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EFFECT OF PLANTING DENSITY ON GROWTH AND YIELD OF IRRIGATED

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					    EFFECT OF PLANTING DENSITY ON GROWTH AND YIELD OF IRRIGATED
          MAIZE AT ENDABAKLA SITE, WUKRO DISTICT, TIGRAY, ETHIOPIA.

Berhan Mengesha, E-mail: mengesha.berhan@yahoo.com Tel: +251914724216
Aksum University Shire-campus.

                                   ABSTRACT

    A study was conducted during the 2007 off-season at Wukro with the objective of
    determining the effect of population density on growth and yield of maize varieties. The
    experiment was laid out with Randomized Complete Block Design with three replications.
    The treatments used were two varieties, Arkibi (local variety ) and Zama (improved
    variety) and four planting densities of , 50000, 25000, 16625 and 86486 plants/ha(farmers
    practice) respectively at constant inter row spacing of 80 cm. Variety treatments showed
    significant difference for all growth parameters except for ear height. Significant
    difference was observed among the population densities for plant height. The highest plant
    height (143cm) was recorded at the population density of 86486 plants /ha and the lowest
    plant height (131.33cm) was recorded at 25000 plants/ha. Significant difference was
    observed among the population densities for cob weight, cob number and kernel number.
    Population density of 16625 plants /ha resulted in significantly (P≤0.05) higher values of
    cob weight (269g), while significantly (P≤0.05) lower values of this parameter was
    recorded as (150.3g) at population density of 86486 plants /ha. Interaction effect of
    variety and population density showed significant difference for cob number per plant and
    kernel number per cob. The highest mean cob number of Zama was recorded at the
    population density of 16625 plants /ha. However, the lowest cob number recorded at
    population density of 86486 plants/ha. The interaction effect of variety and plant density
    resulted in significant effect of kernel number per cob. Significantly higher kernel number
    per cob were recorded from Zama variety as 510 and 506 at population densities of 50000
    and 25000 plants/ha, respectively. The lowest was at 86486 plants/ha. The interaction
    between variety and population density showed significant effect on grain yield. Zama had
    obtained higher grain yield (7.11t/ha) at population density of 50000 plants/ha, but no
    significant difference with 25000 plants/ha, while the lower yield was recorded at the
    population densities of 16625 and 86486 plant/ha. It can be concluded that higher grain
    yield had obtained from Zama variety at the population density of 50000 plants/ha but, no
    significant difference with 25000 and 86486 plants/ha. Being as hybrid, high yield was not
    obtained at higher population density. However, expected response of Zama for high input
    conditions and its expected benefits on high population density was not obtained for grain
    yield. Considering its breeding history and the relatively better growing environment
    provided in the experiment, the obtained grain and stalk yield is not surprising. This
    finding calls for a further study on population density on introduced hybrid; Zama,
    Ethiopian hybrids and local varieties comparable in maturity.

           Key words Maize, planting density, growth, yield
Berhan Mengesha

				
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posted:12/20/2011
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