Friday 2 October 2020
13.00 BST / 14.00 CEST
Phosphorus (P) availability during the depletion of soil P
Sophie Nawara, Fien Amery, Hilde Vandendriesschea, Roel Merckxd and Erik Smolders
As an essential element for crop growth, phosphorus (P) has been added excessively to many agricultural soils during the last decades. This created an imbalance between P input (P fertilisation) and crop P offtake, which caused an accumulation of P in soils in some regions of western and southern Europe. Currently, a more sustainable and stricter P fertiliser use is promoted, which led to negative soil P balances in some European regions (i.e. depletion). It is expected that the availability of P in a soil P depleting scenario is smaller than in a P accumulation scenario, due to the hysteresis of the sorption-desorption processes.
This webinar will focus on determining crop and soil factors affecting the availability of soil P in a soil P depleting scenario, and the identification of a soil test which adequately predicts this P availability in a P depleting scenario.
Integrating new bio-based fertilisers with mineral fertilisers to meet crop and soil nutrient requirements: challenges and opportunities
Patrick Forrestal, Teagasc, Ireland
The use of conventional nitrogen (N), phosphorus (P) and potassium (K) mineral fertilisers along with advances in plant breeding, pest, weed and disease control has underpinned growth in agricultural productivity over the past century. At an EU level a decline in the reliance on conventional mineral fertilisers and a growing focus on bioeconomy opportunities such as the recovery and recycling of nutrients to produce renewable bio-fertilisers is envisaged as part of the Farm to Fork Strategy. The recycling of nutrients from organic sources has been a feature of agriculture for generations particularly where animal and crop agriculture are geographically in close proximity making transport of low nutrient density materials feasible. However, concentration of animal agriculture and human populations in recent decades has led to pronounced regional imbalances in nutrient distribution. Recapture and concentration of these nutrients for transport and integration into fertiliser programmes presents a host of challenges but also opportunities.
Teagasc, part of the EU INTEREG funded ReNu2Farm and H2020 funded Nutri2Cycle projects, are developing the solutions and knowledge needed for successful integration of new bio-based fertilisers along with organic manures and conventional mineral fertiliser in arable and grassland fertiliser programmes. Insights from this on-going work including mineral N and P replacement values of new bio-based fertilisers and their performance in fertiliser programmes will be shared in the forthcoming presentation.
This webinar is supported by the Agricultural Industries Confederation – supporting a sustainable food chain.