ABSTRACT
To evaluate effects of drainage on crop yield physical and biological processes occurring in spring, growing season and autumn have been studied in detail. This paper deals with the influence of drainage upon:
– groundwater table depth and waterlogging during winter time;
– number and time of occurrence of workable days for sowing and planting operations;
– duration of germination and time of emergence in dependence on soil water water content and -temperature;
– water uptake, development and growth of crops.
A number of relationships and models have been developed and combined into an integrated model approach that considers all those effects. The model operates on a daily basis using actual weather and soil data. It has been tested for various conditions in the field.
Results of 30 years of model simulation on potatoes grown on two soil types for five different drain depths and three drain intensities are presented.
