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STUDIES ON HYBRID SEED PRODUCTION IN CARROT (Daucus carota L.)
| Content Provider | KrishiKosh-Indian National Agricultural Research System |
|---|---|
| Advisor | V.K.Pandita |
| Researcher | Sutradhar, Hrishikesh |
| Abstract | The present investigation entitled “ Studies on hybrid seed production in carrot (Daucus carota L.)†was carried out during the period 2014-16 in the research field of Seed Production Unit (SPU) at ICAR - Indian Agricultural Research Institute (IARI), New Delhi to establish the effect of planting density and row ratio on carrot hybrid seed yield and quality, to determine the contribution of different order of umbel to seed yield and quality and to study the foraging behaviour of pollinators in parental lines of Pusa Vasuda. Among the two planting ratios of 1:4 and 1:6, higher seed yield (380.1 kg/ha) was obtained in 1:6 with a closer spacing of 60×20 cm which was 12.7% higher as compared to the yield obtained under 1:4 (332 kg/ha) at similar spacing. The per cent contribution to mean seed yield was higher in the first row of the seed parent (58.6% and 48.5% in 1:4 and 1:6, respectively) that was adjacent to the pollen parent. No significant differences was observed for seed germination, seedling length and seedling vigour among the different planting ratios and plant spacing. The mean values of primary umbel was better across all plant spacing in terms of umbel diameter (9.2 cm and 8.9 cm in 1:6 and 1:4, respectively), seed germination (71.7% and 72.2% in 1:6 and 1:4, respectively), thousand seed weight (2.162 g and 2.152 g in 1:6 and 1:4, respectively) , seedling length (16.7 cm in both 1:6 and 1:4) and seed vigour index 1 (1202 and 1210 in 1:6 and 1:4, respectively) than secondary and tertiary umbels. The major contribution to seed yield per plant across all plant spacing was by secondary umbels (65.1% and 65% in 1:6 and 1:4, respectively). However the highest contribution to seed yield per plant by primary umbel was under closer spacing (60×20 cm) which was 40.4 % and 42.3% and it reduced gradually with increasing plant spacing. But for the secondary umbels, the highest contribution to seed yield per plant was under wider spacing (60×60 cm) which was 71.4 % and 71.3% and it reduced gradually with decreasing plant spacing. The maximum pollinator activity was observed at 11 A.M and total number of pollinator visit was more in umbels of pollen parent compared to seed parent. The pollinators were also found to be mostly concentrated on the first row of the seed parent in both planting ratios. In pollen parents honey bees were the major pollinators whereas in seed parent, syrphid flies were found to be the predominant pollinators. Seven different species of syrphid flies viz. Mesembrius sp, Eristalinu obscuritarsis, Eristalinu aeneus, Eristalinu arvorum, Ischiodon scutellaris, Episyrphus viridaureus, Eristalinu obliquus were found visiting carrot hybrid seed production plot. |
| File Size | 2230345 |
| File Format | |
| Language | English |
| Publisher | Division of Seed Science and Technology ICAR†Indian Agricultural Research Institut New Delhi |
| Access Restriction | Open |
| Subject Keyword | Studies On Hybrid Seed Production In Carrot (daucus Carota L.) Seed Science and Technology |
| Content Type | Text |
| Educational Degree | Doctor of Philosophy (Ph.D.) |
| Resource Type | Thesis |
