Role of Thinning on Seed Production of Coriander (Coriandrum sativum L.) Singh S.K., Dubey A.K., Srivastava J.P., Singh Sanjive K., Singh M.B. Department of Vegetable Science, Chandra Shekhar Azad University of Agriculture & Technology, Kalyanpur, Kanpur-208 024, India Abstract A field experiment was conducted during rabi season of 1999–2000 to 2001–02 at Vegetable Research Station, Kalyanpur, C.S. Azad Univ. of Agri. & Tech. Kanpur on coriander crop with objective to maintain the suitable spacing through thinning at proper time for seed production. Experiment was laid out in randomized block design with three replications. The eleven treatment combinations of factor(a) spacing of thinning (4, 8 & 12 cm), factor(b) time of thinning (30, 37, 44 days) after sowing and factor(c) with and without thinning were tried. The crop was sown in first fortnight of November. The soil of the experimental plot was sandy loam. The sowing of coriander seed was done at row distance of 30 cm with seed rate of 15 kg/ha. The plant population for crop vary greatly from region to region depending on climate, soil and mamagement practices. More number of branches per plant at wider spacing can compensate for low plant population. Basal application of phosphorus and potash å 40 kg/ha each were appplied as a common dose at the time of last ploughing, nitrogen å 80 kg/ha was applied in two split doses, 50% at sowing time and remaining 50% after first irrigation at suitable soil moisture condition. Crop was harvested during first week of April in each year. Maintenance of spacing through thinning at 12 cm has been found better on the basis of average data. The results also revealed that time of thinning affected seed yield significantly during three years of experimentation. It is observed that thinning is useful than without thinning regarding seed yield. It is concluded that cv. Azad Dhania-1 should be cultivated with a plant population at the spacing of 12 cm with time at 37 days after sowing (19.93 q/ha). Top Keywords Time, thinning, coriander. Top |