EFFECT OF NITROGEN SOURCE AND QUANTITY ON YIELD AND ITS QUALITY OF SPINACH

Document Type : Research articles.

Author

Dep. Horticulture. Faculty of Agronomy Dier-Ezzor . Al-Furat University . Syria

Abstract

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.

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