RESPONSE OF SUMMER ONION TO INTEGRATED NITROGEN MANAGEMENT

Abstract

Response of summer onion (41/inn) cepu var. BAR] Piaz-2) to integrated nhlrogen management was assessed iii a held experiment carried ott t on a Si liv U lay I .oam soil having p1-1 6.0 lit Shcr-e-E3angla Agricultural L.niversity Farm. Dhaka during the kiwi/f season of 2007. 1.rea. cowdunu (CD) and veriiticonipost (VU) were combined in a way to supply N at 120 kg ha' from the sources such no urea. C!) and kg from urea. CD and VU: 100 kg from urea with 20 kg from CD or VC. 80 I%L, from urea '. ith 40 kg from CD or VU. 60 kg from urea with 60 kg ironi UI) or \U. 40 kg from urea t itli 80 LL, . from ('I) or VU arraitued lit a RCI3I) desint lilt three repiicaiions and tclve treatnenis. the results indicated that IlliI\iItttllll bulb ield [2.]6 ha and stover yield (546 I ha ) ol summer onion were obtamed iii treatment receiving 80 kg N ha 'from urea with -10 kg N ha suhstiltmied h ('I) ( T- [bllowed In the treatment receiving 80 kg N ha from urea with .10 kg N ha substituted by VU (I). Comparing with other fertilizer treatments, the yields t ere sign Iieantiv lower in treatments where N from urea source was below 50%. ihe highest N. P. K and S content in bulb (2.30%. 0. I 85%. I .7 1% and 0.96%, respectivel> and in leaf (2.91%. 0.183%. 2.450 1, and 0.98%. resjwetivelv "as recorded in trea(nient 1< ibI lowed In L.. Similarly, the N. P. K and S uptake 72.78. 5.53. 55.88 and 28.93 kc.z ha . respceti clvi by onion plants at hatvest stage was also siwiilie:uitiv 01<0.0 I ) greater in treatments itceiving 80 ku N lia Iiomn urea with 40 kg from CD (l ) Ibllowed by treatment 1 thus tile data suggest that integrated use of N 80 kg from urea with 40 kg from Cl) or 80 kg 1mm urea with 40 kg from 'IC has produced maximum yields and is therefore reconlmended for advantageous onion pt'odtie lion.