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The development of crop and soil process models, and their incorporation into decision support systems (DSSs) for the practical management of agricultural production, have made a significant contribution to the focus and integration of research by agricultural scientists. However, such DSSs...
The potential impact of global warming and the enhanced atmospheric CO 2 concentration on grassland management on dairy farms within the UK requires assessment. This has led to the development of a mathematical model of the grazing dairy cow. The model, that embraces grass and grass-white clover...
The problems of defining and measuring the productivity of grazing and foraging livestock are reviewed. It is proposed that the economic margin per unit of forage is an appropriate index of productivity for many livestock production systems, allowing comparison of the efficiency with which...
The effect of average low-quarter requirement depth of irrigation and uniformity of applied water on the estimation of inflow rate and cutoff time of furrows and level basins is evaluated, using the SRFR-surface irrigation model and different intake rate soil characteristics. The optimum inflow...
To simulate rice growth and yield accurately, models must integrate growth and morphogenetic processes. Widely used models such as ORYZA1 give much consideration to environmental effects on growth (e.g. carbon assimilation) but assume that assimilate partitioning among organs is independent of...
In this paper, a pedigree of the crop growth simulation models by the ‘School of de Wit’ is presented. The origins and philosophy of this school are traced from de Wit's classical publication on modelling photosynthesis of leaf canopies in 1965. It is shown how changing research goals and...
The usefulness of deterministic simulation models has increased in agricultural applications. This increase must be matched with the use of analytical tools that can verify and validate their performance and help interpret their output. Values of model input variables can be selected by the...
GLYCIM, a mechanistic model of soybean ( Glycine Max L.) growth and development, requires soil hydraulic parameters as input. These data are usually not readily available. The objective of this study was to compare yields calculated with measured hydraulic properties to those calculated with...
The concepts of ‘forage functioning’ and ‘field function’ were developed to analyse grassland utilization within the overall management of farms. This approach enabled us to identify functional relations between the main farm components: fields with their agronomic characteristics, field...
The purpose of the study was to assess the effect that global warming and changes in atmospheric CO 2 concentration would have on grassland production within Scotland. This required the development of a mathematical model of herbage production that was responsive to climatic factors and changes...
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