The Effect Urea on Nitrification Process in Some Soils of South of Iraq | ||
| Al-Qadisiyah Journal For Agriculture Sciences | ||
| Article 1, Volume 4, Issue 2, December 2014, Pages 106-115 PDF (0 K) | ||
| DOI: 10.33794/qjas.2014.97291 | ||
| Author | ||
| Mohammed Saeed Haran | ||
| Abstract | ||
| The objective of this experiment is to study the effect of different concentrations of urea-N on the amount of the available ammonium remained and that of nitrate formed so that to calculate the nitrification rates directly in the soil. Five concentrations of urea-N (0,75,150,225,300) ppm urea-N are used in a CRD factorial experiment with three replicates. Each treated soil is moistened to 90% of it’s field capacity and incubated at room temperature for forty days started during which the amount of nitrate formed was measured at a 10-day intervals water is added to maintain the moisture by weighing the plates every two days. The following results are recorded:- 1-The results show that was ( 39.8%) of the added nitrogen for the soil taken from Karna, followed by Souq Al-Shiyokh (29.6%), and less than that is registered for the soils taken from Hay and Rafiaee (24.2% and 23.7%) respectively , which is then decreased in the following periods of incubation. 2-Generally the rates of nitrification in soil are proportional to the calcium carbonate and organic matter contents of the soil. | ||
| Keywords | ||
| urea; nitrification; Soils from South of Iraq | ||
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