Articles
SEED QUALITY OF CULTIVARS CRIOLLA INTA AND SELECTED TYPE DANVERS (DAUCUS CAROTA L.) ACCORDING TO THE HARVEST TIME AND UMBEL ORDER
Article number
938_5
Pages
49 – 55
Language
English
Abstract
Carrot-seed quality was evaluated depending upon the order of umbel from which they were obtained and the time of harvest.
Harvest was set up as early, medium, and late in coincidence with maturity of seeds on primary, secondary, and tertiary umbels respectively.
The cultivars Criolla INTA, obtained by mass selection from local carrot populations of Argentina, and a selected type of Danvers, a standard cultivar used in industrial processing, were evaluated.
The trial was performed at the La Consulta Experimental Station, INTA, Mendoza, Argentina (lat 33º45S, long. 69º02W). Harvesting was done by hand with umbels subsequently dried in the dark, then threshed and the seeds ventilated.
Samples were analyzed for the germination percentage, weight of a thousand seeds, conductivity and percentage of emergence in the field.
Seeds from tertiary umbels harvested at the earliest date showed minor germination percentage, vigor and emergence as compared to the remaining collections.
The quality of seeds harvested in bulk, however, was not significantly affected by the harvest date.
Germination percentage of bulk seeds was 92 and 91% for Criolla INTA and Danvers, respectively.
Analysis of conductivity was correlated with emergence in the field and the number of normal plantlets observed at 7 d for both cultivars.
The emergence was higher at a medium and late stage of maturity for both cultivars.
Yield differences were observed between the second and third dates of harvest, with yield diminished by 19% in Criolla INTA, but 52% in Danvers. Recommendations are for harvesting seeds at an intermediate date, considering the maturity of second-order umbels where the major yield is observed, and the total quality of the seeds was not affected.
Harvest was set up as early, medium, and late in coincidence with maturity of seeds on primary, secondary, and tertiary umbels respectively.
The cultivars Criolla INTA, obtained by mass selection from local carrot populations of Argentina, and a selected type of Danvers, a standard cultivar used in industrial processing, were evaluated.
The trial was performed at the La Consulta Experimental Station, INTA, Mendoza, Argentina (lat 33º45S, long. 69º02W). Harvesting was done by hand with umbels subsequently dried in the dark, then threshed and the seeds ventilated.
Samples were analyzed for the germination percentage, weight of a thousand seeds, conductivity and percentage of emergence in the field.
Seeds from tertiary umbels harvested at the earliest date showed minor germination percentage, vigor and emergence as compared to the remaining collections.
The quality of seeds harvested in bulk, however, was not significantly affected by the harvest date.
Germination percentage of bulk seeds was 92 and 91% for Criolla INTA and Danvers, respectively.
Analysis of conductivity was correlated with emergence in the field and the number of normal plantlets observed at 7 d for both cultivars.
The emergence was higher at a medium and late stage of maturity for both cultivars.
Yield differences were observed between the second and third dates of harvest, with yield diminished by 19% in Criolla INTA, but 52% in Danvers. Recommendations are for harvesting seeds at an intermediate date, considering the maturity of second-order umbels where the major yield is observed, and the total quality of the seeds was not affected.
Authors
J.G. Valdez, J.C. Gaviola
Keywords
germination percentage, vigour, emergence, production areas
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