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- W2128112379 abstract "Simulation of sequences of crops involves more than judging crop models on their ability to predict crop yield. The carry-over effects of crops in terms of soil water and nitrogen dynamics are discussed. APSIM’s ability to simulate sequences of crops is illustrated for (1) a selection of treatments from the Warra Soil Fertility Restoration Experiment (continuous wheat, wheat- chickpea and wheat-lucerne), and (2) a comparison of annual crops (sorghum and barley) with lucerne on a deep black earth at Jimbour, Qld where lucerne dried out the profile to at least 3m. Finally some comments are made on challenges to be faced in order to simulate a flooded rice- wheat system. Introduction In talking of crop modelling, it’s all too easy to use language that refers to “a wheat model” or “a rice model” or “a model for some other crop”. But the real world of farming is not composed of single crops. The Agricultural Production Systems Simulator, APSIM (McCown et al. 1996) developed out of the recognition that crops come and go, like other aspects of management. Simulation of farming systems needs to be able to deal with sequences of crops, and in some instances mixtures of crops. Because of this tendency to think of models of single crops, the performance of models also tends to focus on how well they predict the growth/development of individual crops. Typically, the soil conditions (water and nitrogen) are specified prior to planting together with the sowing and other management details, and then the output from the model is likely to concentrate on aspects of plant growth, and especially final yield, and how the predictions match up from what is observed. To change the focus from a single crop to a sequence of crops (either the same crop or a rotation of different crops), is a much more demanding task. It also creates a need for data sets that are quite different from those that are used to develop/validate a model of the growth of an individual annual crop. Modelling of perennial crops (such as sugarcane or lucerne) has much in common with modelling sequences of annual crops. © 2002 CSIRO. Published in Humphreys, E., and Timsina, J. (Eds.) (2002). Modelling irrigated cropping systems, with special attention to rice-wheat sequences and raised bed planting. Proceedings of a Workshop, CSIRO Land and Water, Griffith, NSW, Australia, 25-28 February 2002. CSIRO Land and Water Technical Report 25/02." @default.
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- W2128112379 date "2005-10-20" @default.
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- W2128112379 title "Modeling Irrigated Cropping systems with Special Attention to Rice Wheat Sequences and Rice Bed Planting" @default.
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