EFFECT OF NITROGEN ON THE YIELD OF THREE RAPESEED VARIETIES

Abstract

An experiment was conducted at the Agronomy held of Sher-e-Bangla Agneultural University, Dhaka-1 207. during the period from November, 2006 to March. 2007 with a view to examining the effect of variety and levels of nitrogen on the growth and yield of rapeseed. There were 4 Nitrogen tërtilizer treatments in the experiment such as

= Control, N1 = 60 kg N lii'. N 2 = 120 kg N hi1 and Nl = ISO kg N hz(' and three variety viz. SAU Sharisha-1. BARI Sharisha- II and BARE Sharisha-13 were used in the experiment as the test crop. The experiment was laid out in Randomized Complete Block Design (RCBD) (factorial) with three replications. Variety and nitrogen has significant effect on growth. development, yield and yield aitrihuters of rapeseed. Plant height. dry matter, branches plant* length of main iniloreseenee, number of siliquac in the main inilorescence, siliquae plant". siliqua length, seeds siliqua' weight of 1000 seed, seed yield. stover yield and harvest index were significantly influenced by both variety and nitrogen. The results revealed that nitrogen at the rate of 120 kg ha 4 showed the best result in respect of number of branches plain" number of siliqua plant" and number of seeds siliqua - '. Nitrogen at 120 kg hi' gave the highest seed yield (1974.62 kg ha"). i'hree varieties influenced the growth parameters like plant height, dry matter weight. and the yield components like branches per plant, length of main intlorescence. number of siliquae in the main infloreseenee, siliquae

siliqua length, seeds siliqua", 1000 seed weight. seed yield. stover yield and harvest index. Itowever. the seed yield of rapeseed significantly ditlëred among the varieties. BAR! Sarisha-13 produced the highest yield of 1797.25 kg ha" and the lowest seed yield (1603.13 kg ha") was obtained from the variety SAU Sarisha-l. The interaction effect of variety and nitrogen revealed that three varieties in combination with 120 kg N ha 4 showed the best performance in most of the eases.