Duration of the onion growing stages of the Empasc 352 - Bola Precoce variety in a subtropical climate of Ituporanga, Santa Catarina

Abstract

The objective of the work was to evaluate the phenological patterns of the onion cultivar Empasc 352 - Bola Precoce, when submitted to different climatic and photoperiodic conditions of the subtropical climate of Santa Catarina, SC, Brazil. The treatments consisted of 10 sowing times, separated by one week, repeated from 03/15 to 05/17 for four years. From the results, a non-linear relationship was observed between the sowing dates and the duration in days until transplantation, represented by a second-degree polynomial regression. The later sowing dates showed a significant increase in the sowing-transplant duration. As the sowing seasons were postponed, there was a decrease in the period between transplant-harvest. The relationship between the duration of the sowing-transplant and transplant-harvest phase was reversed, that is, a longer duration of the sowing-transplant phase and shorter in the transplant-harvest phase. It is concluded, therefore, that the sowing date is important for the onion cycle duration. Every two days of advance on the sowing date corresponded to three days on the transplant date.