Most of the lectures are in Danish, but there are several talks in English, including Iris Vogeler’s. Read more about Plantekongres 2019 and sign up for it here. At higher fertilisation rates mineralisation of the catch crop residue had no effect on the grain yield. The grain yield of the spring barley was increased by 16 percent when no nitrogen fertiliser was applied.
The computer model predicted a reduction of 70 percent. According to the measurements, nitrogen leaching was reduced over the winter/autumn period by 80 percent (from 47 to 10kg N/ha). The comparison between the experimental and modelled results showed good general agreement. The main crop, spring barley, was sown in April and harvested in August 2016. The soil was either left bare or sown with a fodder radish catch crop over the autumn period.
#Soil mineral nitrogen apsim trial
The simulations were based on a one-year trial carried out at AU Flakkebjerg in Denmark starting in August 2015. The researchers took into account the amount and rate of mineral nitrogen released from catch crop residues depending on their biochemical composition. References Addiscott TM, Whitmore AP (1987) Computer simulation of changes in soil mineral nitrogen and crop nitrogen during autumn, winter and spring. This new framework provides a library of process submodels that can be coupled, at runtime, to construct a model in much the same way that models can be coupled to construct a simulation.
#Soil mineral nitrogen apsim simulator
APSIM is a highly advanced simulator of agricultural systems and can simulate a range of plant, animal, soil, climate and management interactions. The APSIM Soil Nutrient model has been developed using approaches similar to those employed in the APSIM Plant Modelling Framework (PMF) of Brown et al., 2014. With her colleagues in the Department of Agroecology, she used a computer modelling system called Agricultural Production Systems Simulator Model (APSIM) to determine the effect of catch crops on nitrogen leaching and nitrogen supply for the subsequent crop. Subsequent mineralisation of the catch crop residues can result in an increased nitrogen availability for the following commercial crop, says Iris Vogeler. As pressures to improve efficiency and reduce environmental impacts of intensive cropping systems increase, attention has been directed towards the use of catch crops during the fall-winter season to reduce nitrogen leaching. But how well do catch crops perform? And how well can we predict their performance using computer models? Senior Researcher Iris Vogeler from the Department of Agroecology at Aarhus University will provide answers to these questions in a lecture at the annual Danish crop congress Plantekongres 2019 that will be held in Herning January 15-16, 2019. Catch crops can reduce nitrogen leaching and increase the availability of nitrogen for the subsequent crop.
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