APSIMAgricultural Production Systems Simulator
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To investigate whether knowledge of soil's subsoil constraint status would change the optimal nitrogen (N) rate and improve profits, APSIM simulations were obtained for 4 levels of subsoil Cl.
These trials are generating key growth and development data in contrasting environments necessary for the development of a new APSIM taro crop model.
Our simulations using APSIM also revealed that 39 t DM/ha simulated yield (under non-limiting N and water) may be achievable from the same triple-crop CFR not only from Camden, but also from Hunter Valley and North Coast sites (Islam and Garcia, 2010).
Running an APSIM simulation before making management decisions can save farmers significant amounts of money.
Before the team will stake its reputation on APSIM, however, the framework is being subjected to a rigorous program of validation and development.
For simplification, three cultivars for each crop representing early, middle and later maturity cultivars were selected from the listed default cultivars in the parameter files released with APSIM model for each zone.
The APSIM predictions of a several-fold increase in deep drainage under zero-tillage winter cropping with lax management of crop health suggest an increase in wetting front velocity from historical values of ~0.
The performance of the ePTF was assessed by using it to construct APSIM simulations and compare against drainage data from lysimeter experiments.
2) Fitting of parameters to the first APSIM dataset (training dataset);
Keating BA, Carberry PS, Hammer GL, Probert ME, Robertson MJ, Holzworth D, Huth NI, Hargreaves JNG, Meinke H, Hochman Z, McLean G, Verburg K, Snow V, Dimes JP, Silburn M, Wang E, Brown S, Bristow KL, Asseng S, Chapman S, McCown RL, Freebairn DM, Smith CJ (2003) An overview of APSIM, a model designed for farming systems simulation.
These yields are only about 50% of the potential yields (defined as water-limited yield potential) estimated using the APSIM model (5-6 t/ha for wheat, 3-4 t/ha for canola; Zhang et al.
opt] is optimal N fertiliser rate (kg/ha), A is water-limited potential yield (kg/ha) obtained from APSIM modelling or can be estimated from other sources, By is price of yield (AU$/kg), [B.