Abstract
This study was carried out at vegetables field of Horticulture and landscape department. College of Agriculture and Forestry. Mosul University. Iraq, during spring season 2010 , to investigate the effect of water stress: two levels of watering were applied, normal irrigation and exposing plants to water stress by no water supply during period of tubers formation and development (46 and 76 days after planting), calcium ion at 200 mg.L-1 concentration and two natural extracts Licorice at 3 g.L-1 and Soluamine at 2 m.L-1 in additional to control, each treatment applied three times ( first applied at full germination stage, while the second and third application were at 20 days and40 days after the first application. All treatments added by three methods of application (foliar application, adding to soil and foliar application + adding to soil). The experiment included 24 treatments which conducted in a Split – plot system within R.C.B.D Design. Each treatment was replicated three times, analysis of variance and Duncan's multiple range test at 0.05 were applied for all research data. Results obtained could be summarized as follows: Exposing potato plants to water stress caused a significant decrease in marketable yield . Application of calcium, Licorice and soluamine increased tuber 's number , plant yield, and marketable yield and reduced the drought damage on yield parameters. Application of calcium and two natural extracts (Licorice and soluamine) to the soil caused a significant increase in tubers weight, plant yield and total yield as compared to foliar application method. Generally, application of Licorice by third method under normal irrigation was the best interaction treatment
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