تأثير نوع و كمية السماد الآزوتي علي إنتاجية و نوعية محصول السبانخ

الملخص EN

The research aims to evaluate the influence of nitrogen source (organic : cow manure, different chemical forms : urea, ammonium, sulfate and nitrate, soluble composite) by using the same amount of nitrogen level 150 kg.

N/hectare, and also to investigate the influence of nitrogen fertilizer quantity (0, 100, 150, 200 kg N/ hectare from urea and ammonium sulfate) on the yield and its quality of spinach.

The results indicated a divergent effect of nitrogen source and level.

Urea and cow manure induced a greater productivity and modest accumulation of nitrate and nitrite in leaves .However, medium productivity with the rest of sources but excessive amount of nitrate and nitrite in spinach leaves with ammonium sulfate and nitrate.

The obtained results showed a divergent effect of nitrogen kind and level on yield and its characteristics.

The positive effect of urea in comparison with ammonium nitrate, was reflected as a good productivity with a small amount of nitrate and nitrite .

Results determined the maximal level of fertilizing with nitrogen by 150 kg.

N/hectare for spinach.