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Articles by Dereje Assefa
Total Records ( 1 ) for Dereje Assefa
  Gebrelibanos Gebremariam and Dereje Assefa
  Sorghum (Sorghum bicolor L. Moench) is an important food crop in Ethiopian. The plant’s capacity to produce respectable yields under unfavorable growing situations has made it a well-liked crop for many growers. However, the crop’s production is constrained by many biotic and abiotic factors amongst Striga hermonthica (Del.) Benth is the most tenacious, prolific and destructive pests of sorghum. Striga is most abundant and damaging on soils of low fertility and nitrogen is an essential element for reversing this effect. A study was conducted during 2008 (2000/01 E.C.) main crop growing season in Northern Ethiopia to study the productivity response of sorghum to rates of nitrogen application under natural Striga infestation. The experiment was arranged in randomized complete block design with three replications. The experiment consisted of four nitrogen fertilizer levels (0, 50, 100 and 150 kg ha-1). Data on sorghum growth parameters and yield components as well as some Striga growth parameters were recorded at their respective growth stages. Results showed that application of N-fertilizer significantly increased plant height, leaf area index, panicle length, yield per panicle, 1000 grain weight, grain yield, stover yield and harvest index over the control. Highest responses of these parameters were obtained with application of 150 kg N ha-1. Striga plant height, number of branches per plant and Striga plant count/plot were also reduced significantly (p<0.05) with 150 kg N ha-1 application over the control by 9.54, 35.76 and 36.95%, respectively.
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