HYBRID MAIZE SEED PRODUCTION UNDER DIFFERENT LEVELS OF LIME AND BORON APPLICATION

Abstract

Field trial (in hybrid maize (cv. BARI Uybrid Maize-5) seed production was conducted in Non-Calcareous Floodplain Soils under lista Meander Floodplain (AEZ 3) of Agricultural Research Suttion. BARI, I3urirhat. Rangpur during rob! season of 2007-2008 to find out the optimum lime and boron doses for quality seed production of hybrid maize. Three levels of lime (0.0. 1.5 and 3.0 t hi') and four levels of boron (0. 1.2 and 3kg ha') were used as treatment variables. A blanket dose of N120P35 K6 S,0Zn5 kg ha1 and cowdung 5.0 t ha' were used in the study. The treatments were arranged in a split plot design with 3 replications. Lime treatments were randomly at-ranged in main plot and boron levels in the sub plot. Different fertilizer treatments have created significant influence on growth, yield, yield contributing characters and quality of hybrid maize seed. Leaf area planf', leaf area index (LAI). crop growth rate (CGR) and net assimilation rate (NAR) of female parent of BAR! hybrid niaize-5 was increased sharply from 60 days after sowing (DAS) and reaching maximum at 120 DAS and then declined sharply irrespective of treatment differences. The combined ellect of boron and lime was found superior to their single application. The interaction effect between boron and lime was signiuicant for hybrid maize seed yield. The highest yield (2809 kg) was YHI recorded from boron @2.12 kg ha" and limc ® 1.5 i ha" application. From regression equation, optimum and economic dose for B in respect of without liming was calculated to be 2.40 and 2.39 kg B ha"; with 1.5 I ha"liming, it was 2.13 and 2.12 kg B ha" and with 3 t hi' liming it was 2.0 and 1.99 kg B ha"along with blanket dose of N 120P35 K65S207-n5kg ha" plus 5.0 t cowdung The results revealed that boron @ 2.12-2.13 kg ha" and lime @ 1.5 t hi' along with a blanket dose of N, 20P35K65S20Zn5 kg ha" plus 5.0 t cowdung ha" could be optimum for maximizing the quality seed yield oI'hybrid maize in Rangpur region (AEZ 3).