Development of a Soil-plant Phosphorus Simulation Model for Calcareous and Weathered Tropical Soils
| Author | Samira H. Daroub | |
| Author | Argyrios Gerakis | |
| Author | Joe T. Ritchie | |
| Author | Dennis K. Friesen | |
| Author | John Ryan | |
| Date of acession | 2024-03-14T12:27:02Z | |
| Date of availability | 2024-03-14T12:27:02Z | |
| Date of issue | 2003 | |
| Abstract | Phosphorus (P) is a limiting nutrient affecting crop yields in many regions of the world, in particular in areas with highly weathered acid soils and calcareous alkaline soils. Given the many factors associated with P behavior in a range of soil environments, there is a need to go beyond site-specific situations. The use of crop simulation models is a valuable tool to evaluate the efficacy of applying P fertilizers under different soil, management and climatic conditions. A computer model was developed to simulate P in the soil–plant system adapted to soils with high P limitations. The soil P module is operated with two comprehensive crop simulation models (CERES and CROPGRO) within the DSSAT software. The P module comprises inorganic and organic P pools estimated from measured P fractionation data and works on a daily time step. The rate constants for P movement between the pools follow first order kinetics. The P module was calibrated and tested using three data sets from Colombia, Syria, and Tanzania. The limited testing showed that the P module simulated accurately grain yield and P uptake by wheat grown under semi-arid conditions. The wheat crop responded little to fertilization although measured Olsen P was as low as 2.6 mg kg-1 . The P module overestimated P uptake for both soybean and bean crops grown in acidic soils, but predicted with a good degree of accuracy labile P in the soil and P uptake for maize grown under the same acidic conditions. Testing with more data sets is needed to improve model predictions. | |
| Citation | Daroub S.H., A. Gerakis, J.T. Ritchie,D.K. Friesen and J. Ryan. 2003. “Development of a Soil-Plant Phosphorus Simulation Model for Calcareous and Weathered Tropical Soils,” Agricultural Systems, 76:1157-1181. | |
| URL | https://hub.ifdc.org/handle/20.500.14297/2896 | |
| Language | en | |
| Subject | Phosphorus | |
| Subject | Cereals | |
| Subject | Legumes | |
| Title | Development of a Soil-plant Phosphorus Simulation Model for Calcareous and Weathered Tropical Soils | |
| Type | Article |