Effect of irrigation water salinity and temperature on ammonia volatilization from calcareous soil

الملخص EN

This investigation was done during (January 2020 to July 2020) in the laboratories of the college of agricultural engineering sciences / University of Duhok/Kurdistan Region-Iraq, to study the influence of five differ irrigation water in their salinity (EC= dS m-1) and two temperature degrees (25 and 45)ᵒC on nitrogen volatilization from calcareous soil, using closed chamber techniques.

the irrigated water (W1= 0.70 dS m-1) was natural water from the College well considered as control treatment.

while the others were synthesized from W1 which were W2, W3, W4, and W5, with EC values (1.5, 3.0, 4.5 and 6.0) dS m-1 respectively, using MgCl2 salt.

the soil fertilized with urea 46%N at rate 320KgN ha-1.

the soil characterized with [clayey texture, high pH-value, high CaCO3, low organic matter content, low available nitrogen, with CEC (28.6 Cmolc Kg-1 soil)].

the experiment implemented in randomized complete block design (RCBD), with three replicate.

the averages were compared using adjusted L.S.D.

(p≤ 0.05).

the results show an increasing in the temperature degrees of incubation significantly increased the nitrogen volatilization as ammonia both accumulated and total amount.

increasing in the water salinity levels increased the soil salinity positively, when negatively affected the amount of nitrogen losses through volatilization.

as well as the combined effects of temperature and salinity of the waters found to have significant negative effects on accumulated volatilized ammonia from the soil.

the highest amount of total and accumulated losses of ammonia from the soil obtained from the interaction effect between the highest level of water salinity and the highest incubated temperature degree.

also the results shows that the amount of accumulated volatilized ammonia from the soil with the time under the effect of studied factors increased at the beginning and after a period reached to fixed level, and after that there was no nitrogen volatilization from the soil.