تأثير تغطية التربة و الرش بمستخلصي عرق السوس و الجامكس في محصول الخس (Lactuca sativa L.cv. Paris Island )‎

Abstract EN

The current study was conducted in a private farm at Mosul city in Iraq ,during the growing season 2007- 2008 to investigate the effect of soil mulching with black polyethylene and the foliar application of some natural plant extracts i.

e.

Licorice at concentration (0.0 ,1.5 , and 3.0 gl-1 ) and seaweed extract , Algamix , from the marine algee ( Ascophyllum nodosum ) at concentrations of ( 0.0 ,1.0 ,2.0 ,and 3.0 cm3l-1 ) . Licorice extracts were sprayed at four times (monthly intervals) , while Algamix was sprayed seven times during the experiment ( two weeks intervals ).

The experiment involved 24 treatments arranged in a factorial experiment within split plots in a Randomized Complete Block Design.

Planting methods were considered as the main plots and the interactions between Licorice and seaweeds extracts were arranged in the subplots with three replication for each treatment.

Comparison among means was done by Duncan's multiple test at 5% level to verify the difference between means of treatments.

The results revealed superiority of mulching planting method with foliar spraying of Licorice and Algamix extracts at concentrations of.

3.0 gl-1 , 3.0 cm3 l-1, respectively, was superior significantly in their effects on the vegetative growth i.e.

leaf number , plant length , head circumference and leaf area.

Also, there was a significant effect on the marketable yield and its components of heads folding , average marketable head weight and marketable yield.

While , the percentage of flowering was reduced significantly by application of mulching soil with foliar spraying of Licorice and Algamix.