Nutrient interactions and salinity effects on plant uptake of phosphorus from waste-based fertilisers
Many organically managed farms in Europe have low levels of soil phosphorus (P). Arable farms that rely strongly on biological nitrogen fixation (BNF) have been shown to have rather low outputs and a tendency to deplete soil P and potassium (K) compared with arable farms that have a lower reliance on BNF and higher external […]
Nutrient interactions and salinity effects on plant uptake of phosphorus from waste-based fertilisers
RELACS – Improving inputs for organic farming – Many organically managed farms in Europe have low levels of soil phosphorus (P). Arable farms that rely strongly on biological nitrogen fixation (BNF) have been shown to have rather low outputs and a tendency to deplete soil P and potassium (K) compared with arable farms that have […]
Phosphorus sources for organic agriculture
Project RELACS – Improving inputs for organic farming. On many organic farms, especially those without livestock, phosphorus (P) exports through the sale of produce is greater than P imports through fertilisers and purchased animal feed. While soil P reserves from residual fertiliser applied before conversion to organic farming can often deliver P for decades, mining […]
Results of the BfR MEAL Study: The food type has a stronger impact on calcium, potassium and phosphorus levels than factors such as seasonality, regionality and type of production
Published in “Food Chemistry”. The BfR MEAL Study aims to provide representative levels of chemical substances in foods consumed by the population in Germany for dietary exposure assessment. Calcium, potassium and phosphorus (Ca, K, P) are essential to obtain physiological functions in humans. Levels were investigated in 356 foods. Foods were purchased representatively, prepared as typically […]
Livelli di fosforo, potassio e calcio nei prodotti alimentari biologici e convenzionali: una ricerca tedesca
Uno studio tedesco, BfR MEAL , ha analizzato 356 prodotti alimentari e ha trovato livelli simili di fosforo (P), potassio (K) e calcio (Ca) tra prodotti biologici e non biologici (convenzionali). Differenze significative sono emerse per le olive: Ca più basso, forse dovuto all’additivo cloruro di calcio usato nel sistema convenzionale, K più alto, forse […]
Struvite’s potential as an alternative phosphorus source for organic agriculture
All crops need phosphorus (P) to grow. Negative P budgets deplete the soil’s P reserves in the long term. In organic farming, there are only a few permitted P sources. Use of P fertiliser can be crucial, especially when reliance on biological nitrogen (N) fixation is high. Solution Struvite (magnesium ammonium phosphate) is a naturally […]
