DEVELOPMENT AND YIELD OF PLANTS IN FUNCTION OF ENVIRONMENTAL AND ECONOMIC FACTORS

In the planning phase of the biological process the species and variety is chosen. Growing includes 3 main tendencies. At the beginning growth and regeneration tendency are vigorous, only to gradually decrease and be replaced by fruit forming. The biological process can be divided into phases. Partial results of the phases depend on favourable environmental factors. Losses met with in the different phases decrease - depending on regeneration - the final result of production.

In the planning phase of environment the site is chosen. It affects the biological process in 3 main groups: damages, chemical and physical factors. Unfavourable conditions can cause damage, for instance want of space. Damages are also caused through injuries and diseases. Chemical factors include water and nutrient elements; physical factors include temperature as the most important in effecting the biological process.

The economic process is started by choosing cultural methods and by accomplishing production partial tasks. The time needed for accomplishing tasks requires suitable production capacity. Production capacity uses up production costs which are connected with the partial results. The sums of partial results make up the final result: yield.

The biological process, environment and the economic process and their factors form a system, the parts of which interact in a complicated manner. In mathematical modelling more factors should be used as variable. Data of recent trials can be utilized but new research is also needed.

Download Adobe Acrobat Reader (free software to read PDF files)