الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
Two filed experiments were conducted during the summer seasons of 2010 and 2011 in the Experimental Farm at Demo, Faculty of Agriculture, Fayoum University, to evaluate the response of squash (Cucurbita pepo L.) plants (cv. Amjjed hybrid) to application of four rates of ammonium nitrate (33.5% N); 150, 200, 250 and 300 kg fed-1 and/or three concentrations of humic acid (90.3%) as water solution 0.5, 1.0 and 1.5gL-1, besides the untreated as control.
In comparison with zero rate of aqueous solution of humic acid, all other rates significantly increased vegetative growth plant characters (i.e. number of leaves plant-1, stem length, total leaf area plant-1, leaf area leaf-1and also, leaves, stem and canopy dry weight plant-1) as well as fruit yield and its components (i.e. number of fruits plant-1, yield plant-1 and total yield of fruits fed-1) except average of fruit weight. In addition, the concentrations of N, P and K % in leaves were increased, and Na and Cl were decreased. The same results were obtained with all nitrogen fertilizer rates; 200, 250 and 300 kg ammonium nitrate fed-1 as compared to the 150 kg fed-1 rate with some exceptions; P% was not affected and K% was decreased with increasing the rate of nitrogen.
In view of the above mentioned results, it has been concluded that treating squash plant by the water solution of humic acid at the rate of 1.5gL-1, with nitrogen fertilizer at the rate of 250 kg fed-1 could be counteracted the adverse conditions particularly, salinity up to 5000ppm and consequently, profitable yield can be foreseen.