[1] Higher Agron Inst Chott Mariem, Sousse, Tunisia
[2] Natl Inst Agron Res Tunisia, Ariana, Tunisia
[3] Natl Agron Inst Tunisia, Tunis, Tunisia
[4] Higher Agron Inst Chott Mariem, Regional Ctr Res Hort & Organ Agr, Sousse, Tunisia
[5] Tech Ctr Organ Agr, Sousse, Tunisia
[6] Support Res Stn Mannouba, Interprofess Grouping Vegetables, Mannouba, Tunisia
[7] Natl Inst Agron Res Tunisia, Ariana 2049, Tunisia
[8] Reg Ctr Res Hort & Organ Agr, Higher Agron Inst Chott Mariem, Sousse, Tunisia
[9] Natl Agron Inst Tunisia, Tunis, Tunisia
[10] Tech Ctr Organ Agr, Sousse, Tunisia
[11] Interprofess Grouping Vegetables, Support Res Stn Mannouba, Mannouba, Tunisia