Poster (Scientific congresses and symposiums)
Which P inputs are compatible with a sustainable agriculture at short and long-term?
Renneson, Malorie; Dufey, Joseph; Roisin, Christian et al.
2014Phosphorus in Soils and Plants - 5th International Symposium
 

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Keywords :
phosphorus; fertility; soil
Abstract :
[en] During the past 20 years, there has been a constant reduction in mineral fertilizer use due to price increases and environmental concerns. These changes can lead to a decrease in soil P content, which is already observed in some regions in Wallonia. Some new issues are now emerging. Is current cropping systems compatible with yield maintenance? Do organic fertilizers have a similar effect than mineral fertilizers? To answer to these questions, a short-term experiment in controlled conditions and 2 long-term experimental plots were studied. The short-term experiment permitted to study the kinetics of P after an input and differences between fertilizer types, whereas the long-term experiments studied 3 levels of P and K input and different organic compounds. Although an evolution of P content was observed, no difference of yield was found before about 20 years. However, after 47 years, available P levels were considered as low in zero P-input plots and attention must now be focused on these parcels. Zero P-input caused a mean yield decrease of 7%, while a double input increased yield by 2% in comparison to plots with input corresponding to crop export. Thus the zero P-input option is rarely economically profitable in the long-term and providing double the amount of P removed is never financially sustainable. Finally, no difference of P content was observed between organic and mineral fertilizers, except for manure which engendered a higher P content. In conclusion, organic and inorganic fertilizers had a relatively similar effect and overlooking P fertilizer is possible in the short-term but P content has to be followed at the long-term, although yield loss was limited.
Disciplines :
Agriculture & agronomy
Earth sciences & physical geography
Author, co-author :
Renneson, Malorie ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Dufey, Joseph
Roisin, Christian;  Centre wallon de Recherches Agronomiques
Colinet, Gilles  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Language :
English
Title :
Which P inputs are compatible with a sustainable agriculture at short and long-term?
Publication date :
August 2014
Event name :
Phosphorus in Soils and Plants - 5th International Symposium
Event place :
Montpellier, France
Event date :
du 26 août 2014 au 29 août 2014
Audience :
International
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
Available on ORBi :
since 17 December 2014

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