Effect of potassium application, organic fertilizers and salicylic acid foliar application on growth and yield of summer Squash (Cucurbita pepo L.)

Abstract

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.  

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