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Abstract

A field experiment was conducted at the Farm of Bangladesh Agricultural Research Institute, Gazipur during two successive Rabi seasons (2004-2006) to evaluate the different source-sink manipulation technique on the grain and fodder yield of hybrid maize. Six source-sink manipulation treatments viz. T1 = no leaf (source) or cob/ear (sink) removal (control), T2 = maintaining apical ear with sub-apical ear(s) removal, T3= maintaining apical ear with removal of all sub-apical ear(s) and leaves below apical ear leaf, T4= removal of all leaves below ear leaf, 15= maintaining apical ear with sub-apical ear(s) removal and detopping (keeping two leaves above ear) and T6 = detopping (keeping two leaves above ear). Source-sink manipulation (detopping, leaf and ear removal) was done at 10 days after silking. Grain yield was significantly affected by different source-sink manipulation treatments. The highest grain yield (9.5 to 9.7 t/ha) was obtained from control (Ti) treatment while the lowest (7.5 to 7.8 t/ha) in T3 treatment in both the years. Fodder yield varied among different treatments. The highest fodder yield was recorded in 13 treatment with the highest grain yield reduction (20%) and the lowest fodder yield was recorded in 16 treatment with the lowest grain yield reduction (1.33 to 2%). Results revealed that detopping (keeping two leaves above ear) at 10 days after silking could provide a remarkable amount of fodder (5 to 6 t/ha) without a significant grain yield reduction (1.33 to 2%) of hybrid maize.

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