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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Partial Substitution of Hybrid Seeds with Open Pollinated Variety
in Single Plant and Double Plants per Hill on Grain Yield and Yield
Components of Maize (Zea mays L.)) ผู้เขียน: Mina Nath Paudel, Joveno S. Lales สื่อสิ่งพิมพ์:pdf AbstractA field experiments was conducted at the Central Experiment Station of the University of the
Philippines at Los Ba n? os to evaluate mixed variety cultivation as productivity-enhancing and costsaving
strategies for maize production. The experiment was laid out in randomized complete block
design with factorial arrangement of treatments in three replications. The variety DK 909, a hybrid was
substituted with USM var 5, an open pollinated variety (OPV) of maize.
Mixed variety cultivation involved mixed stands of hybrid and open pollinated variety planted
in single plant and double plants per hill. Two maize varieties currently grown in commercial scale in
the Philippines were used in the study. Seed substitution significantly influenced grain yield. Nevertheless,
there was no effect of interaction between seed substitution x number of plants per hill. Likewise, the
differences in 100-grain weight, grain weight per plant, ear diameter, ear length, percentage of ear fill,
and shelling recovery were not significant. Grain yield from the mixed stands of 75:25 and 50:50 in
between hybrid and OPV were comparable with that of the pure stand of the hybrid. Substituting 75% of
the recommended seed rate of the hybrid with OPV, however, resulted in significantly lower grain yield
by 1,565 kg/ha. However, plant and ear heights were significantly affected by the interaction between
seed substitution level x number of plants/hill. Simple regression analysis showed that grain weight per
plant and percentage of ear fill accounted for 39% and 30% of the variations in grain yield, respectively.
Therefore the study suggested that hybrid seed substitution could be done by OPV up to 50% levels in
the subsistence agriculture. Economic analysis for cost and benefit showed that gross return was slightly
higher in the pure stand of hybrid than that of 75:25 mixed stands of hybrid and OPV. The pure stand of
the OPV gave the lowest gross return, cost of seeds, and return above variable cost. |
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