Improved prediction of optimal N fertilizer rates for corn (Zea mays L.) can reduce N losses and increase profits. We tested the ability of the Agricultural Production Systems sIMulator (APSIM) to simulate corn and soybean (Glycine max L.) yields, the economic optimum N rate (EONR) using a 16-year field-experiment dataset from central Iowa, USA that included two crop sequences (continuous corn ...

Abstract Process-based agricultural system models are a major tool for assessing climate-agriculture-management interactions. However, their application across large scales is limited by computational cost, model uncertainty, and data availability, hindering policy-making sustainable production at the scale meaningful land management farmers. Using Agricultural Production System sIMulator (APSI...

The Lower Burdekin Delta (LBD) is located on the dry-tropical coastal strip in North Queensland, Australia. The region is Australia’s largest sugar producing area with approximately 38,000 hectares of land under sugarcane. However, the LBD also borders the Great Barrier Reef World Heritage Area (GBRWHA). Thus industry, community, and federal, regulatory and environmental organisations are inter...

The global optimization of parameters in process-based crop models is often considered computationally expensive. Gaussian process (GP) emulation a widely used method for reducing the computational burden process. Total above-ground biomass and cane dry weight three Thai sugarcane cultivars (KK3, LK92-11 02-2-058) collected under rainfed irrigated conditions were to optimize cultivar-specific A...

Abstract A new model for grapevines (Vitis vinifera) is the first perennial fruit crop using Agricultural Production System sIMulator (APSIM) Next Generation framework. Modules phenology, light interception, carbohydrate allocation, yield formation and berry composition were adapted or added into APSIM to represent nature of fruit-bearing vines. The simulated grapevine phenological cycle starts...

An accurate and management sensitive simulation model for tile-drained Midwestern soils is needed to optimize the use of agricultural management practices (e.g., winter cover crops) to reduce nitrate leaching without adversely affecting corn yield. Our objectives were to enhance the Agricultural Production Systems Simulator (APSIM) for tile drainage, test the modified model for several manageme...

One of the challenges to increase milk production in a large pasture-based herd with an automatic milking system (AMS) is to grow forages within a 1-km radius, as increases in walking distance increases milking interval and reduces yield. The main objective of this study was to explore sustainable forage option technologies that can supply high amount of grazeable forages for AMS herds using th...

The response of wheat crops to elevated CO2 (eCO2 ) was measured and modelled with the Australian Grains Free-Air CO2 Enrichment experiment, located at Horsham, Australia. Treatments included CO2 by water, N and temperature. The location represents a semi-arid environment with a seasonal VPD of around 0.5 kPa. Over 3 years, the observed mean biomass at anthesis and grain yield ranged from 4200 ...