May 1, 2019 Thesis Open Access

KEBEBEW GOSAYE

DCAT Export

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    <dct:title>DETERMINATION OF THE CRITICAL PERIOD OF WEED IN FOOD BARLEY (Hordeum vulgare L.) COMPETITION IN BALE HIGH LANDS, SOUTH EASTERN ETHIOPIA</dct:title>
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    <dcat:keyword>Critical period; grain yield; weed-crop competition; yield loss</dcat:keyword>
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        <foaf:name>Abdulkerim Jemal Ass. Prof.</foaf:name>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2019-05-01</dct:issued>
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    <dct:description>&lt;p&gt;Food barley is among the most important food crop for smallholder farmers in Ethiopia. However, its yield is constrained by weed infestations. A study was conducted in 2018 cropping season at Madda Walabu University and Sinana Agriculture Research Center, with the objective of determining the critical periods of weed-interference and yield losses in food barley. The experiment consisted of sixteen treatments in two sets, i.e. one weed free and one weedy set each comprising weed competitions and weed free durations up to 10, 20, 30, 40, 50, 60 and 70 days after crop emergence and harvest. It was laid out as a Randomized Complete Block Design with three replications for each set. The result showed that dominant weed species were Galinsoga parviflora and Guizotia scabra with the highest relative densities of 23.2% and 13.7% at Madda Walabu University and Avena fatua L and Amaranthus hybridus L. with the highest relative densities of 15.6% and 12.6% at Sinana Agriculture Research Center. Furthermore, weed density, total weed density and dry weight, days to 90% physiological maturity, plant height, spike length, number of tillers, number of seed perspike, thousand kernel weight, grain yield and above ground dry biomass were affected highly significantly (P&amp;lt;0.01) by Increasing duration weedy period and weed free period. But days to heading and harvest index (HI) were non-significant (P&amp;gt;0.05). With increasing duration of weed interference, weed density, weed dry weight, and the number of days required to reach physiological maturity of food barley were increased whereas the number of effective tiller, number of seeds per spike, spike length, thousand kernel weight, grain yield, aboveground dry biomass, and harvest index of crop were reduced. At Madda Walabu University and Sinana Agriculture Research Center, uncontrolled weed growth significantly reduced food barley grain yield by 66% and 56%, respectively, compared to the grain yield obtained from the weed free check. In conclusion, the results of the study revealed that, to reduce the loss in the grain yield of food barley by more than 10%, it is important to keep the crop weed free between 160 to 580 growing degree days (16 to 70 days after crop emergence) at Madda Walabu University and from 260 to 520 growing degree days (26 to 70 days after crop emergence) at Sinana.&lt;br&gt; &amp;nbsp;&lt;/p&gt;</dct:description>
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