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Abstract
Five reproductive efficiency methods (REM) were evaluated under field condition to measure yield in 12 varieties of
Brassica campestris L. in 2005 and 2006 at Mymensingh (240
75′ N latitude and 900
50′ E longitude) based on flower
and siliqua production and total reproductive unit (TRU- number of buds, flowers, siliqua and number of empty
pedicels). Five REMs were estimated and they were REM-I [ (Mature siliqua ÷ TRU) × 100]; REM-II [(Mature siliqua ÷
Flower number) × 100]; REM-III [{(Mature siliqua + Immature siliqua) ÷ TRU} × 100]; REM-IV[{(Mature siliqua +
Immature siliqua) ÷ Flower number} ×100]; and REM-V [(Flower number ÷ TRU) × 100]. Siliqua number plant-1
showed positive and significant relationship with TRU (r=0.869** and 0.713** in 2005 and 2006, respectively) and
flower number (r=0.984** and 0.834** in 2005 and 2006, respectively). Path analysis revealed that there exited high
positive direct effect of siliqua number with sink (flower) number (0.655 and 0.714 in 2005 and 2006, respectively)
and TRU (0.201 and 0.252 in 2005 and 2006, respectively). Among the REMs, REM-III had high positive direct effect
with only siliqua production (1.331 and 0.899 in 2005 and 2006, respectively). For the first time we report REMs in
mustard that number of sink production is an important index of siliqua yield and REM-III appears more reliable
method of estimating RE in Brassica campestris.