The creation of planting dates and harvesting dates for the needs of modelling agroekosystem on the global level | Tvorba termínov sejby/sadenia a zberu pre potreby modelovania agroekosystému na globálnej úrovni

Biophysical modelling links the simulation model with geographical information about landscape. For the applications of biophysical model are important input data about landscape, which fit the best real conditions. The gaps in input data on landscape restrict the application of simulation model. The biophysical model EPIC, which is the component of our modelling system needs data on planting and harvesting dates. Available sources of data (FAO aquastat, USDA, 1994) do not provide sufficiently data on planting and harvesting dates required by EPIC model. Regarding this, the object of our work was to supply missing gaps in planting and harvesting dates availability. Missing platning and harvesting dates for crops and countries were taken from the crops with similar cultivation or crops of adjacent countries. For big countries or countries with different natural conditions it is appropriate to separate the country area into smaller regions, which reflected better the real conditions. Table with planting and harvesting dates (GlobPlantDate) was created and includes data on planting and harvesting dates as median of published intervals. Cartographic visualisation of GlobPlantDate table was done via 5arcmin spatial resolution grid with global coverage. GlobPlantDate was compared with planting dates (SimPlantDate), which were taken from the publication of Stehfest (Steh-fest, E. 2005. Modelling of global crop production and resulting N2O emissions: dissertation thesis. Germany: University in Kassel, 2005, 150 pp. From the aspect of spatial resolution GlobPlantDate data are more detailed. From the aspect of content, GlobPlantDate includes date planting and harvesting for the 20 globally most important crops while SimPlantDate provides information only for 4 crops. Among GlobPlantDate and SimPlantDate for wheat, rice, maize and soybean differences were observed in global pattern of planting dates, which is probably caused by different data estimation approach. For the countries of Europe the planting dates for wheat are good comparable in both datasets. In Australia, Africa and Americas there are bigger diferences in reported planting dates of rice in GlobPlantDate and SimPlantDate. Especialy in northern countries of Africa, Australia and USA the planting dates for maize reported by the datasets are markedly different. Reported planting dates of soybean for countries of eastern Asia fluctuate from ends April to July.