TY  - JOUR
A1  - Gasser, S. Anton A.
A1  - Nielsen, Kerstin
A1  - Eichler‐Löbermann, Bettina
A1  - Armbruster, Martin
A1  - Merbach, Ines
A1  - Franko, Uwe
T1  - Simulating the soil phosphorus dynamics of four long‐term field experiments with a novel phosphorus model
Y1  - 2023-02-01
VL  - 39
IS  - 2
SP  - 867
EP  - 880
JF  - Soil Use and Management
DO  - 10.1111/sum.12881
PB  - 
N2  - Phosphorus is a nonrenewable resource, which is required for crop growth and to maintain high yields. The soil P cycle is very complex, and new model approaches can lead to a better understanding of those processes and further guide to research gaps. The objective of this study was to present a P‐submodel, which has been integrated in the existing Carbon Candy Balance (CCB) model that already comprises a C and N module. The P‐module is linked to the C mineralization and the associated C‐pools via the C/P ratio of fresh organic material. Besides the organic P cycling, the module implies a plant‐available P‐pool (P<sub>av</sub>), which is in a dynamic equilibrium with the nonavailable P‐pool (P<sub>na</sub>) that comprises the strongly sorbed and occluded P fraction. The model performance was tested and evaluated on four long‐term field experiments with mineral P fertilization, farmyard manure as organic fertilizer and control plots without fertilization. The C dynamics and the P<sub>av</sub> dynamics were modelled with overall good results. The relative RMSE for the C was below 10% for all treatments, while the relative RMSE for P<sub>av</sub> was below 15% for most treatments. To accommodate for the rather small variety of available P‐models, the presented CNP‐model is designed for agricultural field sites with a relatively low data input, namely air temperature, precipitation, soil properties, yields and management practices. The CNP‐model offers a low entry threshold model approach to predict the C‐N and now the P dynamics of agricultural soils.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11188
ER  -