen - landbouw en milieu - agriculture - environment - effects - installation - fertilizer injury - agriculture and environment
Het in dit pamflet beschreven onderzoek worden de landbouwkundige en milieukundige effecten van het gebruik van de producten uit de installaties als meststof getest. Het onderzoek bestaat uit verschillende deelprojecten die kort benoemd worden
Decline of carpophores of mycorrhizal fungi in stands of Pinus sylvestris
Termorshuizen, A.J. - \ 1990
Agricultural University. Promotor(en): J.J. Barkman; J. Dekker. - S.l. : Termorshuizen - 127
bosbouw - bomen - bosschade - beschadigingen door meststoffen - atmosfeer - luchtverontreiniging - chemicaliën - mycorrhizae - nederland - beschadigingen - schade - pinus sylvestris - forestry - trees - forest damage - fertilizer injury - atmosphere - air pollution - chemicals - mycorrhizas - netherlands - injuries - damage
<p>The carpophores of mycorrhizal fungi have declined drastically during this century in the Netherlands and in other European countries. In contrast, saprophytic and pathogenic fungi did not show a significant change. In this thesis, the possible causes of the decline of mycorrhizal mycoflora have been examined. The hypothesis was put forward that the functioning of mycorrhiza was hampered, either through a decrease of tree vitality or by changes in soil chemistry, both resulting from air pollution. <em>Pinus sylvestris</em> was chosen as study object, because in the Netherlands (1) its vitality has decreased considerably, (2) mycorrhizal mycoflora of coniferous tree species decreased more strongly than that of deciduous species, (3) it is the only native conifer which possesses ectomycorrhizas and (4) plantations of <em>P. sylvestris</em> of the same age and on the same soil type can be found throughout the country.<p>In a pot experiment, mycorrhizas of <em>Paxillus involutus</em> appeared to be sensitive to SO <sub><font size="-1">2</font></sub> fumigation alone, or in combination with NH <sub><font size="-1">3</font></sub> pollution, in contrast to mycorrhizas of <em>Laccaria proxima</em> . Photosynthesis, measured on <em>P. involutus</em> -inoculated seedlings, was inhibited by SO <sub><font size="-1">2</font></sub> fumigation. However, effects on plant growth were negligible (Chapter 2).<p>Nitrate and ammonium salts in a pot experiment had a significant negative effect on the mycorrhizas ( <em>Paxillus involutus</em> and <em>Suillus bovinus</em> ), and a significant positive effect on plant growth. Ammonium treatments affected the seedlings more positively and the mycorrhizas more negatively than nitrate. The N content of seedling needles fertilized with ammonium was higher than those treated with nitrate. It was suggested that a high N uptake by the plant decreased the carbohydrate availability for the mycorrhizal fungi (Chapter 3).<p>Ammonium and nitrate fertilization at rates of 0, 30 and 60 kg N ha <sup><font size="-1">-1</font></SUP>yr <sup><font size="-1">-1</font></SUP>in two young stands of <em>P. sylvestris</em> during three years had a similar, significantly negative effect on the number and total dry weight of carpophores and on the number of fruiting species. However, the number of carpophores of <em>Laccaria proxima</em> increased due to the fertilization treatments in one stand. Mycorrhizal frequency and number of mycorrhizas were not affected (Chapter 4).<p>Field observations revealed that the mycorrhizal mycoflora of young stands of <em>P. sylvestris</em> included species which have become rare during this century in the Netherlands (Chapter 5). Especially in first rotation young stands on drift sands many of these species were found, several of them in large numbers. This seems to be related to the fact that first rotation stands have become rare in the Netherlands. There was a considerable difference in the mycorrhizal mycoflora of first rotation young stands compared to that of second rotation young stands and of old stands. However, a literature survey showed that the fungal species which appeared to occur specifically in the first rotation young stands were also common in humus-rich and mature stands in Poland, Finland and Russia. Possible explanations for this difference are discussed.<p>In 50 to 80-year-old stands of <em>P. sylvestris</em> , the number of mycorrhizal fruiting species as well as the number and total dry weight of their carpophores had highly negative correlations with the NH <sub><font size="-1">3</font></sub> deposition and ambient NO <sub><font size="-1">x</font></sub> concentration, and to a lesser extent with ambient SO <sub><font size="-1">2</font></sub> concentration (Chapter 6). The mycorrhizal mycoflora showed insignificant positive correlations with tree vitality, expressed as the needle occupation of the trees. The mycorrhizal mycoflora was very poor in most old plots.<p>Young stands had a much richer mycoflora than old stands. Over the three years of field observations, more species (factor 3) and more carpophores (factor 13) were found in the young plots.<p>The mycorrhizal mycoflora in 5 to 10-year-old stands was negatively influenced by infection of trees by <em>Lophodermium seditiosum.</em> High positive correlations were found with ambient NO <sub><font size="-1">x</font></sub> concentrations and could be partially ascribed to infection by <em>L.</em><em>seditiosum,</em> which occurred in the less polluted areas.<p>The mycorrhizal frequency exceeded 95% in all but one of the old plots and in all young plots, indicating that the decrease of carpophores preceedes that of mycorrhizas.<p>The following conclusions were drawn:<br/>(1) No decline of carpophores of mycorrhizal fungi could be detected in young stands of <em>P.</em><em>sylvestris,</em> this in contrast to the situation in old stands.<br/>(2) The carpophores of mycorrhizal fungi in young stands are negatively affected by (artificial) nitrogen fertilization. The mycorrhizas of seedlings can be negatively affected by nitrogen fertilization and by SO <sub><font size="-1">2</font></sub> fumigation.<br/>(3) The nitrogen effect on the mycorrhizas is likely to be a result of decreased supply of carbohydrates by the plant, caused by the increased uptake of nitrogen compounds.<br/>(4) The effects of nitrogen deposition and SO <sub><font size="-1">2</font></sub> pollution on <em>P.</em><em>sylvestris</em> and mycorrhiza depend on the fungal species involved.<br/>(5) The age of forest soils determines to a great extent the mycoflora. The ageing of Dutch forests contributes to the decrease of mycorrhizal mycoflora. It is not clear to what extent air pollution influences the succession of mycorrhizal fungi.<br/>(6) Nitrogen pollution is the major factor explaining the decrease of mycorrhizal mycoflora. The absence of effects of nitrogen pollution in young plots is explained by the high nitrogen losses due to clear-cutting and soil ploughing, decreased interception of air pollutants by smaller trees and the higher need for external nitrogen of young trees.<br/>(7) Carpophores of mycorrhizal fungi are more sensitive to nitrogen pollution than mycorrhizas.<br/>(8) It is proposed that the decline in mycorrhizal mycoflora during stand development might not occur if air pollution, particularly nitrogen pollution, is drastically diminished, and if the excess nitrogen in the ecosystem is removed.
De invloed van bemesting met kalk, gips, fosfaat en organische stof op de groei van enkele loof- en naaldhoutsoorten op een met zink verontreinigde grond : verslag van in 1975 en 1976 uitgevoerde potproeven
Burg, J. van den; Janssens, M.J.W.M. - \ 1977
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" no. 125) - 20
bosbouw - houtteelt - bosbouwkundige handelingen - groei - milieufactoren - bosschade - beschadigingen door meststoffen - beschadigingen - voedingsstoffentekorten - bodemgiftigheid - bosopstanden - bemesting - forestry - silviculture - forestry practices - growth - environmental factors - forest damage - fertilizer injury - injuries - nutrient deficiencies - soil toxicity - forest stands - fertilizer application
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