The study of the potato’s life-cycle phases important to the increase of the individual variability

The authors describe the practical importance of the knowledge of the potato’s life-cycle phases. There was made a research about the life-cycle of some varieties created at the Potato Research and Development Station Targu-Secuiesc, aiming at the proper management of the crop care, the irrigation and fertilization of the crops, depending on their objective.The varieties Redsec, Ioana, Luiza and Star are semi-late maturing varieties, with a vegetative period of 80 – 110 days, each of them displaying certain specific features during the growth and development period that are highlighted in the present research paper.