This paper presents the results of researches from SCDA Caracal, regarding the dynamic of ammoniacal nitrogen on chernozem in condition of irrigation function of the method of soil tillage and fertilization. The experiment took place over a period of three years and regarded the following factors: A factor – irrigation, B factor – the method of soil tillage with 3 phases, C factor – nitrogen fertilization on constant fund of phosphorus with 4 phases. The content of ammoniacal nitrogen is presented on the dates it was taken as sample during the vegetation period at 0-20 cm depth. The dates for samples were: November 1, before applying the first dose of nitrogen, December 8, after 30 days from the first dose, April 25 after 30 days from the second dose and July 28 when the plants were mature.   The determinations regarding the dynamic of ammoniacal nitrogen in the soil for wheat culture, highlight important aspects, but also the effect of soil tillage, creating new situations nitrogen supply for the plants. The analyses regarding the content of ammoniacal nitrogen were made in the last year of experiments. Analyzing the content of ammoniacal nitrogen function of the soil tillage, we recorded values almost similar at the sample dates after using different machines. There are differences between the normal plough at 18-23 cm (6.23 ppm N-NH 4 + ) and chisel at the same depth (6.94 ppmN-NH 4 + ) or at 8-10 cm depth (6.46 ppm N-NH 4 + ).

nitrogen doses; wheat culture; fertilization; irrigation; tillage

Presentation: oral