Effect of different amounts of dry organic manure on the growth, productivity and the quality of spring potatoes under the conditions of the coastal area

This study was carried out in the nursery gardens of Tishreen University in the early spring period in 2014, to study the effect of different levels of dry organic manure in the growth and productivity of potato plants (class Spunta), in randomizedcomplete design, study included six treatments: control ( cow organic manure amount of 4 kg/m2) and five treatment with five levels of dry organic manure (100-150-200-250-300 g/m2) .The results showed an increase in stem height, number of stem, foliage area, production and percent of standard tubers by adding dry organic manure at level of 250 g/m2 while Treatment with 300g/m2 contributed an increase of folige area, height of plant and stem number while causing reduced plant production,tuber average weight and production of standard tubers.The result showed also no significant differences between the control and the treatment of 250 g/m2dry organic manure in each of the folige area, production and standard tubers