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Impacts à long terme d'une fertilisation minérale contrastée sur la dynamique du phosphore et du potassium dans un sol limoneux cultivé
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bruwier, Clémence |
| Copyright Year | 2019 |
| Abstract | Today, a more rational and efficient use of mineral fertilizers is necessitated due to the world's population increase, the fertilizer price rise, the impact of fertilizers on the environment and their probable depletion in a number of years. A long-term understanding of the processes involving nutrients (N, P and K) in soils is needed in order to achieve an efficient use. In this work, a long-term fertilization trial, set up at Gembloux in 1896, is studied. This trial is characterized by 5 different plots representing 5 different fertilization conditions: nitrogen, phosphate and potassium fertilization (NPK), phosphate and potassium fertilization (PK), nitrogen and potassium fertilization (NK), nitrogen and phosphate fertilization (NP) and no fertilization (O). The trial has continued for more than 100 years. In this context, the objective of this work is to quantitatively evaluate the impact of these contrasting processes on the dynamics of phosphorus (P) and potassium (K) in soils. To meet this objective, the general soil properties of the plots studied, the different forms of soil phosphorus and the different forms of soil potassium were quantified for each plot. The values obtained were compared with the values from the previous studies (1961 and 1981). For the vegetation, the amounts of nitrogen, phosphorus and potassium in the biomass and grain yields of each plot were determined. The results showed a significant influence of contrasting mineral fertilization on P and K content in the soil. The results obtained showed that in the absence of P and K input, the pools, which were initially not available for the plants have resupplied the pools that were more available for the plants and have thus maintained a yield equivalent to the plots having received these nutrients even after more than 100 years without any inputs. Nevertheless, the total pools of these 2 nutrients decreased in all plots over the time. At the nitrogen level, the absence of nitrogen input in some plots did not differentiate them from other plots in terms of total nitrogen contained in the soil, but this lack of inputs had influenced the vegetation with grain yields that were 3 times lower in the plots that did not receive nitrogen fertilization. The importance of residual P and K stocks in soils for reducing the use of mineral fertilizers was therefore highlighted in this study. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://matheo.uliege.be/bitstream/2268.2/7686/4/TFE_clemence_bruwier.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
