The effect of apply levels of nano-nitrogen and urea fertilizer on ammonium availability at horizontal and vertical distance in desert area soil

الملخص EN

A greenhouse experiment was conducted at desert area farm in Al- Zubair district, Basrah government during winter season 2018-2019 to study the effect of applying different levels of urea fertilizer (46% N): 0, 100, 200 and 400 kgN.

ha-1 and nano nitrogen fertilizer (20% N): 0, 50, 100 and 200 kgN.

ha-1 with sequences applied at 30 days' period in soil profile.

Ammonium ion was estimated by Kjeldahl method, the results showed a significant increasing in ammonium availability in soil during growth season for both fertilizers at values 109.22 and 117.66 mg.

kg-1 at march month for urea and nano nitrogen fertilizers respectively.

Also results showed significantly decreased of available ammonium when ever got away horizontally and vertically from centre of applying for both fertilizers and with all adding levels.

Results showed increased of average ammonium in soil received nano nitrogen compared with soil received urea at values 68.56 and 40.30 mg.

kg-1 respectively.