This study was conducted at the fields Agricultural experiment and Researches station – College of Agriculture – University of Al-Muthana , for autumn and spring season, 2013 – 2014 . The aim of this study was to investigate the effect of potassium fertilization as (K2S04) at four levels added befor sowing .Rates of potassium were 1/4 , 1/2 , 3/4 and 1 from the recommended amount was ( 580 Kg Hec. -1 ) and they are ( quarter , half , three quarter and all the amount of the fertilizers ) which is ( K1 , K2 , K3 and K 4 ) respectively . Foliar application of organic fertilizer with Algaton at three levels 0 , 1 , 2 ml L-1 as (A0 , A1 and A2 ) respectively. The foliar application were conducted at four stages ( 1 – 2 ) weeks after planting , at the beginning of flowering , during the fruit stage and after 2 weeks at the previous spray , Three levels of salicylic acid ( 0 , 2 and 4 mm L-1 ) which were ( S0 , S2 and S4 ) consequently . Applied after one week from the application of organic fertilizers , on the morphological, physiological , yield characters of Cucarbita pepo cv. Ardendo RCBD was adapted with three replications , means were compared using L.S.D at 0.05 level of significant. There was a significant increas in the vegetative characters, plant height , NPK content in leaves , prolein content , fruits number and plant yield . The highest value of these parameter was under the influence of K4 , A2 and S4
Baqer Ch. Hadi Al-Rubaye, Sci. College, Al-Muthanna Univ.
Eiman J. Abdul-Rassol, Agric. College, Baghdad Univ.