www.wjpr.net Vol 4, Issue 11, 2015. 214 Mollah et al. World Journal of Pharmaceutical Research INTEGRATED CROP MANAGEMENT FOR PRODUCTION OF TRUE SEEDS OF ONION M. R. A. Mollah 1* , M. A. Ali 2 , M. Ahmad 3 , M. K. Hassan 4 and M. J. Alam 5 1 On Farm Research Division, Bangladesh Agricultural Research Institute, Bogra, Bangladesh. 2 Department of Plant Pathology, BAU, Mymensingh, Bangladesh. 3 Department of Entomology, BAU, Mymensingh, Bangladesh. 4 Department of Horticulture, BAU, Mymensingh, Bangladesh. 5 Department of Seed Science &` Technology, BAU, Mymensingh, Bangladesh. ABSTRACT Onion is a biennial crop. True seed is used for bulb production in the first year, and these bulbs are used as planting material in the second year for true seed production. The present study was under taken on onion seed production where seed production is possibly only winter period after which rapid increase in temperature as well as early shower adversely affect the quality of seed. The experiment was laid out in a randomized complete block design with four replications to determine the effect of frequency of application of pesticides and optimum doses of manures & fertilizers for maximizing quality true seeds of onion. Five treatments viz. T 1 = Spices Research Centre (SRC) recommended dose of fertilizer + Rovral spray at 15 days interval upto maturity stage + no spray of Admire T 2 = Modified dose of fertilizer + Rovral spray at 15 days interval upto maturity stage + no spray of Admire T 3 = No manures & fertilizer application + Rovral spray at 15 days interval upto maturity stage + no spray of Admire T 4 = SRC recommended dose of fertilizer + No spray of Rovral and Admire T 5 = Modified dose of fertilizer + 3 sprays of Rovral at vegetative, umbel formation (70%) and flowering (70%) stage) + 1 spray of Admire at flowering stage were consisted to achieve the objective. The research work was done at On-Farm Research Division, BARI, Bogra during September, 2011 to June, 2012. The results revealed that the growth parameters, seed yield components, health and quality of harvested seeds were significantly influenced by the different World Journal of Pharmaceutical Research SJIF Impact Factor 5.990 Volume 4, Issue 11, 214-225. Research Article ISSN 2277– 7105 Article Received on 01 Sep 2015, Revised on 23 Sep 2015, Accepted on 14 Oct 2015 *Correspondence for Author M. R. A. Mollah On Farm Research Division, Bangladesh Agricultural Research Institute, Bogra, Bangladesh.