Elwan, Mohammed W. M.  <br/><br/>
Yield and quality of spinach and parsley affected by nitrogen fertilizer sources and di-potassium hydrogen ortho-phosphate  [electronic resource]. 
 تأثير مصادر السماد النتروجينى وفوسفات البوتاسيوم على محصول وجودة السبانخ والبقدونس. 

 - p.683-698 
<br/><br/>Includes references. 
<br/><br/> Two experiments were carried out during 2011/2012 and 2012/2013 seasons at the Experimental Farm, F.aculty of Agriculture, Suez Canal University, lsmailia, Egypt, to understand the effect of nitrogen forms (ammonium sulfate and urea) and di-potassium hydrogen ortho-phosphate (K2HP04) on yield, nitrate and vitamin C content as well as nitrate reductase activity of spinach and parsley. Pot experiment results revealed that ammonium sulfate-fertilized plants produced significantly higher yield and nitrate content than urea-fertilized plants. K2HP04 improved the yield with less accumulation of nitrate. Lower sodium and calcium were found in K2HP04 fertilized.,spinach plants. Whereas, the results of open field showed that the yield was increased by increasing K2HP04 up to 15 and 20 mM in spinach and parsley, respectively. Previous effect was associated with a significantly lower nitrate and high nitrate reductase activity. K2HP04 at 15 mM gave the highest vitamin C, 112.11 and 253.08 mglOO g-1 FW for spinach and parsley, respectively. The higher nitrate reductase activity was associated with lower nitrate (r = -0.87) in plants-treated with K2HP04• It could be concluded that, supplementation ofK2HP04 could reduce the leafN03- concentration to safety levels for consumption in both spinach and parsley. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spinach--Fertilizers.<br/>Parsley--Fertilizers<br/>Parsley--Quality<br/>Parsley--Yields.<br/>Spinach--Yields<br/>Spinach--Quality<br/>Potassium fertilizers<br/>Nitrogen fertilizers
<br/><br/><label>Subjects--Index Terms: </label>sodium dihydrogen orthophosphate